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Sample records for cinnabar

  1. In vitro investigation on cinnabar dissolution

    Institute of Scientific and Technical Information of China (English)

    ZENG Kewu; WANG Qi; YANG Xiaoda; WANG Kui

    2007-01-01

    To study the effects of different chemical factors in the gastrointestinal tract, I.e. pH, proteins, amino acids,ionic strength and Na2S, on the dissolution of cinnabar. The content of the total mercury in various dissolutions of cinnabar was analyzed by UV/VIS Spectrophotometer. Laser Particle Size Analyzer measured the particle distributionsin the dissolution of cinnabar. The chemical species of dis-solved substance of cinnabar in the presence of Na2S were determined using ESI-MS. The results indicate that the solu-bility of cinnabar could be increased significantly in the pres-ence ofNa2S/S0, and strong acidic pH, respectively. While theinfluence of thiol amino acid on promoting dissolutionremains relatively low. Cinnabar did not dissolve in the form of nanoparticle. It is postulated that cinnabar could be dissolved in the gastrointestinal tract in various forms of sulfur-containing mercury complexes.

  2. Cinnabar Induces Renal Inflammation and Fibrogenesis in Rats

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    Ying Wang

    2015-01-01

    Full Text Available The purpose of this study was to investigate whether cinnabar causes renal inflammation and fibrosis in rats. Rats were dosed orally with cinnabar (1 g/kg/day for 8 weeks or 12 weeks. The control rats were treated with solvent (5% carboxymethylcellulose solution over the same time periods, respectively. Renal mercury (RHg, urinary mercury (UHg, serum creatinine (SCr, urine kidney injury molecule 1 (KIM-1, renal pathology, and renal mediators were examined. At both 8 weeks and 12 weeks, RHg, UHg, and urine KIM-1 were significantly higher in the cinnabar group than in the control group, although SCr was unchanged. Kidney lesions in the cinnabar-treated rats occurred mainly in the tubules and interstitium, including vacuolization, protein casts, infiltration of inflammatory cells, and slight increase in interstitial collagen. In addition, mild mesangial proliferation was observed in glomeruli. Moreover, the expression of inflammatory and fibrogenic mediators was upregulated in the cinnabar group. In conclusion, cinnabar may cause kidney damage due to the accumulation of mercury, and renal inflammation and slight fibrogenesis may occur in rats. In the clinic, the potential risk of renal injury due to the prolonged consumption of cinnabar should be considered even though the agent is relatively nontoxic.

  3. Cinnabar alteration in archaeological wall paintings: an experimental and theoretical approach

    Science.gov (United States)

    Neiman, Madeleine Kegelman; Balonis, Magdalena; Kakoulli, Ioanna

    2015-11-01

    The red mineral pigment known as cinnabar (HgS) was commonly employed in Roman fresco wall paintings. Fresco artists of the period favored this pigment for its striking red color. However, upon excavation and exposure to air and light, cinnabar-pigmented surfaces recovered from archaeological contexts often proved to be unstable. Mural paintings colored with cinnabar that have been exposed in the open air frequently demonstrate a disfiguring, irreversible darkening of the surface. Traditionally, scholars have attributed this alteration to a light-induced phase change from red α-cinnabar to black β-cinnabar (meta-cinnabar). While this transformation has not been totally excluded, the prevailing view among conservation scientists is that chlorine plays a key role in the darkening process through the formation of light-sensitive mercury chloride compounds, or as a catalyst in the photochemical redox of Hg(II)S into Hg(0) and S(0). Using laboratory-based experiments and thermodynamic modeling, this paper attempts to further clarify the mechanism(s) and kinetics of cinnabar alteration in fresco applications, especially the role of light, humidity, and chlorine ions. Additionally, it explores possible pathways and preventive as well as remedial conservation treatments during or immediately following excavation, to inhibit or retard darkening of cinnabar-pigmented fresco surfaces.

  4. Phase Transition and EOS of Cinnabar (α-HgS) at High Pressure and High Temperature

    Institute of Scientific and Technical Information of China (English)

    FAN Da-Wei; ZHOU Wen-Ge; LIU Cong-Qiang; WAN Fang; XING Yin-Suo; LIU Jing; LI Yan-Chun; XIE Hong-Sen

    2009-01-01

    @@ Phase relations and equation of state (EOS) of natural cinnabar (α-HgS) are investigated by high-pressure and high-temperature synchrotron x-ray powder diffraction. The unambiguous cinnabar-rocksalt structure phase boundaries are determined to be Plower(Gpa)=15.54-0.014T(℃) and Pupper(Gpa)= 23.84 - 0.014T(℃) at 300--623K. With K' axed at 4, we obtain K0 = 37(4) Gpa, ( K/ T)p=-0.025(2) GPaK-1, and α0= 3.79(20)× 10-5 K-1 for the cinnabar phase of α-HgS. The ( K/ T)p and α0 of cinnabar phase are obtained for the first time. A nearly isotropic compression of cinnabar phase is observed by linear regressions.

  5. Evaluating the role of re-adsorption of dissolved Hg(2+) during cinnabar dissolution using isotope tracer technique.

    Science.gov (United States)

    Jiang, Ping; Li, Yanbin; Liu, Guangliang; Yang, Guidi; Lagos, Leonel; Yin, Yongguang; Gu, Baohua; Jiang, Guibin; Cai, Yong

    2016-11-05

    Cinnabar dissolution is an important factor controlling mercury (Hg) cycling. Recent studies have suggested the co-occurrence of re-adsorption of the released Hg during the course of cinnabar dissolution. However, there is a lack of feasible techniques that can quantitatively assess the amount of Hg re-adsorbed on cinnabar when investigating cinnabar dissolution. In this study, a new method, based on isotope tracing and dilution techniques, was developed to study the role of Hg re-adsorption in cinnabar dissolution. The developed method includes two key components: (1) accurate measurement of both released and spiked Hg in aqueous phase and (2) estimation of re-adsorbed Hg on cinnabar surface via the reduction in spiked (202)Hg(2+). By adopting the developed method, it was found that the released Hg for trials purged with oxygen could reach several hundred μgL(-1), while no significant cinnabar dissolution was detected under anaerobic condition. Cinnabar dissolution rate when considering Hg re-adsorption was approximately 2 times the value calculated solely with the Hg detected in the aqueous phase. These results suggest that ignoring the Hg re-adsorption process can significantly underestimate the importance of cinnabar dissolution, highlighting the necessity of applying the developed method in future cinnabar dissolution studies.

  6. Cinnabar-Induced Subchronic Renal Injury Is Associated with Increased Apoptosis in Rats

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    Ying Wang

    2015-01-01

    Full Text Available The aim of this study was to explore the role of apoptosis in cinnabar-induced renal injury in rats. To test this role, rats were dosed orally with cinnabar (1 g/kg/day for 8 weeks or 12 weeks, and the control rats were treated with 5% carboxymethylcellulose solution. Levels of urinary mercury (UHg, renal mercury (RHg, serum creatinine (SCr, and urine kidney injury molecule 1 (KIM-1 were assessed, and renal pathology was analyzed. Apoptotic cells were identified and the apoptotic index was calculated. A rat antibody array was used to analyze expression of cytokines associated with apoptosis. Results from these analyses showed that UHg, RHg, and urine KIM-1, but not SCr, levels were significantly increased in cinnabar-treated rats. Renal pathological changes in cinnabar-treated rats included vacuolization of tubular cells, formation of protein casts, infiltration of inflammatory cells, and increase in the number of apoptotic tubular cells. In comparison to the control group, expression of FasL, Fas, TNF-α, TRAIL, activin A, and adiponectin was upregulated in the cinnabar-treated group. Collectively, our results suggest that prolonged use of cinnabar results in kidney damage due to accumulation of mercury and that the underlying mechanism involves apoptosis of tubular cells via a death receptor-mediated pathway.

  7. Quality Study on Cinnabar-analysis of Dyeing Status for Cinnabar%朱砂染色现状分析

    Institute of Scientific and Technical Information of China (English)

    邢潇; 刘治民; 徐彤彤; 谷妲; 梁玉冰; 张鑫; 杨建龙

    2016-01-01

    目的:分析朱砂药材及饮片染色现状,为朱砂药材及饮片的品质和临床安全应用提供参考依据。方法:采用薄层色谱法(TLC)对药材和饮片中苋菜红、胭脂红、赤藓红、酸性红73、808猩红、靛玉红进行定性鉴别。采用高效液相色谱-质谱联用法(HPLC-MS)检测药材及饮片中的808猩红。HPLC条件:色谱柱为Acquity UPLC BEH C18,流动相为乙腈-0.1%甲酸(70∶30,V/V),流速为0.3 ml/min,检测波长为520 nm;MS条件:离子源为电喷雾离子源,扫描方式为正离子扫描,检测方式为全扫描二级质谱,雾化器压力为30 psi,干燥气为氮气,离子喷雾电压为4000 V,碰撞能为30 V,进样量为5μl。采用容量法测定药材及饮片中硫化汞(HgS)的含量。结果:苋菜红、胭脂红、赤藓红、酸性红73、808猩红、靛玉红的TLC斑点清晰,分离良好。18批样品中有4批808猩红染色,有6批HgS含量不达标(其中3批同时为808猩红染色)。结论:目前市场中流通的朱砂药材及饮片存在染色掺杂和HgS含量不达标等质量问题,应引起重视。%OBJECTIVE:To analyze the dyeing status of cinnabar and its pieces,and provide reference for its quality clinical safetey appicaton. METHODS:TLC was used for the qualitative identification of amaranth,carmine,erythrosine,acid red 73, 808 udan and indirubin. HPLC-MS was used to detect the 808 udan :HPLC conditions were as follows,column was Acquity UPLC BEH C18 with mobile phase of cetonitrile-0.1% formic acid(70∶30,V/V)at a flow rate of 0.3 ml/min,the detection wave-length was 520 nm;MS conditions were as follows,ion source was electrospray ionization source,scanning mode was positive ion scanning with full scanning tandem mass spectrometry,nebulizer pressure was 30 psi,drying gas was nitrogen,ion spray voltage was 4 000 V,collision energy was 30 V,and the injection volume was 5 μl. The volumetric method was used

  8. [Dissolution, absorption and bioaccumulation in gastrointestinal tract of mercury in HgS-containing traditional medicines Cinnabar and Zuotai].

    Science.gov (United States)

    Zheng, Zhi-yuan; Li, Cen; Zhang, Ming; Yang, Hong-xia; Geng, Lu-jing; Li, Lin-shuai; Du, Yu-zhi; Wei, Li-xin

    2015-06-01

    α-HgS is the main component of traditional Chinese medicine cinnabar, while β-HgS is the main component of Tibetan medicine Zuotai. However, there was no comparative study on the dissolution and absorption in gastrointestinal tract and bioaccumulation in organs of mercury in Cinnabar, Zuotai, α-HgS and β-HgS. In this study, the dissolution process of the four compounds in the human gastrointestinal tract was simulated to determine the mercury dissolutions and compare the mercury dissolution of different medicines and the dissolution-promoting capacity of different solutions. To explore the absorption and bioaccumulation of cinnabar and Zuotai in organisms, mice were orally administered with clinical equivalent doses cinnabar and Zuotai. Meanwhile, a group of mice was given α-HgS and β-HgS with the equivalent mercury with cinnabar, while another group was given β-HgS and HgCl2 with the equivalent mercury with Zuotai. The mercury absorption and bioaccumulation capacities of different medicines in mice and their mercury bioaccumulation in different tissues and organs were compared. The experimental results showed a high mercury dissolutions of Zuotai in artificial gastrointestinal fluid, which was followed by β-HgS, cinnabar and α-HgS. As for the mercury absorption and bioaccumulation in mice, HgCl2 was the highest, β-HgS was the next, and a-HgS was slightly higher than cinnabar. The organs with the mercury bioaccumulation from high to low were kidney, liver and brain. This study is close to clinical practices and can provide reference for the clinical safe medication as well as a study model for the safety evaluation on heavy metal-containing medicines by observing the mercury dissolution, absorption, distribution and accumulation of mercury-containing medicines cinnabar and zuotai.

  9. Chronic mercury exposure in Late Neolithic/Chalcolithic populations in Portugal from the cultural use of cinnabar

    Science.gov (United States)

    Emslie, Steven D.; Brasso, Rebecka; Patterson, William P.; Carlos Valera, António; McKenzie, Ashley; Maria Silva, Ana; Gleason, James D.; Blum, Joel D.

    2015-10-01

    Cinnabar is a natural mercury sulfide (HgS) mineral of volcanic or hydrothermal origin that is found worldwide. It has been mined prehistorically and historically in China, Japan, Europe, and the Americas to extract metallic mercury (Hg0) for use in metallurgy, as a medicinal, a preservative, and as a red pigment for body paint and ceramics. Processing cinnabar via combustion releases Hg0 vapor that can be toxic if inhaled. Mercury from cinnabar can also be absorbed through the gut and skin, where it can accumulate in organs and bone. Here, we report moderate to high levels of total mercury (THg) in human bone from three Late Neolithic/Chalcolithic (5400-4100 B.P.) sites in southern Portugal that were likely caused by cultural use of cinnabar. We use light stable isotope and Hg stable isotope tracking to test three hypotheses on the origin of mercury in this prehistoric human bone. We traced Hg in two individuals to cinnabar deposits near Almadén, Spain, and conclude that use of this mineral likely caused mild to severe mercury poisoning in the prehistoric population. Our methods have applications to bioarchaeological investigations worldwide, and for tracking trade routes and mobility of prehistoric populations where cinnabar use is documented.

  10. Bacterial Influence on the Solubility of Cinnabar and Metacinnabar at New Idria, CA

    Science.gov (United States)

    Jew, A. D.; Rytuba, J. J.; Spormann, A. M.; Brown, G. E.

    2007-12-01

    Mercury in the forms of cinnabar (α-HgS) and metacinnabar (β-HgS) is generally considered to be unreactive and of little environmental concern. To determine if this current belief is valid, a consortium of bacteria (including a Thiomonas intermedia-like bacterium) was taken from the acid mine drainage (AMD) pond at the New Idria Hg Mine, San Benito Co., CA, and inoculated into filter-sterilized AMD pond water (pH = 4) containing either ground cinnabar or metacinnabar crystals (Minteq with AMD pond water chemistry determined by ICP-MS and total mercury and total sulfide analyses. These calculations give an equilibrium solubility product for the dissolution of HgS up to 25 orders of magnitude higher than HgS under standard conditions. When compared to calculations by Paquette et al., 1997 and Benoit et al., 1999, the bacterial consortium at New Idria causes an increase in the pK for all reported reactions including H+, HS-, and H2S of 11-13 orders of magnitude. These results indicate that the biofilm consortium at the New Idria AMD pond has a profound effect on the solubility of cinnabar and metacinnabar, suggesting that a reassessment of HgS stability in aerobic AMD environments is needed.

  11. Exposure to Low Dose of Cinnabar (a Naturally Occurring Mercuric Sulfide (HgS Caused Neurotoxicological Effects in Offspring Mice

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    Chun-Fa Huang

    2012-01-01

    Full Text Available Cinnabar, a naturally occurring mercuric sulfide (HgS, has long been used in Chinese mineral medicine for more than 2000 years. Although mercury is well-known for its toxicity, whether cinnabar induces neurotoxicity, especially in infants and children, is unknown. The purpose of this study was to explore the neurotoxic effects of low-dose of cinnabar (10 mg/kg/day on developing mice. The results revealed neurobehavioral defects in F1-C-Cin group, which were associated with Hg accumulation, increased NOx levels in whole blood, and Na+/K+-ATPase activities in brain tissues. F1- and F2-Cin-V groups were found to increase brain Hg contents and prominent neurobehavioral defects compared with F1-C-V group, suggesting that the fetal brain was more susceptible to irreversible effects for cinnabar-induced damage. Moreover, F1- and F2-Cin-Cin groups had severely neurobehavioral dysfunctions, closely correlated with the further alteration of NOx levels and Na+/K+-ATPase activities than F1- and F2-C-Cin groups. Effects in F2-Cin-Cin group were more significant than those in F1-Cin-Cin group. In conclusion, this study demonstrates that exposure to low-dose of cinnabar during the perinatal and developmental stages results in irreversible and severe injuries of the neurotoxicity in offspring, and NOx and Na+/K+-ATPase activities may exist potential and useful biomarkers for neurotoxicity-induced by low-doses of mercuric compounds.

  12. Cinnabar, arsenian pyrite and thallium-enrichment in active shallow submarine hydrothermal vents at Paleochori Bay, Milos Island, Greece

    Science.gov (United States)

    Kati, Marianna; Voudouris, Panagiotis; Valsami-Jones, Eugenia; Magganas, Andreas; Baltatzis, Emmanouil; Kanellopoulos, Christos; Mavrogonatos, Constantinos

    2015-04-01

    We herein report the discovery of active cinnabar-depositing hydrothermal vents in a submarine setting at Paleochori Bay, within the offshore southeastern extension of the Milos Island Geothermal Field, South Aegean Active Volcanic Arc. Active, low temperature (up to 115 °C) hydrothermal venting through volcaniclastic material has led to a varied assemblage of sulfide and alteration mineral phases in an area of approximately 1 km2. Our samples recovered from Paleochori Bay are hydrothermal edifices composed of volcaniclastic detrital material cemented by pyrite, or pure sulfide (mainly massive pyrite) mounts. Besides pyrite and minor marcasite, the hydrothermal minerals include cinnabar, amorphous silica, hydrous ferric oxides, carbonates (aragonite and calcite), alunite-jarosite solid solution and Sr-rich barite. Among others, growth textures, sieve-textured pyrite associated with barite, alunite-jarosite solid solution and hydrous ferric oxides rims colloform-banded pyrite layers. Overgrowths of arsenian pyrite layers (up to 3.2 wt. % As and/or up to 1.1 wt. % Mn) onto As-free pyrite indicate fluctuation in As content of the hydrothermal fluid. Mercury, in the form of cinnabar, occurs in up to 5 μm grains within arsenian pyrite layers, usually forming distinct cinnabar-enriched micro-layers. Hydrothermal Sr-rich barite (barite-celestine solid solution), pseudocubic alunite-jarosite solid solution and Mn- and Sr-enriched carbonates occur in various amounts and closely associated with pyrite and/or hydrous ferric oxides. Thallium-bearing sulfides and/or sulfosalts were not detected during our study; however, hydrous ferric oxides show thallium content of up to 0.5 wt. % Tl. The following scenarios may have played a role in pyrite precipitation at Paleochori: (a) H2S originally dissolved in the deep fluid but separated upon boiling could have reacted with oxygenated seawater under production of sulphuric acid, thus causing leaching and dissolution of primary iron

  13. Mercury emission and dispersion models from soils contaminated by cinnabar mining and metallurgy.

    Science.gov (United States)

    Llanos, Willians; Kocman, David; Higueras, Pablo; Horvat, Milena

    2011-12-01

    The laboratory flux measurement system (LFMS) and dispersion models were used to investigate the kinetics of mercury emission flux (MEF) from contaminated soils. Representative soil samples with respect to total Hg concentration (26-9770 μg g(-1)) surrounding a decommissioned mercury-mining area (Las Cuevas Mine), and a former mercury smelter (Cerco Metalúrgico de Almadenejos), in the Almadén mercury mining district (South Central Spain), were collected. Altogether, 14 samples were analyzed to determine the variation in mercury emission flux (MEF) versus distance from the sources, regulating two major environmental parameters comprising soil temperature and solar radiation. In addition, the fraction of the water-soluble mercury in these samples was determined in order to assess how MEF from soil is related to the mercury in the aqueous soil phase. Measured MEFs ranged from less than 140 to over 10,000 ng m(-2) h(-1), with the highest emissions from contaminated soils adjacent to point sources. A significant decrease of MEF was then observed with increasing distance from these sites. Strong positive effects of both temperature and solar radiation on MEF was observed. Moreover, MEF was found to occur more easily in soils with higher proportions of soluble mercury compared to soils where cinnabar prevails. Based on the calculated Hg emission rates and with the support of geographical information system (GIS) tools and ISC AERMOD software, dispersion models for atmospheric mercury were implemented. In this way, the gaseous mercury plume generated by the soil-originated emissions at different seasons was modeled. Modeling efforts revealed that much higher emissions and larger mercury plumes are generated in dry and warm periods (summer), while the plume is smaller and associated with lower concentrations of atmospheric mercury during colder periods with higher wind activity (fall). Based on the calculated emissions and the model implementation, yearly emissions from

  14. Sulfur isotope analysis of cinnabar from Roman wall paintings by elemental analysis/isotope ratio mass spectrometry--tracking the origin of archaeological red pigments and their authenticity.

    Science.gov (United States)

    Spangenberg, Jorge E; Lavric, Jost V; Meisser, Nicolas; Serneels, Vincent

    2010-10-15

    The most valuable pigment of the Roman wall paintings was the red color obtained from powdered cinnabar (Minium Cinnabaris pigment), the red mercury sulfide (HgS), which was brought from mercury (Hg) deposits in the Roman Empire. To address the question of whether sulfur isotope signatures can serve as a rapid method to establish the provenance of the red pigment in Roman frescoes, we have measured the sulfur isotope composition (δ(34)S value in ‰ VCDT) in samples of wall painting from the Roman city Aventicum (Avenches, Vaud, Switzerland) and compared them with values from cinnabar from European mercury deposits (Almadén in Spain, Idria in Slovenia, Monte Amiata in Italy, Moschellandsberg in Germany, and Genepy in France). Our study shows that the δ(34)S values of cinnabar from the studied Roman wall paintings fall within or near to the composition of Almadén cinnabar; thus, the provenance of the raw material may be deduced. This approach may provide information on provenance and authenticity in archaeological, restoration and forensic studies of Roman and Greek frescoes.

  15. Cinnabar and realgar in traditional chinese medicines:remedies or poisons?%含朱砂、雄黄的中成药,是药还是毒?

    Institute of Scientific and Technical Information of China (English)

    刘杰; 陆远富; 时京珍; 张锋; 吴芹

    2011-01-01

    朱砂(96% HgS)和雄黄(90% As4S4)与其它中药配伍应用于临床已有上千年历史.但由于朱砂含汞,雄黄含砷,其安全性近年来引起了越来越多的关注.一般认为把已知的金属毒物用于医药中不可取,但也有不同的意见认为朱砂和雄黄有长期用药历史,临床有效,其毒副作用可耐受.含朱砂、雄黄的中药是药还是毒?本文就含朱砂和雄黄的中成药的研究进展作一综述,并提出(1)以总砷和总汞为标准进行评价含朱砂、雄黄中药的安全性不妥,(2)朱砂和雄黄的用药量和用药时间决定其毒性反应,(3)朱砂和雄黄是中药复方中的有效成分之一,应作深入研究来决定其取舍.%Cinnabar( 96 % of HgS)and realgar( 90 % of As4S4)have been used in traditional Chinese medicines for thousands of years.Both mercury ( Hg) and arsenic ( As)are well-known toxic substances and the safety of cinnabar-and realgar-containing traditional Chinese medicines is of concern.It is presumed that any intentional use of known toxic metals in medicine is an unacceptable risk,hut an opposing opinion holds that cinnabar and realgar have a long history of clear pharmacological utility with tolerable side effects.Are cinnabar-and/or realgar-containing Chinese medicines remedies or poisons? This chapter summarizes recent progress of toxicological and pharmacological studies on this issue and highlights that( 1 ) the use of total Hg and As for risk evaluation of cinnabar and realgar is inappropriate,(2) the right dose and duration of cinnabar and realer administration differentiate a remedy from a poison,and( 3 )cinnabar and realgar are active ingredients in Chinese medicines.The well-designed studies are needed to support or to reject their existence in traditional remedies.

  16. The pseudo-binary mercury chalcogenide alloy HgSe sub 0 sub . sub 7 S sub 0 sub . sub 3 at high pressure: a mechanism for the zinc blende to cinnabar reconstructive phase transition

    CERN Document Server

    Kozlenko, D P; Ehm, L; Hull, S; Savenko, B N; Shchennikov, V V; Voronin, V I

    2003-01-01

    The structure of the pseudo-binary mercury chalcogenide alloy HgSe sub 0 sub . sub 7 S sub 0 sub . sub 3 has been studied by x-ray and neutron powder diffraction at pressures up to 8.5 GPa. A phase transition from the cubic zinc blende structure to the hexagonal cinnabar structure was observed at P approx 1 GPa. A phenomenological model of this reconstructive phase transition based on a displacement mechanism is proposed. Analysis of the geometrical relationship between the zinc blende and the cinnabar phases has shown that the possible order parameter for the zinc blende-cinnabar structural transformation is the spontaneous strain e sub 4. This assignment agrees with the previously observed high pressure behaviour of the elastic constants of some mercury chalcogenides.

  17. Cytotoxicity of Cinnabar and Cinnabar-containing Compounds in Human Liver HL-7702 Cells%朱砂、含朱砂复方对人肝细胞的毒性对比研究

    Institute of Scientific and Technical Information of China (English)

    付中祥; 时京珍; 刘杰; 张永萍

    2013-01-01

    Objective:To study the toxicity of cinnabr,Zhusha Anshen Wan,Liaoyuan Hetang Huafeng Dan,Wansheng Huafeng Dan,HgS,HgC12 and MeHg in human liver HL-7702 cells.Method:Cultured cells were treated with cinnabar containing compounds and mercurial for 24 h,and was determined by the MTS assay,extracellular and intracellular Hg contents were determined by atomic fluoresence detector.Result:The cytotoxicity of cinnabr,Zhusha Anshen Wan,Liaoyuan Hetang Huafeng Dan,Wansheng Huafeng Dan,HgS had a obvious difference compared with HgCl2 and MeHg is same as the intracellular and extracellular mercury accumulation.Conclusion:The toxicity of cinnabr,Zhusha Anshen Wan,Liaoyuan Hetang Huafeng Dan,Wansheng Huafeng Dan,HgS with same mercury accumulation and same mercury dissolution is extremely lower than the corresponding HgCl2 and MeHg in human liver HL-7702 cells.%目的:对比研究朱砂、几种含朱砂复方与其他汞存在形式对HL-7702人肝细胞的毒性.方法:分别以朱砂、朱砂安神丸、廖元和堂化风丹、万胜化风丹、硫化汞、氯化汞、甲基汞加入已接种于96孔板的HL-7702人肝细胞后,检测各组的细胞存活率、检测各组细胞内、外的汞含量.结果:等汞含量和等汞浸出量的朱砂、朱砂安神丸、廖元和堂化风丹、万胜化风丹和硫化汞对HL-7702人肝细胞的存活率与正常组无明显差异,与等汞含量和等汞浸出量的氯化汞和甲基汞均有明显差异(P<0.05);分别以等汞含量、等汞浸出量的朱砂、朱砂安神丸、廖元和堂化风丹、万胜化风丹和硫化汞培养的HL-7702人肝细胞内、外汞含量均低于氯化汞、甲基汞(P<0.05).结论:等汞含量、等汞浸出量的朱砂、朱砂安神丸、廖元和堂化风丹和万胜化风丹对人肝HL-7702细胞的毒性远小于对应等汞含量、等汞浸出量的氯化汞、甲基汞.

  18. Experimental Study on the Use of Cinnabar During Pregnancy%朱砂妊娠用药的实验研究

    Institute of Scientific and Technical Information of China (English)

    陈斌; 肖敏; 李飞艳; 冯传平; 李辉; 刘杰

    2013-01-01

      目的:比较孕兔、幼兔、成年兔和新生兔(实验中孕兔所产)血汞含量,探讨不同兔对朱砂中汞的吸收情况。方法:用朱砂定时定量灌胃,用吹气富集-冷原子吸收法测定孕兔、幼兔、成年兔和新生兔血汞含量,并对实验数据进行统计学分析与比较。结果:血汞浓度:孕兔>幼兔>成年兔;新生兔血汞浓度显著高于孕兔给药前的血汞浓度。结论:实验表明朱砂中汞能透过孕兔胎盘屏障进入新生兔体内。鉴于汞的巨大毒性,提出《中国药典》在中药妊娠禁忌药中应增列朱砂。%Objectives: To investigate the absorption of the mercury in Cinnabarr by different rabbits, the blood mercury concentrations in pregnant rabbits, young rabbits, adult rabbits and newborn rabbits (the neonatal of the pregnant rabbits used in the experiment) were compared. Methods: The rabbits were given Cinnabar by intragastric administration quantitatively at regular intervals. The blood mercury concentrations in the pregnant rabbits, young rabbits, adult rabbits and newborn rabbits were measured by cold vapour atomic absorption spectrometry, and the experiment data has been analyzed. Results: Blood mercury concentrations were in the series as follows: pregnant rabbits > young rabbits > adult rabbits; The newborn rabbits had significantly higher blood mercury concentrations than that of adult rabbits. Conclusions: Experimental results indicated that the mercury in Cinnabar could through the placental barrier of pregnant rabbits to pass into the fetal rabbit. Considering the severe toxicity of mercury, Cinnabar should be added to the list of the contraindicated traditional Chinese medicines during pregnancy in Chinese Pharmacopoeia.

  19. Bioaccessibility as well as absorption and excretion of mercury in cinnabar%朱砂中汞的生物可接受性及其吸收与排泄

    Institute of Scientific and Technical Information of China (English)

    霍韬光; 王海宇; 林欣然; 畅蓓; 李维凯; 杨卉蕾; 张颖花; 姜泓

    2012-01-01

    研究了朱砂中汞的生物可接受性及其在体内的吸收与排泄.采用体外消化透析法测定了朱砂中汞的生物可按受性;计算了大鼠灌胃给予临床剂量(50 mg/kg)朱砂后汞的药动学参数;测定了给予临床剂量的朱砂后大鼠粪样中汞的排泄量.结果表明,朱砂中汞的溶出率为0.011%,生物可接受率为0.003 3%.大鼠灌胃给予临床剂量的朱砂后,汞的药动学参数为:最高血药浓度(Pmax)为(6.3±1.3)μg/L,达峰时间(tmax)为(1.3±0.4)h,半衰期(t1/2)为(4.2±0.5)h,血药浓度-时间曲线下面积(AUC)为(54.7±8.7) μg·h·L-1.给予朱砂12 h后汞在粪便中排泄量最大,96 h后在粪样中仍可检测到少量汞.朱砂中汞的生物可接受性较低,在体内吸收少,滞留时间较长,排泄缓慢,长期服用可在体内蓄积,产生毒性.%The bioaccessibility and absorption and excretion of mercury in cinnabar were studied. The bioaccessibility of mercury in cinnabar was evaluated by adopting in vitro digestion and dialysis method to simulate the conditions of gastric compartment and intestinal compartment of mercury. The pharmacokinetic parameters of mercury with respect to intragastric administration of cinnabar at a clinical dosage of 50 mg/kg for rats were calculated) and the excretion fraction of mercury in the fecal sample of the rats after intragastric administration of cinnabar at a clinical dosage was determined. Results indicate that, in the gastric compartment, the solubility of mercury from cinnabar is 0. 011%; and the bioaccessibility of mercury in the intestinal compartment is 0. 003 3%. The time-course pharmacokinetic parameters of mercury when the rats are intragastrically given cinnabar at a clinical dosage of 50 mg/kg are determined as the maximum concentration in blood Cmax(6.3 ± 1.3) μg/L, time to reach the maximum concentration tmax(l. 3 ± 0. 4) h, half-time period t1/2(4. 2 ± 0. 5) h, and area under the concentration-time curve AUC (54. 7

  20. 朱砂对雄性大鼠精子质量影响的研究%Effect of cinnabar on sperm quality of male rats

    Institute of Scientific and Technical Information of China (English)

    顾祖曦; 刘炯; 谷颖敏; 姜昕; 吴文斌; 米金霞; 汤家铭

    2012-01-01

    Objective To observe the effect of cinnabar on the sperm motility and related movement parameters of male rats. Methods The male rats of reproductive toxicity section I were randomized into four groups; negative control group (0.5% CMC-Na) , small close cinnabar group (100 (xg/g) , medium dose group (300 μg/g) , large dose group (1 000 μg/g) and positive group (tripterygium glycosides 10 μg/g) , corresponding interventions were given in each group with the course of 6 weeks. After administration, the epididymis of each rat was taken to prepare sperm suspensions, then transfer 10 ui of rat sperm suspensions to sperm counting chambers to examine the quantity, vitality, motility of sperm by computer assisted sperm analysis ( CASA). Histo-pathological examination of testes and epididymis was done by HE staining. Results Compared with negative control group, the living rate, vitality, effective quantity and density of sperm in three cinnabar groups were decreases, with significant differences in living rate, vitality and density of sperm between negative control group and medium dose group, and with significant difference in effective quantity of sperm between negative control group and small dose group (P 0.05). Conclusion Cinnabar has negative effect on vitality, living rate, density and motility of rats sperm, and the results prompt that long term administration of cinnabar may had some harmful effect on male fertility.%目的 观察朱砂灌胃给药对雄性大鼠精子活力及相关运动参数的影响.方法 利用生殖毒性Ⅰ段雄性大鼠,按体质量随机分为阴性对照组(0.5% CMC-Na)、朱砂低剂量组(100μg∥g)、朱砂中剂量组(300 μg/g)、朱砂高剂量组(1 000ug/g)、阳性对照组(雷公藤多苷10 μg/g),分别给予相应的干预措施,共6周.给药结束后,取大鼠一侧附睾制备精子悬液,吸取10μl精子悬液至大鼠专用精子计数池,用计算机辅助精子分析系统(CASA)进行精子数量、活

  1. Arsenic and Mercury Containing Traditional Chinese Medicine (Realgar and Cinnabar Strongly Inhibit Organic Anion Transporters, Oat1 and Oat3, In Vivo in Mice

    Directory of Open Access Journals (Sweden)

    Wen-Hao Yu

    2015-01-01

    Full Text Available Toxic heavy metals, including mercury (Hg and arsenic (As, accumulate preferentially in kidneys and always cause acute renal failure. The aim of this study was to investigate whether these samples affect organic anion transporters, Oat1 and Oat3, in vivo in mice kidney. Mice (n=10 were orally treated with investigational samples. After last administration, all mice were i.v. p-aminohippuric acid (PAH, and the blood and kidneys samples were collected. The concentrations of PAH were quantified by spectrophotometry. mRNA expressions of Oat1 and Oat3 were assayed by real-time PCR. In comparison with corresponding control, major pharmacokinetic parameters of PAH in sera were significantly changed by investigational samples (p<0.05, PAH accumulations in the kidney tissues were significantly higher (p<0.05, PAH uptake by renal slices was greatly reduced, Oat1 and Oat3 mRNA expression were significantly inhibited in investigational sample groups. Arsenic and mercury containing traditional Chinese medicine (Realgar and Cinnabar probably induce kidney damage through inhibiting several members of the organic anion transporters (such as OAT1 and OAT3.

  2. Mercury analysis of acid- and alkaline-reduced biological samples: identification of meta-cinnabar as the major biotransformed compound in algae.

    Science.gov (United States)

    Kelly, David; Budd, Kenneth; Lefebvre, Daniel D

    2006-01-01

    The biotransformation of Hg(II) in pH-controlled and aerated algal cultures was investigated. Previous researchers have observed losses in Hg detection in vitro with the addition of cysteine under acid reduction conditions in the presence of SnCl2. They proposed that this was the effect of Hg-thiol complexing. The present study found that cysteine-Hg, protein and nonprotein thiol chelates, and nucleoside chelates of Hg were all fully detectable under acid reduction conditions without previous digestion. Furthermore, organic (R-Hg) mercury compounds could not be detected under either the acid or alkaline reduction conditions, and only beta-HgS was detected under alkaline and not under acid SnCl2 reduction conditions. The blue-green alga Limnothrix planctonica biotransformed the bulk of Hg(II) applied as HgCl2 into a form with the analytical properties of beta-HgS. Similar results were obtained for the eukaryotic alga Selenastrum minutum. No evidence for the synthesis of organomercurials such as CH3Hg+ was obtained from analysis of either airstream or biomass samples under the aerobic conditions of the study. An analytical procedure that involved both acid and alkaline reduction was developed. It provides the first selective method for the determination of beta-HgS in biological samples. Under aerobic conditions, Hg(II) is biotransformed mainly into beta-HgS (meta-cinnabar), and this occurs in both prokaryotic and eukaryotic algae. This has important implications with respect to identification of mercury species and cycling in aquatic habitats.

  3. Comparison and Research of Cinnabar, Zhusha Anshen Wan and HgS on Rat Absorption and Distribution%朱砂、朱砂安神丸及氯化汞在小鼠体内吸收、分布对比

    Institute of Scientific and Technical Information of China (English)

    付中祥; 杨虹; 陈秀芬; 刘杰; 时京珍

    2013-01-01

    目的:对比研究朱砂、朱砂安神丸及氯化汞在小鼠体内的吸收、分布规律.方法:昆明种小鼠180只,分为正常组、朱砂临床剂量组(0.2 g·kg-1,ig)、朱砂高剂量组(11.2 g·kg-1,ig)、朱砂安神丸组(2 g·kg-1,ig)、氯化汞组(0.07 g·kg-1,ig),每组小鼠在给药1,2,4,8,16,24 h后各取6只鼠的血、脑、肝、肾,原子荧光光度法检测汞含量.结果:朱砂临床剂量组和朱砂安神丸组体内最大血药浓度及各时间点血药浓度与氯化汞组相比具有明显差异(P<0.05);朱砂临床剂量组与朱砂安神丸组各时间点肝、肾组织中汞含量与氯化汞组有显著性差异(p< 0.05);朱砂临床剂量组和朱砂高剂量组在血液和组织中汞含量亦有显著性差异(P<0.05);朱砂高剂量组脑中汞含量最高.结论:临床剂量的朱砂、朱砂安神丸的汞吸收及各组织的汞含量均明显低于高剂量的朱砂和氯化汞.%Objective: To study the regulation of Cinnabar, Zhusha Anshen wan (ZSASW) and HgS on absorption and distribution in mice. Method: Oral gavage was given to Kunming mice with cinnabar (0. 2 g · kg-1), high dose of cinnabar (11.2 g·kg-1), ZSASW (2g·kg-1) , HgS (0.07 g·kg-1) or saline daily for 1, 2, 4, 8, 16, 24 hours, mercury accumulation in blood, liver, kidney and brain was determined by atomic fluoresence detector. Result: In comparison, the maximal serum concentration and serum concentration in each time of cinnabar clinical dose group and ZSASW group have obvious difference with the HgCl2 group. The mercury accumulation in liver and kidney in each time of clinical dose group and ZSASW group have obvious difference with the HgCl2 group. The mercury accumulation in blood and organs also had obvious difference between cinnabar clinical dose group and high dose group, and the high dose has the maximal accumulation in brain. Conclusion: Both cinnabar clinical dose group and ZSASW group have obvious difference with cinnabar high

  4. The role of clinical pharmacists in the diagnosis and treatment of mercury poisoning caused by the topical use of cinnabar%临床药师在朱砂外用致汞中毒诊治中的作用

    Institute of Scientific and Technical Information of China (English)

    于丽; 轩姣; 李晋宝

    2016-01-01

    Objective:To explore the role of clinical pharmacists in the diagnosis and treatment of drug poisoning. Methods:According to the symptoms and medication history of the patient with mercury poisoning caused by topical use of cinnabar, clinical pharmacists provided some vermilion composition information for physicians and the basis for early diagnosis, and recommended to check the urinary mercury concentration and participated in the design of the treatment plan and carry out medication supervision after the clear diagnosis. Results:The concentration of acute urinary mercury in the patient exceeded the standard, however, it decreased to the normal level after the treatment of eliminating mercury and protecting liver and the condition was significantly improved. Conclusion: Clinical pharmacists can provide drug information for physicians in the treatment of drug poisoning, participate in making drug treatment plan and carry out pharmaceutical care.%目的:探讨临床药师在药物致中毒诊治中的作用。方法:在外用朱砂致汞中毒患者救治中,临床药师结合患者症状和用药史,为医师提供朱砂成分信息,并提出检查尿汞浓度的建议,为及早诊断提供依据,诊断明确后参与治疗方案的设计并开展用药监护。结果:急查患者尿汞浓度超标,经驱汞、保肝等治疗后,尿汞浓度降至正常,病情明显好转。结论:临床药师能够在药物中毒救治中提供药品信息、参与制定药物治疗方案和开展药学监护。

  5. 朱砂灌胃给药后汞在孕大鼠脏器内的分布和排泄途径研究%Study on Distribution in Organs and Excretion Pathway of Mercury in Pregnant Rats after Administration of Cinnabar

    Institute of Scientific and Technical Information of China (English)

    汤家铭; 米金霞; 吴文斌; 谷颖敏; 李咏梅; 夏晶; 张甦; 曹帅; 季申

    2011-01-01

    Objective: To study the distribution and excretion pathway of mercury in pregnant rats after administration of cinnabar. Methods; Compared with the reproductive toxicity test, the female SD rats after mating were randomly divided into high (1 000 mg/kg) , medium (300 mg/kg) , and low-dose (100 mg/kg) cinnabar groups, and negative control group (0.5% CMC-Na) , with ten rats in each group. The rats in different dose cinnabar groups were administered intragastrically with cinnabar from the sixth day to the fifteenth day after pregnancy, and all the rats were sacrificed on the twentieth day of pregnancy. The main organs (including heart, liver, spleen, lung, kidney, brain and uterus) , blood, placentae, fetuses and urine of the pregnant rats were obtained to detect the mercury concentration by inductively coupled plasma mass spectrometry ( ICP-MS) ; the feces were taken at different time points to determine the mercury concentration by inductively coupled plasma optical emission spectrometer (ICP-OES) ; the distribution in different organs and the excretion pathway of mercury were analyzed. Results: The mercury concentrations of the heart, liver, kidney and uterus of the rats in different dose cinnabar groups were higher than those of the rats in negative control group, and the concentration increased with the enhanced dose; there was no statistical difference on the mercury concentrations of the brain, placentae and fetuses between different dose cinnabar groups and negative control group. There were large amount of mercury in the feces on the second day after administration, and the mercury excretion accounted for 38. 2% ~ 50.4% of HgS intake; while the mercury excretion accounted for72.2% -86.6% on the tenth day after administration; The a-mount of HgS discharged in the feces decreased rapidly on the fourth day after drug discontinuation. Only extreme trace of mercury excreted from urine with dose-dependent pattern, and the mercury excretion maintained the high

  6. Dissolution, absorption and bioaccumulation in gastrointestinal tract of mercury in HgS-containing traditional medicines Cinnabar and Zuotai%含HgS传统药物朱砂和佐太中汞的胃肠道溶出及吸收蓄积研究

    Institute of Scientific and Technical Information of China (English)

    郑植元; 李岑; 张明; 杨红霞; 耿卢婧; 李林帅; 杜玉枝; 魏立新

    2015-01-01

    中药朱砂和藏药佐太的主要成分分别为α-HgS和β-HgS,但是关于朱砂、佐太、α-HgS和β-HgS中的汞在人体胃肠道中的溶出吸收以及在器官中的分布蓄积的比较研究未见报道.该研究模拟了4种硫化汞类化合物在人体胃肠道中的溶出过程,然后测定汞溶出度,分别比较不同药物间汞溶出度差异以及不同溶液的促溶能力差异.为了探究朱砂和佐太在机体内的吸收蓄积情况,分别以其临床等效剂量灌胃小鼠,同时设置与朱砂等汞量的α-HgS和β-HgS给药组,以及与佐太等汞量的β-HgS和HgC12给药组,然后比较各组不同药物中的汞在小鼠体内吸收蓄积能力差异以及小鼠不同组织器官对汞的蓄积能力差异.实验结果表明,佐太在人工胃肠液中的汞溶出度均较大,其次是β-HgS,朱砂和α-HgS也有一定的溶出.对于小鼠汞吸收蓄积实验,HgCl2吸收蓄积能力最强,β-HgS其次,α-HgS略强于朱砂;不同器官对汞的蓄积能力大小依次是肾>肝>脑.该研究贴近临床实际,观察含汞药物朱砂和佐太在胃肠道中的溶出以及吸收分布蓄积,为临床安全用药提供参考,也希望为含重金属药物的安全性评价提供研究模式.%α-HgS is the main component of traditional Chinese medicine cinnabar,while β-HgS is the main component of Tibetan medicine Zuotai.However,there was no comparative study on the dissolution and absorption in gastrointestinal tract and bioaccumulation in organs of mercury in Cinnabar,Zuotai,α-HgS and β-HgS.In this study,the dissolution process of the four compounds in the human gastrointestinal tract was simulated to determine the mercury dissolutions and compare the mercury dissolution of different medicines and the dissolution-promoting capacity of different solutions.To explore the absorption and bioaccumulation of cinnabar and Zuotai in organisms,mice were orally administered with clinical equivalent doses cinnabar and Zuotai

  7. Pyrrolizidine Alkaloid Composition Influences Cinnabar Moth Oviposition Preferences in Jacobaea Hybrids

    NARCIS (Netherlands)

    Cheng, D.; Meijden, van der E.; Mulder, P.P.J.; Vrieling, K.; Klinkhamer, P.G.L.

    2013-01-01

    Plants produce a variety of secondary metabolites (PSMs) that may be selective against herbivores. Yet, specialist herbivores may use PSMs as cues for host recognition, oviposition, and feeding stimulation, or for their own defense against parasites and predators. This summarizes a dual role of PSMs

  8. Speciation and bioaccessibility of mercury in adobe bricks and dirt floors in Huancavelica, Peru

    Science.gov (United States)

    Background: Huancavelica, Peru, a historic cinnabar refining site, is one of the most mercury (Hg) contaminated urban areas in the world. Residents’ exposures are amplified because residents build their adobe brick homes from contaminated soil. Objectives: The objectives of th...

  9. Mercury isotope fractionation during ore retorting in the Almadén mining district, Spain

    Science.gov (United States)

    Gray, John E.; Pribil, Michael J.; Higueras, Pablo L.

    2013-01-01

    Almadén, Spain, is the world's largest mercury (Hg) mining district, which has produced over 250,000 metric tons of Hg representing about 30% of the historical Hg produced worldwide. The objective of this study was to measure Hg isotopic compositions of cinnabar ore, mine waste calcine (retorted ore), elemental Hg (Hg0(L)), and elemental Hg gas (Hg0(g)), to evaluate potential Hg isotopic fractionation. Almadén cinnabar ore δ202Hg varied from − 0.92 to 0.15‰ (mean of − 0.56‰, σ = 0.35‰, n = 7), whereas calcine was isotopically heavier and δ202Hg ranged from − 0.03‰ to 1.01‰ (mean of 0.43‰, σ = 0.44‰, n = 8). The average δ202Hg enrichment of 0.99‰ between cinnabar ore and calcines generated during ore retorting indicated Hg isotopic mass dependent fractionation (MDF). Mass independent fractionation (MIF) was not observed in any of the samples in this study. Laboratory retorting experiments of cinnabar also were carried out to evaluate Hg isotopic fractionation of products generated during retorting such as calcine, Hg0(L), and Hg0(g). Calcine and Hg0(L) generated during these retorting experiments showed an enrichment in δ202Hg of as much as 1.90‰ and 0.67‰, respectively, compared to the original cinnabar ore. The δ202Hg for Hg0(g) generated during the retorting experiments was as much as 1.16‰ isotopically lighter compared to cinnabar, thus, when cinnabar ore was roasted, the resultant calcines formed were isotopically heavier, whereas the Hg0(g) generated was isotopically lighter in Hg isotopes.

  10. Isotopic variability of mercury in ore, mine-waste calcine, and leachates of mine-waste calcine from areas mined for mercury.

    Science.gov (United States)

    Stetson, Sarah J; Gray, John E; Wanty, Richard B; Macalady, Donald L

    2009-10-01

    The isotopic composition of mercury (Hg) was determined in cinnabar ore, mine-waste calcine (retorted ore), and leachates obtained from water leaching experiments of calcine from two large Hg mining districts in the U.S. This study is the first to report significant mass-dependent Hg isotopic fractionation between cinnabar ore and resultant calcine. Data indicate that delta202Hg values relative to NIST 3133 of calcine (up to 1.52 per thousand) in the Terlingua district, Texas, are as much as 3.24 per thousand heavier than cinnabar (-1.72 per thousand) prior to retorting. In addition, delta202Hg values obtained from leachates of Terlingua district calcines are isotopically similar to, or as much as 1.17 per thousand heavier than associated calcines, most likely due to leaching of soluble, byproduct Hg compounds formed during ore retorting that are a minor component in the calcines. As a result of the large fractionation found between cinnabar and calcine, and because calcine is the dominant source of Hg contamination from the mines studied, delta202Hg values of calcine may be more environmentally important in these mined areas than the primary cinnabar ore. Measurement of the Hg isotopic composition of calcine is necessary when using Hg isotopes for tracing Hg sources from areas mined for Hg, especially mine water runoff.

  11. A structural study of the pseudo-binary mercury chalcogenide alloy HgSe sub 0 sub . sub 7 S sub 0 sub . sub 3 at high pressure

    CERN Document Server

    Kozlenko, D P; Hull, S; Knorr, K; Savenko, B N; Shchennikov, V V; Voronin, V I

    2002-01-01

    The structure of the pseudo-binary mercury chalcogenide alloy HgSe sub 0 sub . sub 7 S sub 0 sub . sub 3 has been studied by means of X-ray and neutron powder diffraction at pressure up to 8.5 GPa. A phase transition from the cubic zinc blende structure to the hexagonal cinnabar structure was observed at P approx 1 GPa. The obtained structural parameters were used for the analysis of the geometrical relationship between the zinc blende and the cinnabar phases. The zinc blende-cinnabar phase transition is discussed in the framework of the Landau theory of phase transitions. It was found that the possible order parameter for the structural transformation is the spontaneous strain e sub 4. This assignment agrees with previously observed high pressure behaviour of the elastic constants of other mercury chalcogenides

  12. Dicty_cDB: Contig-U16033-1 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available atus heat shock p... 160 5e-38 EU679412_1( EU679412 |pid:none) Tetranychus cinnabari...none) Mus musculus activated spleen cDNA... 160 5e-38 EU679414_1( EU679414 |pid:none) Tetranychus cinnabar

  13. Mercury hair levels and factors that influence exposure for residents of Huancavelica, Peru

    Science.gov (United States)

    Between 1564 and 1810, nearly 17,000 metric tons of mercury (Hg) vapor were released to the environment during cinnabar refining in the small town of Huancavelica, Peru. The present study characterizes individual exposure to mercury using total and speciated Hg from residential s...

  14. Inferring Ancient Technology and Practices of the Elite Maya Kingship Through the Application of Materials Engineering Characterization Modalities

    Science.gov (United States)

    Cheung, Kristina Alyssa

    This project focuses on the characterization of materials from burial offerings and painted decoration in a royal Maya tomb at El Zotz, Guatemala, and their association with mortuary rituals. Archaeological findings included vessels, jade masks, organic materials (wood, cord, and textiles), specular hematite cubes, shells with powdered cinnabar, green (malachite) painted stucco assumed to have decorated the wooden bier where the king was resting, and caches of lip-to-lip Aguila Orange bowls containing human phalanges. This paper describes findings from non-invasive and non-destructive analytical techniques including XRF, VPSEM-EDS, and XRD, emphasizing the potential of these combined technologies in the identification of organic and inorganic markers to infer burial customs. The nature and location of the findings, the evidence of pigment coloration on the bones employing hematite and cinnabar, and the indication of exposure of the bones to high temperatures suggest highly complex, even protracted mortuary practices of Maya elite.

  15. Attenuation by methyl mercury and mercuric sulfide of pentobarbital induced hypnotic tolerance in mice through inhibition of ATPase activities and nitric oxide production in cerebral cortex

    Energy Technology Data Exchange (ETDEWEB)

    Chuu, Jiunn-Jye; Huang, Zih-Ning; Yu, Hsun-Hsin; Chang, Liang-Hao [College of Engineering, Southern Taiwan University, Institute of Biotechnology, Tainan (China); Lin-Shiau, Shoei-Yn [College of Medicine, National Taiwan University, Institute of Pharmacology, Taipei (China)

    2008-06-15

    This study is aimed at exploring the possible mechanism of hypnosis-enhancing effect of HgS or cinnabar (a traditional Chinese medicine containing more than 95% HgS) in mice treated with pentobarbital. We also examined whether the effect of HgS is different from that of the well-known methyl mercury (MeHg). After a short period (7 days) of oral administration to mice, a nontoxic dose (0.1 g/kg) of HgS not only significantly enhanced pentobarbital-induced hypnosis but also attenuated tolerance induction; while a higher dose (1 g/kg) of HgS or cinnabar exerted an almost irreversible enhancing effect on pentobarbital-hypnosis similar to that of MeHg (2 mg/kg) tested, which was still effective even after 10 or 35 days cessation of administration. To study comparatively the effects of different mercury forms from oral administration of MeHg and HgS on membrane ATPase activities of experimental mice, analysis of the Hg content in the cerebral cortex revealed that correlated with the decrease of Na{sup +}/K{sup +}-ATPase and Ca{sup 2+}-ATPase activities. Furthermore, NO levels of blood but not that of cerebral cortex were also decreased by mercuric compounds. Although pentobarbital alone enhanced cytochrome p450-2C9 in time dependent manner, all of mercurial compounds tested had no such effect. All of these findings indicated that the mercurial compounds including cinnabar, HgS and MeHg exert a long-lasting enhancing hypnotic activity without affecting pentobarbital metabolism, which provides evidence-based sedative effect of cinnabar used in Chinese traditional medicine for more than 2,000 years. The nontoxic HgS dosing (0.1 g/kg/day) for consecutive 7 days is perhaps useful for delaying or preventing pentobarbital-tolerance. (orig.)

  16. Bioprotective properties of Dragon's blood resin: In vitro evaluation of antioxidant activity and antimicrobial activity

    OpenAIRE

    Gupta Rajinder K; Gupta Deepika

    2011-01-01

    Abstract Background Food preservation is basically done to preserve the natural characteristics and appearance of the food and to increase the shelf life of food. Food preservatives in use are natural, chemical and artificial. Keeping in mind the adverse effects of synthetic food preservatives, there is a need to identify natural food preservatives. The aims of this study were to evaluate in vitro antioxidant and antimicrobial activities of Dragon's blood resin obtained from Dracaena cinnabar...

  17. Impact of Mercury Mine Activities on Water Resources at Azzaba-North-East of Algeria

    OpenAIRE

    Fadila Alligui; Abdelhak Boutaleb

    2010-01-01

    Problem statement: Mercury mineralization occurred in Azzaba (north-eastern Algeria) as a part of mercurial Numidian belt, consists of numerous of Hg deposits (Koudiat Sma, Mrasma, Guenicha, Fendek, Ismail and Ras Elma). These deposits are hosted in a variety of lithologies including sandstone, limestone, breccias and conglomerate. The ores occur as cinnabar deposits in Ypresian-Lutetian formations. Although the quantity and type of information relating to mining oper...

  18. Geochemistry of mercury mineralization and its environmental influence in the Tavreh area, west of Khoy, NW Iran

    OpenAIRE

    Ali Imamalipour; Jafar Abdolahisharif

    2011-01-01

    Mercury mineralization has occurred in relation with a listwaenitic type hydrothermal alteration system in Tavreh area located northwest of Khoy. Mercury-bearing alteration zone which has an area about 0.4 km2 is situated in one of Aland river upstreams. The only mercury compound found in this district is mercury sulfide (cinnabar) deposited as vein and veinlet forms. Geochemical investigations indicate that mercury distribution has variable values which vary between 0.36-10500 ppm. Its avera...

  19. 全痔膏质量标准的研究

    Institute of Scientific and Technical Information of China (English)

    费丽娜; 施琳; 牟晓博

    2014-01-01

    Objective To establish the quality control method of ingredients borneol, borax, talcum powder, cinnabar and vermillion cinnabar in Quan Zhi Gao. Methods The thin layer chromatography (TLC), the physical and chemical analysis method and atomic fluorescence spec-trophotometry were used in the analyses, respectively. Results The identifying TLC experiments of borneol and physical and chemical analysis identifying experiments of borax and talcum powder, all have good reproducibilities. HgS contents in cinnabar and vermilion conformed to the provisions. Conclusion The method established is simple, accurate, reliable and can be used in quality control of Quan Zhi Gao.%目的:建立全痔膏中冰片、硼砂、滑石粉、朱砂和银朱药味的质量控制方法。方法分别采用薄层色谱法,理化分析法,原子荧光分光光度法。结果冰片薄层鉴别实验重现性良好;硼砂和滑石粉理化反应鉴别试验重现性良好;原子荧光分光光度法测朱砂与银朱中硫化汞含量实验结果符合规定。结论该方法简便易行,准确可靠,可用于全痔膏的质量控制。

  20. Sulphur isotope geochemistry of the ores and country rocks at the Almadén mercury deposit, Ciudad Real, Spain

    Science.gov (United States)

    Saupé, Francis; Arnold, Michel

    1992-10-01

    Seventy-four new S isotope analyses of ore minerals and country rocks are given for the Hg deposit of Almadén. The spread of the cinnabar δ34S is narrow within each of the three orebodies, but the δ34S average values differ sufficiently between them (mean δ34S: San Nicolas = 0.2 ± 1.1 %., San Francisco = 8.1 ± 0.7%., San Pedro = 5.9 ± 1.0%.) to indicate three different mineralization episodes and possibly processes. The unweighted mean for all cinnabar samples is 5.6%. and the S source is considered to be the host-rocks, either the Footwall Shales ( δ34S = 5.5%.) or the spilites ( δ34 S = 5.1 ± 1.3%.). For geometric and chronologic reasons, the former seem the best potential source. However, the high δ34 S values of the San Francisco cinnabar cannot be explained without addition of heavy S from reduction of seawater sulphate. Orderly distributions of the δ34S values are observed in all three orebodies: (1) their increase from the stratigraphic bottom to the top in the San Pedro orebody is explained by a Rayleigh process, and (2) the maxima in the centres of the San Francisco and San Nicolas orebodies are explained by mixing of the S transporting hydrothermal fluids with seawater within the sediments. Associated pyrite and cinnabar were deposited under isotopic disequilibrium, probably because the low solubility of cinnabar caused rapid precipitation of cinnabar. The different morphological pyrite types have their own isotopic δ34S signatures. The spilites are notably enriched in S ( n = 3; average S content = 0.56%) compared to normal basalts (1000 ppm) and have an average δ34S = 5.1 ± 1.3%.. The linear relationship between the δ34S and the S content of the spilites is interpreted as a mixing line between mantle S and a constant S source, probably an infinite open reservoir. An incomplete basalt-seawater reaction at nearly constant temperature is the best explanation for this relation. The S (predominantly pyrite) of the black shales ( n = 3; δ34S

  1. Mineral pigments at Huaca Tacaynamo (Chan Chan, Peru)

    OpenAIRE

    Brooks, William E.; Piminchumo, Víctor; Suárez, Héctor; Jackson, John C.; McGeehin, John P.

    2014-01-01

    X-ray diffraction analyses of five samples of pigments from a recently excavated mural at the archaeological site of Huaca Tacaynamo, a part of the Chan Chan archaeological complex, northern Peru, show that minerals related to metal occurrences known to have been exploited by ancient Andeans were also used as pigments. These minerals include: atacamite [Cu2Cl(OH3)] for green; azurite [Cu3(CO3)2(OH)2] for blue; calcite [CaCO3] for white; cinnabar [HgS] for red; and goethite [HFeO2] for yellow....

  2. Metallurgy of mercury in Almaden: from aludel furnaces until Pacific furnaces; La metalurgia del mercurio en Almaden: desde los hornos de aludeles a los hornos Pacific

    Energy Technology Data Exchange (ETDEWEB)

    Tejero-Manzanares, J.; Garrido Saenz, I.; Mata Cabrera, F.; Rubio Mesas, M. L.

    2014-07-01

    This paper shows the different types of furnaces for roasting cinnabar, used in the metallurgy of quicksilver over the centuries of exploitation of the Almaden Mines (Spain). Some of these techniques are part of our industrial heritage. They have contributed to name UNESCO World Heritage Site the vast technological legacy of these mines recently. This research contributes to close the long way of metallurgical activity from aludel furnaces until Pacif furnaces, first and lasted technology to produce on an industrial scale. It is delved into the most relevant aspects having to do with the type, evolution and number of furnaces existing on each of the periods. (Author)

  3. 两名律师的“纯粹环球高尔夫”

    Institute of Scientific and Technical Information of China (English)

    Alfie

    2010-01-01

    <正>9月了,Michael Goldstein和JamiePatton会继续呆在美国进行他们的高尔夫"巡回",算起来,这两个人已经在美国停留了一个多月,从西海岸一直挥杆到东海岸。最后一次与他们取得联系是在5月中旬,那时候这两个小伙子正在硅谷的Cinnabar Hills体验那里的低温和高山

  4. Combined Technique Analysis of Punic Make-up Materials

    Energy Technology Data Exchange (ETDEWEB)

    Huq,A.; Stephens, P.; Ayed, N.; Binous, H.; Burgio, L.; Clark, R.; Pantos, E.

    2006-01-01

    Ten archaeological Punic make-up samples from Tunisia dating from the 4th to the 1st centuries BC were analyzed by several techniques including Raman microscopy and synchrotron X-ray diffraction in order to determine their compositions. Eight samples were red and found to contain either quartz and cinnabar or quartz and haematite. The remaining two samples were pink, the main diffracting phase in them being quartz. Examination of these two samples by optical microscopy and by illumination under a UV lamp suggest that the pink dye is madder. These findings reveal the identities of the materials used by Carthaginians for cosmetic and/or ritual make-up purposes.

  5. Mercury in vegetation of the Mount Amiata area (Italy)

    Energy Technology Data Exchange (ETDEWEB)

    Bargagli, R.; Barghigiani, C.; Maserti, B.E.

    1986-01-01

    In the mercury mining area of Mount Amiata metal contents were determined in plant parts of Pinus nigra, Cedrus atlantica and Cytisus scoparius, in lichens and in soil. Mercury concentrations were higher in vegetation growing on spoil banks of abandoned roasted cinnabar than near geothermal power plants. Green plant parts accumulated mercury to a greater extent than branch and root wood, and a mercury concentration increase was found in ageing pine and cedar needles. Moreover, in the most contaminated location, mercury contents in cedar needles decreased with the distance from the ground. Considerations and hypothesis were made on mercury uptake by plants in this area.

  6. First-principles study of structural and electronic properties of different phases of GaAs

    Energy Technology Data Exchange (ETDEWEB)

    Arabi, H. [Faculty of Science, Department of Physics, University of Birjand, Birjand (Iran, Islamic Republic of)]. E-mail: harabi@birjand.ac.ir; Pourghazi, A. [Faculty of Science, Department of Physics, University of Isfahan, Isfahan (Iran, Islamic Republic of); Ahmadian, F. [Faculty of Science, Department of Physics, University of Birjand, Birjand (Iran, Islamic Republic of); Nourbakhsh, Z. [Faculty of Science, Department of Physics, University of Isfahan, Isfahan (Iran, Islamic Republic of)

    2006-03-01

    We present a theoretical investigation of structural and electronic properties of the four known structural phases of GaAs (zinc-blende, sc16, cinnabar and Cmcm). We used the full potential linearized augmented plane wave method, within local density approximation, and also within generalized gradient approximation for the exchange correlation potential. The lattice constants, bulk modulus and its pressure derivative are calculated for each of the four phases. The data obtained for the transition pressures between different phases are presented. Band structures and densities of states of the four phases are also given. The results are compared with previous calculations and with experimental results.

  7. Photoassisted carbon dioxide reduction and formation of twoand three-carbon compounds. [prebiological photosynthesis

    Science.gov (United States)

    Halmann, M.; Aurian-Blajeni, B.; Bloch, S.

    1981-01-01

    The photoassisted reduction of aqueous carbon dioxide in the presence of naturally occurring minerals is investigated as a possible abiotic precursor of photosynthesis. Aqueous carbon dioxide saturated suspensions or surfaces of the minerals nontronite, bentonite, anatase, wolframite, molybdenite, minium, cinnabar and hematite were irradiated with high-pressure mercury lamps or sunlight. Chemical analyses reveal the production of formic acid, formaldehyde, methanol and methane, and the two and three-carbon compounds glyoxal (CHOCHO) and malonaldehyde (CH2(CHO)2). It is suggested that such photosynthetic reactions with visible light in the presence of semiconducting minerals may provide models for prebiological carbon and nitrogen fixation in both oxidized and reduced atmospheres.

  8. Gold-silver mining districts, alteration zones, and paleolandforms in the Miocene Bodie Hills Volcanic Field, California and Nevada

    Science.gov (United States)

    Vikre, Peter G.; John, David A.; du Bray, Edward A.; Fleck, Robert J.

    2015-09-25

    The Bodie Hills is a ~40 by ~30 kilometer volcanic field that straddles the California-Nevada state boundary between Mono Lake and the East Walker River. Three precious metal mining districts and nine alteration zones are delineated in Tertiary-Quaternary volcanic and Mesozoic granitic and metamorphic rocks that comprise the volcanic field. Cumulative production from the mining districts, Bodie, Aurora, and Masonic, is 3.4 million ounces of gold and 28 million ounces of silver. Small amounts of mercury were produced from the Potato Peak, Paramount-Bald Peak, and Cinnabar Canyon-US 395 alteration zones; a native sulfur resource in the Cinnabar Canyon-US 395 alteration zone has been identified by drilling. There are no known mineral resources in the other six alteration zones, Red Wash-East Walker River, East Brawley Peak, Sawtooth Ridge, Aurora Canyon, Four Corners, and Spring Peak. The mining districts and alteration zones formed between 13.4 and 8.1 Ma in predominantly ~15–9 Ma volcanic rocks of the Bodie Hills volcanic field. Ages of hydrothermal minerals in the districts and zones are the same as, or somewhat younger than, the ages of volcanic host rocks.

  9. A microencapsulation process of liquid mercury by sulfur polymer stabilization/solidification technology. Part I: Characterization of materials

    Energy Technology Data Exchange (ETDEWEB)

    Lopez-Delgado, A.; Lopez, F. A.; Alguacil, F. J.; Padilla, I.; Guerrero, A.

    2012-11-01

    European Directives consider mercury a priority hazardous substance due to its adverse effects on human health and the environment. In response to environmental concerns, a microencapsulation process has been developed within the European LIFE program as a long-term storage option for mercury. This process leads to the obtainment of a stable concrete-like sulfur matrix that allows the immobilization of mercury. The final product, in the form of a solid block containing up to 30 % Hg, exhibits excellent mechanical properties (compressive strength 53-61MPa and flexural strength 7-10 MPa), low porosity (0.57 % PHe), very low total pore volume (0.63x10-2 cm{sup 3} g{sup -}1), and extremely low permeability (coefficient of water absorption by capillarity 0.07 g cm{sup -}2). Toxicity characteristic leaching tests reveal a mercury concentration in leachates well below the 0.2 mg L{sup -}1 set out in US EPA Land Disposal Restrictions (LDRs). The values of mercury vapor emissions of final products were lower than those of cinnabar and meta cinnabar. (Author)

  10. Characterisation of Almadén mercury mine environment by XAS techniques.

    Science.gov (United States)

    Bernaus, Anna; Gaona, Xavier; Valiente, Manuel

    2005-08-01

    This manuscript describes the analysis and evaluation of mercury species present in three different types of samples (ore, slag and soil) belonging to the abandoned mining area of Almadén (Spain), by means of X-ray Absorption Spectroscopy (XAS) techniques. The applied methodology includes the analysis of possible interfering compounds by ICP-OES and the characterisation of solid samples by identification of heterogeneities using SEM-EDS technique prior to measurements at the synchrotron facilities (ESRF in Grenoble, France and HASYLAB in Hamburg, Germany) and subsequent analysis of data. Results show that cinnabar is the main species both in ore and soil samples, its concentration ranging from 41 to 77% of the total mercury content. On the other hand, metacinnabar (a polymorph of cinnabar) is shown to be the main species in slag samples (42-88%). Other mercury forms have been found in minor proportions (<30%), such as slightly soluble mercury salts (HgCl(2) and HgSO(4)) and HgO. This is the first time that Almadén-type mercury ores have been characterised by a synchrotron-based spectroscopic technique for a direct determination of mercury species. The conclusions presented in this report show the important similarities between Almadén and hot-spring type mercury mineral deposits, despite its different geological origin.

  11. Carrier behavior of HgTe under high pressure revealed by Hall effect measurement

    Institute of Scientific and Technical Information of China (English)

    胡廷静; 崔晓岩; 李雪飞; 王婧姝; 吕秀梅; 王棱升; 杨景海; 高春晓

    2015-01-01

    We investigate the carrier behavior of HgTe under high pressures up to 23 GPa using in situ Hall effect measurements. As the phase transitions from zinc blende to cinnabar, then to rock salt, and finally to Cmcm occur, all the parameters change discontinuously. The conductivity variation under compression is described by the carrier parameters. For the zinc blende phase, both the decrease of carrier concentration and the increase of mobility indicate the overlapped valence band and conduction band separates with pressure. Pressure causes an increase in the hole concentration of HgTe in the cinnabar phase, which leads to the carrier-type inversion and the lowest mobility at 5.6 GPa. In the phase transition process from zinc blende to rock salt, Te atoms are the major ones in atomic movements in the pressure regions of 1.0–1.5 GPa and 1.8–3.1 GPa, whereas Hg atoms are the major ones in the pressure regions of 1.5–1.8 GPa and 3.1–7.7 GPa. The polar optical scattering of the rock salt phase decreases with pressure.

  12. Raman spectroscopic analysis of an important Visigothic historiated manuscript

    Science.gov (United States)

    Carter, Elizabeth A.; Perez, Fernando Rull; Garcia, Jesús Medina; Edwards, Howell G. M.

    2016-12-01

    Raman spectroscopy has been used to study fragments of early Visigothic historiated manuscripts from the important mediaeval library at Santo Domingo de Silos which were a part of a Beato dating from the tenth to the mid-eleventh centuries. These fragments are from some of the oldest manuscripts in the scriptorium of the monastery. In this study, a comparison is made between the pigments and inks used on these manuscripts and those used in a previous study of the unique Visigothic Beato de Valcavado in Santa Cruz, Valladolid, completed in the year 970, which is noted for its quality of execution as well as its content and is remarkable eschatologically in being identifiable as the complete work of only a single scribe. For comparative purposes, the pigments and inks used in the Silos Monastery Beato and a series of historiated early manuscripts from mediaeval times through to the Renaissance also held in the monastic library were analysed. Raman spectroscopy identified a range of mineral and organic pigments such as cinnabar, orpiment, minium, azurite and indigo. In addition, a number of admixtures were found, for example, indigo and orpiment to produce vergaut (green) and a mixture of cinnabar with iron-gall ink and cerussite to produce darker and lighter shades of red. Some interesting conclusions were drawn about the use of iron-gall and carbon-based inks. This article is part of the themed issue "Raman spectroscopy in art and archaeology".

  13. Thermal Treatment of Mercury Mine Wastes Using a Rotary Solar Kiln

    Directory of Open Access Journals (Sweden)

    Andrés Navarro

    2014-01-01

    Full Text Available Thermal desorption, by a rotary kiln of mercury contaminated soil and mine wastes, has been used in order to volatilize mercury from the contaminated medium. Solar thermal desorption is an innovative treatment that uses solar energy to increase the volatility of contaminants, which are removed from a solid matrix by a controlled air flow system. Samples of soils and mine wastes used in the experiments were collected in the abandoned Valle del Azogue mine (SE, Spain, where a complex ore, composed mainly of cinnabar, arsenic minerals (realgar and orpiment and stibnite, was mined. The results showed that thermal treatment at temperatures >400 °C successfully lowered the Hg content (2070–116 ppm to <15 mg kg−1. The lowest values of mercury in treated samples were obtained at a higher temperature and exposition time. The samples that showed a high removal efficiency (>99% were associated with the presence of significant contents of cinnabar and an equivalent diameter above 0.8 mm.

  14. Mediaeval cantorals in the Valladolid Biblioteca: FT-Raman spectroscopic study.

    Science.gov (United States)

    Edwards, H G; Farwell, D W; Rull Perez, F; Medina Garcia, J

    2001-03-01

    Raman spectroscopic studies of three mediaeval cantorals in the Biblioteca of the University of Valladolid has revealed information about the pigments used on these large manuscripts. Although executed in a simple colour palette, very pure cinnabar was used as the major colourant, offsetting the carbon black of the verses and script. A dark blue colour was achieved using a mixture of azurite (basic copper carbonate) and carbon, whereas a light blue colour was azurite alone. A grey colour was achieved using azurite, carbon particles and a calcareous 'limewash'. A yellow pigment, used sparely in the cantorals was ascribed to saffron; unusually, there was no evidence for the presence of the yellow mineral pigments orpiment, realgar and massicot. In several regions of the vellum specimens, evidence for biodeterioration was observed through the signatures of hydrated calcium oxalate. We report for the first time the Raman spectra of pigment in situ on a vellum fragment, which also shows evidence of substrate bands; comparison of black and red pigmented regions of vellum specimens has shown the presence of calcium oxalate in the black pigmented script but not in the red pigment regions, which suggests that the cinnabar in the red-pigmented regions acts as a toxic protectant for the vellum substrate against biological colonisation processes.

  15. In situ noninvasive Raman microspectroscopic investigation of polychrome plasterworks in the Alhambra.

    Science.gov (United States)

    Dominguez-Vidal, Ana; de la Torre-Lopez, Maria Jose; Rubio-Domene, Ramon; Ayora-Cañada, Maria Jose

    2012-12-21

    A totally non-invasive in situ investigation in one of the main halls of the Palace of the Lions in the Alhambra (Granada, Spain) has been carried out. Analyses were made with a fiber-optic portable Raman microspectrometer placed on scaffolding platforms at a height of ca. 12 m above the ground level during the period of conservation works. The objects of this study are the decorated plasterworks in the seven vaults of the Hall of the Kings. Together with the results, the different practical problems related to the positioning of the instrumental setup and the influence of the local environment during the analysis are discussed. In general, high quality spectra were obtained despite difficulties for micro-probe head positioning and sometimes the vibrations of the corresponding scaffold. Different typical antiquity pigments have been identified: cinnabar, minium, carbon black and lapis lazuli. Furthermore, the luminescence pattern from lapis lazuli found in most blue decorations has allowed the establishment of the natural origin and provenance of the pigment. Apart from this natural lapis lazuli, synthetic ultramarine blue was also found in one of the vaults showing up a recent restoration. In addition, some degradation products of cinnabar and minium were identified, with the major advantage of providing real-time information to the conservators during their work.

  16. Metabolomic profiling of permethrin-treated Drosophila melanogaster identifies a role for tryptophan catabolism in insecticide survival.

    Science.gov (United States)

    Brinzer, Robert A; Henderson, Louise; Marchiondo, Alan A; Woods, Debra J; Davies, Shireen A; Dow, Julian A T

    2015-12-01

    Insecticides and associated synergists are rapidly losing efficacy in target insect pest populations making the discovery of alternatives a priority. To discover novel targets for permethrin synergists, metabolomics was performed on permethrin-treated Drosophila melanogaster. Changes were observed in several metabolic pathways including those for amino acids, glycogen, glycolysis, energy, nitrogen, NAD(+), purine, pyrimidine, lipids and carnitine. Markers for acidosis, ammonia stress, oxidative stress and detoxification responses were also observed. Many of these changes had not been previously characterized after permethrin exposure. From the altered pathways, tryptophan catabolism was selected for further investigation. The knockdown of some tryptophan catabolism genes (vermilion, cinnabar and CG6950) in the whole fly and in specific tissues including fat body, midgut and Malpighian tubules using targeted RNAi resulted in altered survival phenotypes against acute topical permethrin exposure. The knockdown of vermilion, cinnabar and CG6950 in the whole fly also altered survival phenotypes against chronic oral permethrin, fenvalerate, DDT, chlorpyriphos and hydramethylnon exposure. Thus tryptophan catabolism has a previously uncharacterized role in defence against insecticides, and shows that metabolomics is a powerful tool for target identification in pesticide research.

  17. Mercury at the Oat Hill Extension Mine and James Creek, Napa County, California: Tailings, Sediment, Water, and Biota, 2003-2004

    Science.gov (United States)

    Slowey, Aaron J.; Rytuba, James J.; Hothem, Roger L.; May, Jason T.

    2007-01-01

    Executive Summary The Oat Hill Extension (OHE) Mine is one of several mercury mines located in the James Creek/Pope Creek watershed that produced mercury from the 1870's until 1944 (U.S. Bureau of Mines, 1965). The OHE Mine developed veins and mineralized fault zones hosted in sandstone that extended eastward from the Oat Hill Mine. Waste material from the Oat Hill Mine was reprocessed at the OHE Mine using gravity separation methods to obtain cinnabar concentrates that were processed in a retort. The U.S. Bureau of Land Management requested that the U.S. Geological Survey measure and characterize mercury and other chemical constituents that are potentially relevant to ecological impairment of biota in tailings, sediment, and water at the OHE Mine and in the tributaries of James Creek that drain the mine area (termed Drainage A and B) (Figs. 1 and 2). This report summarizes such data obtained from sampling of tailings and sediments at the OHE on October 17, 2003; water, sediment, and biota from James Creek on May 20, 2004; and biota on October 29, 2004. These data are interpreted to provide a preliminary assessment of the potential ecological impact of the mine on the James Creek watershed. The mine tailings are unusual in that they have not been roasted and contain relatively high concentrations of mercury (400 to 1200 ppm) compared to unroasted waste rock at other mines. These tailings have contaminated a tributary to James Creek with mercury primarily by erosion, on the basis of higher concentration of mercury (780 ng/L) measured in unfiltered (total mercury, HgT) spring water flowing from the OHE to James Creek compared to 5 to 14 ng/L HgT measured in James Creek itself. Tailing piles (presumably from past Oat Hill mine dumping) near the USBLM property boundary and upstream of the main OHE mine drainage channel (Drainage A; Fig. 2) also likely emit mercury, on the basis of their mercury composition (930 to 1200 ppm). The OHE spring water is likely an

  18. Modeling CO{sub 2}-Brine-Rock Interaction Including Mercury and H{sub 2}S Impurities in the Context of CO{sub 2} Geologic Storage

    Energy Technology Data Exchange (ETDEWEB)

    Spycher, N.; Oldenburg, C. M.

    2014-01-01

    This study uses modeling and simulation approaches to investigate the impacts on injectivity of trace amounts of mercury (Hg) in a carbon dioxide (CO{sub 2}) stream injected for geologic carbon sequestration in a sandstone reservoir at ~2.5 km depth. At the range of Hg concentrations expected (7-190 ppbV, or ~ 0.06-1.6 mg/std.m{sup 3}CO{sub 2}), the total volumetric plugging that could occur due to complete condensation of Hg, or due to complete precipitation of Hg as cinnabar, results in a very small porosity change. In addition, Hg concentration much higher than the concentrations considered here would be required for Hg condensation to even occur. Concentration of aqueous Hg by water evaporation into CO{sub 2} is also unlikely because the higher volatility of Hg relative to H{sub 2}O at reservoir conditions prevents the Hg concentration from increasing in groundwater as dry CO{sub 2} sweeps through, volatilizing both H{sub 2}O and Hg. Using a model-derived aqueous solution to represent the formation water, batch reactive geochemical modeling show that the reaction of the formation water with the CO{sub 2}-Hg mixture causes the pH to drop to about 4.7 and then become buffered near 5.2 upon reaction with the sediments, with a negligible net volume change from mineral dissolution and precipitation. Cinnabar (HgS(s)) is found to be thermodynamically stable as soon as the Hg-bearing CO{sub 2} reacts with the formation water which contains small amounts of dissolved sulfide. Liquid mercury (Hg(l)) is not found to be thermodynamically stable at any point during the simulation. Two-dimensional radial reactive transport simulations of CO{sub 2} injection at a rate of 14.8 kg/s into a 400 m-thick formation at isothermal conditions of 106°C and average pressure near 215 bar, with varying amounts of Hg and H{sub 2}S trace gases, show generally that porosity changes only by about ±0.05% (absolute, i.e., new porosity = initial porosity ±0.0005) with Hg predicted to readily

  19. Non-isothermal kinetics of the thermal desorption of mercury from a contaminated soil

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, F. A.; Sierra, M. J.; Rodriguez, O.; Millan, R.; Alguacil, F. J.

    2014-04-01

    The Almaden mining district (Ciudad Real, Spain) was the largest cinnabar (mercury sulphide) mine in the world. Its soils have high levels of mercury a consequence of its natural lithology, but often made much worse by its mining history. The present work examines the thermal desorption of two contaminated soils from the Almaden area under non-isothermal conditions in a N{sub 2} atmosphere, using differential scanning calorimetry (DSC). DSC was performed at different heating rates between room temperature and 600 degree centigrade. Desorption temperatures for different mercury species were determined. The Friedman, Flynn-Wall-Ozawa and Coasts Redfern methods were employed to determine the reaction kinetics from the DSC data. The activation energy and pre-exponential factor for mercury desorption were calculated. (Author)

  20. Cooperative expression of atomic chirality in inorganic nanostructures

    Science.gov (United States)

    Wang, Peng-Peng; Yu, Shang-Jie; Govorov, Alexander O.; Ouyang, Min

    2017-02-01

    Cooperative chirality phenomena extensively exist in biomolecular and organic systems via intra- and inter-molecular interactions, but study of inorganic materials has been lacking. Here we report, experimentally and theoretically, cooperative chirality in colloidal cinnabar mercury sulfide nanocrystals that originates from chirality interplay between the crystallographic lattice and geometric morphology at different length scales. A two-step synthetic scheme is developed to allow control of critical parameters of these two types of handedness, resulting in different chiral interplays expressed as observables through materials engineering. Furthermore, we adopt an electromagnetic model with the finite element method to elucidate cooperative chirality in inorganic systems, showing excellent agreement with experimental results. Our study enables an emerging class of nanostructures with tailored cooperative chirality that is vital for fundamental understanding of nanoscale chirality as well as technology applications based on new chiroptical building blocks.

  1. A simple external resistance heating diamond anvil cell and its application for synchrotron radiation x-ray diffraction.

    Science.gov (United States)

    Fan, Dawei; Zhou, Wenge; Wei, Shuyi; Liu, Yonggang; Ma, Maining; Xie, Hongsen

    2010-05-01

    A simple external heating assemblage allowing diamond anvil cell experiments at pressures up to 34 GPa and temperatures up to 653 K was constructed. This cell can be connected to the synchrotron radiation conveniently. The design and construction of this cell are fully described, as well as its applications for x-ray diffraction. Heating is carried out by using an external-heating system, which is made of NiCr resistance wire, and the temperature was measured by a NiCr-NiSi or PtRh-Pt thermocouple. We showed the performance of the new system by introducing the phase transition study of cinnabar (alpha-HgS) and thermal equation of state study of almandine at high pressure and temperature with this cell.

  2. Electronic structure of CdTe using GGA+U{sup SIC}

    Energy Technology Data Exchange (ETDEWEB)

    Menéndez-Proupin, E., E-mail: emenendez@uchile.cl [Departamento de Física, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, 780-0003 Ñuñoa, Santiago (Chile); Instituto de Energía Solar and Dept. Tecnologías Especiales, E.T.S.I. Telecomunicación, Universidad Politécnica de Madrid (Spain); Amézaga, A. [Departamento de Física, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, 780-0003 Ñuñoa, Santiago (Chile); Instituto de Ciencias Físicas y Matemáticas, Universidad Austral de Chile, Casilla 567, Valdivia (Chile); Cruz Hernández, N. [Departamento de Física Aplicada I, Escuela Técnica Superior de Ingeniería Informática, Universidad de Sevilla, Av. Reina Mercedes, 41012 Sevilla (Spain)

    2014-11-01

    A simple method to obtain a gap-corrected band structure of cadmium telluride within density functional theory is presented. On-site Coulomb self-interaction-like correction potential has been applied to the 5p-shell of Te and the 4d-shell of Cd. The predicted physical properties are similar to or better than those obtained with hybrid functionals and at largely reduced computational cost. In addition to the corrected electronic structure, the lattice parameters and the bulk modulus are improved. The relative stabilities of the different phases (zincblende, wurtzite, rocksalt and cinnabar) are preserved. The formation energy of the cadmium vacancy remains close to the values obtained from hybrid functional calculations.

  3. Preliminary study on mercury uptake by Rosmarinus officinalis L. (Rosemary) in a mining area (Mt. Amiata, Italy)

    Energy Technology Data Exchange (ETDEWEB)

    Barghigiani, C.; Ristori, T. [Institute of Biophysics, Pisa (Italy)

    1995-04-01

    Among the different plants analyzed to assess environmental mercury contamination of mining areas, lichens are those most studied, followed by brooms together with pine, which was also used in other areas, and spruce. Other species, both naturally occurring and cultivated, have also been studied. This work reports on the results of mercury uptake and accumulation in rosemary in relation to metal concentrations in both air and soil. R. officinalis is a widespread endemic Mediterranean evergreen shrub, which in Italy grows naturally and is also cultivated as a culinary herb. This research was carried out in Tuscany (Italy), in the Mt. Amiata area, which is characterized by the presence of cinnabar (HgS) deposits and has been used for mercury extraction and smelting from Etruscan times until 1980, and in the country near the town of Pisa, 140 km away from Mt. Amiata. 16 refs., 3 figs., 1 tab.

  4. Microstructural characterization of material used as supporter in pre hispanic paints; Caracterizacion microestructural de material utilizado como soporte en pinturas prehispanicas

    Energy Technology Data Exchange (ETDEWEB)

    Silva V, Y. [FIME-UANL, San Nicolas de los Garza, Nuevo Leon (Mexico); Zorrilla, C.; Canetas, J.; Hernandez, R.; Aguilar F, M.; Arenas A, J. [IFUNAM, 04510 Mexico D.F. (Mexico); Martinez, G. [INAH, 04000 Mexico D.F. (Mexico)

    2005-07-01

    The aim of this work is to show the characterization of pre hispanic paintings mainly of the materials that support the pigments. The samples come from three different archaeological sites, Palenque-Chiapas (two specimens), Teotihuacan-Estado de Mexico (one specimen) and Mitla-Oaxaca (one specimen); Mayan, Teotihuacan and Mixtec-Zapotec culture respectively. The samples were analyzed by Sem, EDS, Tem, XRD and IR. The results show calcite as common phase for all the samples, however exist other phases identified depending on the site as dolomite, ankerite, calcium silicon chloride, etc. The origin of the red color of the analyzed pigments were cinnabar (HgS) by a sample of Palenque and hematite (Fe{sub 2}O{sub 3}) by the other specimen, this last crystalline phase also present in the Mitla and Teotihuacan samples. By IR were identified some organic compounds in all the samples, but not copal. (Author)

  5. Neutron diffraction study of structural transformations in ternary systems of HgSe sub 1 sub - sub x S sub x mercury chalcogenides at high pressure

    CERN Document Server

    Voronin, V I; Berger, I F; Glazkov, V P; Kozlenko, D P; Savenko, B N; Tikhomirov, S V

    2001-01-01

    The structure of the ternary systems of the HgSe sub 1 sub - sub x S sub x mercury chalcogenides is studied at high pressures up to 35 kbar. It is established that by increase in the pressure in the HgSe sub 1 sub - sub x S sub x there takes place the transition from the sphalerite type cubic structure to the cinnabar type hexagonal structure, which is accompanied by the jump-like change in the elementary cell volume and interatomic distances. The parameters of the elementary cell and positional parameters of the Hg and Se/S for the hexagonal phase of high pressure are determined. The existence of the two-phase state in the area of the phase transformation is determined

  6. Characterization of pigments and ligands in a wall painting fragment from Liternum archaeological park (Italy).

    Science.gov (United States)

    Corso, Gaetano; Gelzo, Monica; Chambery, Angela; Severino, Valeria; Di Maro, Antimo; Lomoriello, Filomena Schiano; D'Apolito, Oceania; Dello Russo, Antonio; Gargiulo, Patrizia; Piccioli, Ciro; Arcari, Paolo

    2012-11-01

    Spectroscopic and MS techniques were used to characterize the pigments and the composition of polar and nonpolar binders of a stray wall painting fragment from Liternum (Italy) archaeological excavation. X-ray fluorescence and diffraction analysis of the decorations indicated mainly the presence of calcite, quartz, hematite, cinnabar, and cuprorivaite. Infrared spectroscopy, GC coupled to flame-ionization detector, and MS analysis of the polar and nonpolar components extracted from paint layers from three different color regions revealed the presence of free amino acids, sugars, and fatty acids. Interestingly, LC-MS shotgun analysis of the red painting region showed the presence of αS1-casein of buffalo origin. Compared to our previous results from Pompeii's wall paintings, even though the Liternum painting mixture contained also binders of animal origin, the data strongly suggest that in both cases a tempera painting technique was utilized.

  7. Hydrogeochemical and stream-sediment reconnaissance, orientation study, Ouachita Mountain area, Arkansas. National Uranium Resource Evaluation Program

    Energy Technology Data Exchange (ETDEWEB)

    Steele, K. F.

    1982-08-01

    A hydrogeochemical ground water orientation study was conducted in the multi-mineralized area of the Ouachita Mountains, Arkansas in order to evaluate the usefulness of ground water as a sampling medium for uranium exploration in similar areas. Ninety-three springs and nine wells were sampled in Clark, Garland, Hot Springs, Howard, Montgomery, Pike, Polk, and Sevier Counties. Manganese, barite, celestite, cinnabar, stibnite, copper, lead, and zinc are present. The following parameters were determined: pH, conductivity, alkalinity, U, Br, Cl, F, He, Mn, Na, V, Al, Dy, NO/sub 3/, NH/sub 3/, SO/sub 4/, and PO/sub 4/. The minerals appear to significantly affect the chemistry of the ground water. This report is issued in draft form, without detailed technical and copy editing. This was done to make the report available to the public before the end of the National Uranium Resource Evaluation.

  8. Mercury Methylation and Environmental Effects of Inactive Mercury Mines in the Circum-Pacific Region

    Science.gov (United States)

    Gray, J. E.

    2001-05-01

    Mercury mines worldwide contain of some the highest concentrations of mercury on earth, and as a result of local mercury contamination, these mines represent areas of environmental concern when mine-drainage enters downstream aquatic systems. The most problematic aspect of mine site mercury contamination is the conversion of inorganic mercury to highly toxic organic mercury compounds, such as methylmercury, and their subsequent uptake by aquatic organisms in surrounding ecosystems. Mercury and methylmercury concentrations were measured in sediment and water samples collected from several inactive mercury mines in Nevada, Alaska, and the Philippines, which are part of the circum-Pacific mineral belt. The mines studied represent different mercury deposit types and sizes, and climatic settings. Geochemical data collected from these mines indicate that areas surrounding hot-springs type mercury deposits generally have lower methylmercury concentrations than silica-carbonate mercury deposits. In hot-springs mercury deposits in Nevada and Alaska, ore is dominantly cinnabar with few acid-water generating minerals such as pyrite, and as a result, mine-water drainage has near neutral pH in which there is low solubility of mercury. Conversely, silica-carbonate deposits, such as Palawan, Philippines, contain abundant cinnabar and pyrite, and the resultant acidic-mine drainage generally has higher concentrations of mercury and methylmercury. Additional factors such as the proximity of mercury mines to wetlands, climatic effects, or mine wastes containing highly soluble mercury compounds potentially enhance mercury methylation. The Palawan mercury mine may be a unique example where several adverse environmental factors produced local mercury contamination, high mercury methylation, fish contamination, and mercury poisoning of humans that consumed these contaminated fish.

  9. A new approach to the determination of the synthetic or natural origin of red pigments through spectroscopic analysis

    Science.gov (United States)

    Franquelo, Maria Luisa; Perez-Rodriguez, Jose Luis

    2016-09-01

    This work suggests a way of differentiation between the natural or synthetic origin of inorganic materials that were historically used in the Cultural Heritage field. An exhaustive review of different reported procedures of synthesis of pigments was conducted, as well as a review of the accompanying minerals in case of natural pigments. The natural or synthetic origin of the pigments studied in this work was performed through the characterization of the accompanying minerals, in the case of the natural pigments, or the trace elements that are present as part of synthesis by-products or washing/purifying reagents and/or reactants that have only been partly removed in the final steps of these processes. This work characterized red pigments due to their wide variety, complexity and possibility of use in different mixtures. The following pigments were studied: cinnabar-vermilion, red lead and iron pigments. Also mixtures of these pigments between them and with red lake were also studied. Natural cinnabar was accompanied by silicon oxide (opal, chalcedony or quartz), calcite, clay minerals and, sometimes, pyrite. K together with S indicated a synthetic pigment (vermilion) obtained through the wet method. Nevertheless, K has not been found in layers containing only vermilion in our samples. The presence of Sn in some cases indicated vermilion that came from the dry process. K from the synthesis always appeared in the red lead pigment. The red natural ochre was confirmed by presence of clay minerals and iron. It should be said that Ca and S, and sometimes Al and K, were usually found in Mars red pigment. The presence of Al and Ca allowed the identification of carmine lake.

  10. Raman spectroscopic analysis of a `noli me tangere' painting

    Science.gov (United States)

    Hibberts, Stephen; Edwards, Howell G. M.; Abdel-Ghani, Mona; Vandenabeele, Peter

    2016-12-01

    The discovery of an oil painting in seriously damaged condition with an important historical and a heterodox detail with possible origins in the late fifteenth century has afforded the opportunity for Raman microscopic analysis prior to its restoration being undertaken. The painting depicts a risen Christ following His crucifixion in a `noli me tangere' pose with three women in an Italian terrace garden with a stone balustrade overlooking a rural landscape and an undoubted view of late-medieval Florence. The picture has suffered much abuse and is in very poor condition, which is possibly attributable to its controversial portrayal of a polydactylic Christ with six toes on His right foot. By the late sixteenth century, after the Council of Trent, this portrayal would almost certainly have been frowned upon by the Church authorities or more controversially as a depiction of the holy. Raman spectroscopic analysis of the pigments places the painting as being consistent chronologically with the Renaissance period following the identification of cinnabar, haematite, red lead, lead white, goethite, verdigris, caput mortuum and azurite with no evidence of more modern synthetic pigments or of modern restoration having been carried out. An interesting pigment mixture found here is that of the organic dye carmine and cinnabar to produce a particular bright red pigment coloration. Stratigraphic examination of the paint fragments has demonstrated the presence of an orange resin layer immediately on top of the canvas substrate, effectively rendering the pigment as a sandwich between this substratal resin and the overlying varnish. The Raman spectroscopic evidence clearly indicates that an attribution of the artwork to the Renaissance is consistent with the scientific analysis of the pigment composition. This article is part of the themed issue "Raman spectroscopy in art and archaeology".

  11. A recommended protocol for the preservation and storage of ';reactive' inorganic mercury in sediment

    Science.gov (United States)

    Stumpner, E. B.; Marvin-DiPasquale, M. C.; Alpers, C. N.; Fleck, J.

    2013-12-01

    Stannous-chloride-reducible divalent mercury, or ';reactive' mercury (Hg(II)R), is a methodologically defined Hg fraction that is increasingly being used as a surrogate measure of the Hg pool available for microbial Hg(II)-methylation. A critical examination of Hg(II)R stability was conducted in a set of experiments that examined techniques of sediment preservation and storage over time (1, 7, 30, 90, and 180 days), temperature (-80°C, -20°C, and 5°C), and with/without a glove bag that excluded atmospheric oxygen. A second set of experiments examined effects of homogenization and thaw time. On the basis of experimental results, a recommended protocol is presented here for studies where Hg(II)R is a targeted analyte. Recommendations include: (1) thorough sediment homogenization and sub-sampling for analysis of Hg(II)R, iron species, and total reduced sulfur inside of an oxygen-free glove bag, (2) refrigeration (5°C) storage after homogenization, and (3) completion of the Hg(II)R assay within 2 to 7 days after homogenization. Sediment for the experiments was chosen from four distinct Hg-contaminated sites surrounding the Sacramento-San Joaquin Delta and San Francisco Bay. Sites were chosen based on legacy Hg contamination in the form of cinnabar (HgS) from past Hg mining (Alviso Slough and Cache Creek sites), and elemental Hg from past gold mining (Cosumnes River and Humbug Creek (South Yuba River watershed) sites). Samples were chosen with a wide range of organic content, redox conditions, and total reduced sulfur concentration because these properties are known to influence Hg(II)R concentration. Geochemical modeling conducted with PHREEQC indicated that the oxidation of aqueous sulfide plays an important role in controlling the saturation index of cinnabar, which has a direct effect on the solubility of Hg(II), and by extension an influence on the sediment Hg(II)R assay.

  12. Geochemistry of mercury mineralization and its environmental influence in the Tavreh area, west of Khoy, NW Iran

    Directory of Open Access Journals (Sweden)

    Ali Imamalipour

    2011-11-01

    Full Text Available Mercury mineralization has occurred in relation with a listwaenitic type hydrothermal alteration system in Tavreh area located northwest of Khoy. Mercury-bearing alteration zone which has an area about 0.4 km2 is situated in one of Aland river upstreams. The only mercury compound found in this district is mercury sulfide (cinnabar deposited as vein and veinlet forms. Geochemical investigations indicate that mercury distribution has variable values which vary between 0.36-10500 ppm. Its average in alteration zone is 300 ppm, although its average reaches to 0.35 percent in the mineralized veins. Considering the Clarke amount of mercury, it has increased more than 3750 times in overall alteration zone and more than 46000 times in mineralized veins. Based on the stream sediment heavy mineral geochemistry, distribution of cinnabar under physical weathering and transportation processes has occurred at least 7 km far away from the altered zone in downstream sediments. Mercury concentrations in samples taken from surface and underground waters are less than 0.1µg/L. In comparison with mercury concentrations, data obtained from other world’s ore fields and considering the maximum permissible contaminant level in drinking waters, it can be concluded that the waters of this region have not been contaminated in mercury. Therefore, despite the extent of anomalous zone in Tavreh region, this zone cannot play a role as the contaminant source of environment. It is seemed that due to presence of mercury as stable mercury sulfide compound, the possibility of its leakage could not been obtained due to decomposition of this mineral.

  13. Distribution, speciation, and transport of mercury in stream-sediment, stream-water, and fish collected near abandoned mercury mines in southwestern Alaska, USA

    Science.gov (United States)

    Gray, J.E.; Theodorakos, P.M.; Bailey, E.A.; Turner, R.R.

    2000-01-01

    Concentrations of total Hg, Hg (II), and methylmercury were measured in stream-sediment, stream-water, and fish collected downstream from abandoned mercury mines in south-western Alaska to evaluate environmental effects to surrounding ecosystems. These mines are found in a broad belt covering several tens of thousands of square kilometers, primarily in the Kuskokwim River basin. Mercury ore is dominantly cinnabar (HgS), but elemental mercury (Hg(o)) is present in ore at one mine and near retorts and in streams at several mine sites. Approximately 1400 t of mercury have been produced from the region, which is approximately 99% of all mercury produced from Alaska. These mines are not presently operating because of low prices and low demand for mercury. Stream-sediment samples collected downstream from the mines contain as much as 5500 ??g/g Hg. Such high Hg concentrations are related to the abundance of cinnabar, which is highly resistant to physical and chemical weathering, and is visible in streams below mine sites. Although total Hg concentrations in the stream-sediment samples collected near mines are high, Hg speciation data indicate that concentrations of Hg (II) are generally less than 5%, and methylmercury concentrations are less than 1% of the total Hg. Stream waters below the mines are neutral to slightly alkaline (pH 6.8-8.4), which is a result of the insolubility of cinnabar and the lack of acid- generating minerals such as pyrite in the deposits. Unfiltered stream-water samples collected below the mines generally contain 500-2500 ng/l Hg; whereas, corresponding stream-water samples filtered through a 0.45-??m membrane contain less than 50 ng/l Hg. These stream-water results indicate that most of the Hg transported downstream from the mines is as finely- suspended material rather than dissolved Hg. Mercury speciation data show that concentrations of Hg (II) and methylmercury in stream-water samples are typically less than 22 ng/l, and generally less than

  14. Mercury mine drainage and processes that control its environmental impact

    Science.gov (United States)

    Rytuba, J.J.

    2000-01-01

    Mine drainage from mercury mines in the California Coast Range mercury mineral belt is an environmental concern because of its acidity and high sulfate, mercury, and methylmercury concentrations. Two types of mercury deposits are present in the mineral belt, silica-carbonate and hot-spring type. Mine drainage is associated with both deposit types but more commonly with the silica-carbonate type because of the extensive underground workings present at these mines. Mercury ores consisting primarily of cinnabar were processed in rotary furnaces and retorts and elemental mercury recovered from condensing systems. During the roasting process mercury phases more soluble than cinnabar are formed and concentrated in the mine tailings, commonly termed calcines. Differences in mineralogy and trace metal geochemistry between the two deposit types are reflected in mine drainage composition. Silica-carbonate type deposits have higher iron sulfide content than hot- spring type deposits and mine drainage from these deposits may have extreme acidity and very high concentrations of iron and sulfate. Mercury and methylmercury concentrations in mine drainage are relatively low at the point of discharge from mine workings. The concentration of both mercury species increases significantly in mine drainage that flows through and reacts with calcines. The soluble mercury phases in the calcines are dissolved and sulfate is added such that methylation of mercury by sulfate reducing bacteria is enhanced in calcines that are saturated with mine drainage. Where mercury mine drainage enters and first mixes with stream water, the addition of high concentrations of mercury and sulfate generates a favorable environment for methylation of mercury. Mixing of oxygenated stream water with mine drainage causes oxidation of dissolved iron(II) and precipitation of iron oxyhydroxide that accumulates in the streambed. Both mercury and methylmercury are strongly adsorbed onto iron oxyhydroxide over the p

  15. Below a Historic Mercury Mine: Non-linear Patterns of Mercury Bioaccumulation in Aquatic Organisms

    Science.gov (United States)

    Haas, J.; Ichikawa, G.; Ode, P.; Salsbery, D.; Abel, J.

    2001-12-01

    Unlike most heavy metals, mercury is capable of bioaccumulating in aquatic food-chains, primarily because it is methylated by bacteria in sediment to the more toxic methylmercury form. Mercury concentrations in a number of riparian systems in California are highly elevated as a result of historic mining activities. These activities included both the mining of cinnabar in the coastal ranges to recover elemental mercury and the use of elemental mercury in the gold fields of the Sierra Nevada Mountains. The most productive mercury mining area was the New Almaden District, now a county park, located in the Guadalupe River drainage of Santa Clara County, where cinnabar was mined and retorted for over 100 years. As a consequence, riparian systems in several subwatersheds of the Guadalupe River drainage are contaminated with total mercury concentrations that exceed state hazardous waste criteria. Mercury concentrations in fish tissue frequently exceed human health guidelines. However, the potential ecological effects of these elevated mercury concentrations have not been thoroughly evaluated. One difficulty is in extrapolating sediment concentrations to fish tissue concentrations without accounting for physical and biological processes that determine bioaccumulation patterns. Many processes, such as methylation and demethylation of mercury by bacteria, assimilation efficiency in invertebrates, and metabolic rates in fish, are nonlinear, a factor that often confounds attempts to evaluate the effects of mercury contamination on aquatic food webs. Sediment, benthic macroinvertebrate, and fish tissue samples were collected in 1998 from the Guadalupe River drainage in Santa Clara County at 13 sites upstream and downstream from the historic mining district. Sediment and macroinvertebrate samples were analyzed for total mercury and methylmercury. Fish samples were analyzed for total mercury as whole bodies, composited by species and size. While linear correlations of sediment

  16. A scientific approach to the characterization of the painting materials of Fra Mattia della Robbia polychrome terracotta altarpiece

    Science.gov (United States)

    Amadori, M. L.; Barcelli, S.; Casoli, A.; Mazzeo, R.; Prati, S.

    2013-12-01

    During the last restoration (2008-2011) of the polychrome terracotta altarpiece called Coronation of Virgin between Saints Rocco, Sebastian, Peter martyr and Antonio abbot, located in the collegiate church of S. Maria Assunta in Montecassiano (Macerata, Italy), scientific investigations were carried out to acquire detailed information about the painting technique. The identification of materials allowed a correct restoration. The altarpiece is almost entirely realized by Marco della Robbia (Fra Mattia), dates back to the first half of the XVI century and represents an interesting example of painted terracotta produced by using two different techniques: glazed polychrome terracotta and the "cold painting" technique. The characterization of the samples' material constituents was obtained by analysing the cross-sections and the fragments by different techniques (optical, SEM-EDS and ATR-FTIR microscopy as well as GC-MS), as the real nature of a component is often difficult to assess with one single technique. The optical microscope examination of paint cross-sections shows the presence of many layers, indicating the complexity of the paint stratigraphic morphologies. The original polychromy of della Robbia's masterpiece is constituted of cinnabar, red lake, red lead, orpiment, red ochre, lead white, lead tin yellow, green earth and raw umber. Two different types of gilding technique have been distinguished. The first one presents a glue mordant, and the second one shows an oil mordant composed by a mixture of red lead, red ochre, cinnabar and orpiment. The GC-MS analysis allowed the characterisation of linseed oil and a mixture of animal glue and egg as binding media stratigraphically located by the use of ATR-FTIR mapping microscopy. The analytical results of the painted terracotta integrated investigations show that original technique adopted is characterised by the application of pigments in an oil-binding medium directly applied on the substrates, probably treated

  17. The SALUT Project: Study of Advanced Laser Techniques for the Uncovering of Polychromed Works of Art

    Science.gov (United States)

    van der Snickt, G.; De Boeck, A.; Keutgens, K.; Anthierens, D.

    In order to find out whether the existing laser systems can be employed to remove superimposed layers of paint on secco wall paintings in a selective way, laser tests were carried out on three types of prepared samples simulating three stratigraphies that are frequently encountered in practice. OM, EPMA, colorimetry, μRaman, and FT-IR were used to evaluate the results. It was found that Q-switched Nd:YAG lasers emitting at 1,064nm could be employed to remove unwanted layers of oil paint and limewash, but the treatment of large areas requires implementation of a computer-controlled X-Y-Z station in order to control the parameters. However, the applicability of this technique will remain limited as ablation at the established optimum parameters implied a discoloration of the pigments cinnabar, yellow ochre, and burnt sienna. Moreover, it was observed that no ablation took place when the limewash thickness exceeds 25 μm. Unwanted layers of acrylic could be removed in an efficient way with an excimer laser emitting at 193 nm.

  18. Fungal-Induced Deterioration of Mural Paintings: In Situ and Mock-Model Microscopy Analyses.

    Science.gov (United States)

    Unković, Nikola; Grbić, Milica Ljaljević; Stupar, Miloš; Savković, Željko; Jelikić, Aleksa; Stanojević, Dragan; Vukojević, Jelena

    2016-04-01

    Fungal deterioration of frescoes was studied in situ on a selected Serbian church, and on a laboratory model, utilizing standard and newly implemented microscopy techniques. Scanning electron microscopy (SEM) with energy-dispersive X-ray confirmed the limestone components of the plaster. Pigments used were identified as carbon black, green earth, iron oxide, ocher, and an ocher/cinnabar mixture. In situ microscopy, applied via a portable microscope ShuttlePix P-400R, proved very useful for detection of invisible micro-impairments and hidden, symptomless, microbial growth. SEM and optical microscopy established that observed deterioration symptoms, predominantly discoloration and pulverization of painted layers, were due to bacterial filaments and fungal hyphal penetration, and formation of a wide range of fungal structures (i.e., melanized hyphae, chlamydospores, microcolonial clusters, Cladosporium-like conidia, and Chaetomium perithecia and ascospores). The all year-round monitoring of spontaneous and induced fungal colonization of a "mock painting" in controlled laboratory conditions confirmed the decisive role of humidity level (70.18±6.91% RH) in efficient colonization of painted surfaces, as well as demonstrated increased bioreceptivity of painted surfaces to fungal colonization when plant-based adhesives (ilinocopie, murdent), compared with organic adhesives of animal origin (bone glue, egg white), are used for pigment sizing.

  19. Modification by chloramphenicol of diethyl sulphate-induced male recombination frequency in Drosophila melanogaster.

    Science.gov (United States)

    Miglani, G S; Kaur, N P

    1995-06-01

    To study the effect of chloramphenicol (CPL, an inhibitor of protein synthesis) on diethyl sulphate (DES, a potent mutagen) induced male recombination frequency, the F1 (+/aristaless dumpy black cinnabar, al dp b cn) larvae of D. melanogaster were given a pre- or post-treatment of CPL with DES during the first or second half of larval life. In order to determine sensitivity of different germ cell stages to the induction and modification of male recombination frequency, five 3-day broods were taken from every F1 male. DES showed toxic effect on egg-to-adult development. DES was found to be a potent recombinogen. Several cases of non-reciprocal male recombination were recorded. The most frequent recombinant phenotype observed was b cn followed by cn and al. Majority of the recombinants appeared in clusters suggesting their pre-meiotic origin. DES produced male recombination at a stage where only primary spermatocytes were present in the larval testes. CPL when given as a pre- or post-treatment with DES revealed highest frequency of male recombination in broods that represented effect of treatment on spermatogonia predominantly. CPL enhanced the overall level of male recombination produced by DES in both pre- and post-treatments. The results suggested the role of protein synthesis in induction of male recombination in D. melanogaster. In addition, the present experiments give a methodology of enhancing the frequency of chemically-induced male recombination.

  20. Byzantine wall paintings from Kastoria, northern Greece: Spectroscopic study of pigments and efflorescing salts

    Science.gov (United States)

    Iordanidis, Andreas; Garcia-Guinea, Javier; Strati, Aggeliki; Gkimourtzina, Amalia; Papoulidou, Androniki

    2011-02-01

    This study concerns the investigation of pigments and efflorescence phenomena on the wall paintings of Kastoria, a rural, non-metropolitan Byzantine town. A large number of representative samples were collected from the murals of three churches, dated to post-Byzantine era (14th-17th c. AD). The identified pigments for the red colour were hematite (Fe 2O 3), cinnabar (HgS) and minium (Pb 3O 4), while brown and yellow colours were attributed to mixtures of ochres (Fe-oxides and hydroxides) and lime. The utilization of admixtures of iron, lead and mercury compounds was also attested in order to render specific tones on the painted surfaces. Black and dark blue hues were prepared using black carbon and Mn in some cases. Grey colours were assigned to a mixture of black carbon and lime. Green colour is rather attributed to admixtures of Fe-rich minerals and lime and not to the commonly used green earths. Baryte (BaSO 4) was also evidenced as a filler or extender. Phosphorous was detected and connected to proteinaceous material and Mo and Sb were traced which are probably affiliated to Fe-oxides. Regarding efflorescing salts, the determined compounds are: calcite, dolomite, gypsum, halite, nitratine, natron and mirabilite, all of which are related to temperature and humidity changes and moisture fluctuations inside the wall paintings.

  1. The Study of Mining Activities and their Influences in the Almaden Region Applying Remote Sensing Techniques; Estudio de la Influencia de las Actividades Mineras de Mercurio en la Comarca de Almaden Aplicando Tecnicas de Teledeteccion

    Energy Technology Data Exchange (ETDEWEB)

    Rico, C.; Schmid, T.; Millan, R.; Gumuzzio, J.

    2010-11-17

    This scientific-technical report is a part of an ongoing research work carried out by Celia Rico Fraile in order to obtain the Diploma of Advanced Studies as part of her PhD studies. This work has been developed in collaboration with the Faculty of Science at The Universidad Autonoma de Madrid and the Department of Environment at CIEMAT. The main objective of this work was the characterization and classification of land use in Almaden (Ciudad Real) during cinnabar mineral exploitation and after mining activities ceased in 2002, developing a methodology focused on the integration of remote sensing techniques applying multispectral and hyper spectral satellite data. By means of preprocessing and processing of data from the satellite images as well as data obtained from field campaigns, a spectral library was compiled in order to obtain representative land surfaces within the study area. Monitoring results show that the distribution of areas affected by mining activities is rapidly diminishing in recent years. (Author) 130 refs.

  2. Studies on subacute toxicity of Wansheng Huafeng Dan in rats%万胜化风丹对大鼠亚急性毒性的研究

    Institute of Scientific and Technical Information of China (English)

    彭芳; 杨虹; 吴芹; 刘杰; 时京珍

    2012-01-01

    Objective: To compare sub-acute toxic effects of cinnabar and Wansheng Huafeng Dan with mercury chloride and methyl-mercury. Method: Healthy SD rats were orally administered with Wansheng Huafeng Dan (0.42 g·kg-1), cinnabar (0. 15 g ·kg-1), HgS(0. 15g·kg-1), HgCl2(0.02g·kg-1'), MeHg (0.001 g·kg-1) and saline for 21 days under observed and then-weights were monitored. After the final administration, they were decapitated and their blood, liver, kidney and brain tissues were collected for calculating hepatic and renal indexes and detecting the contents of serum glutamic pyruvic rransamina.se, urea nitrogen and crealinine and the mercury accumulation in liver, kidney and brain tissues. Besides, relative expressions of liver metallothionein-1 (MT-1) and cytochrome P450 gene subtypes (Cyplal, Cyp2bl, Cyp2el, Cyp3a2, Cyp4alO) mRNA. Result: HgCl2 caused obvious weight lose in rats. Mercury contents in liver and kidney were markedly increased by HgClj and MeHg, and MeHg markedly increased mercury contents of brain either, but these advent effects were not notable in Wansheng Huafeng Dan and cinnabar groups. However, blood biochemistry and histopathology did not show significant changes in all groups. The expression of rat hepatic MT-1 mRNA was remarkably induced by both HgCl2 and MeHg. The expression of hepatic Cyp3a2 was increased by Wansheng Huafeng Dan and cinnabar, while the expression of Cyp2el was inhibited by HgCl2 and MeHg. Conclusion: The administration of Wansheng Huafeng Dan with equivalent dose for three weeks shows a much low sub-acute toxicity than HgCl2 and MeHg in rats.%目的:比较朱砂及万胜化风丹与氯化汞、甲基汞的亚急性毒性作用.方法:健康SD大鼠连续每天分别灌胃万胜化风丹(0.42 g·kg-1)、朱砂(0.15 g·kg-1)、硫化汞(0.15 g·kg-1)、氯化汞(0.02 g·kg-1)、甲基汞(0.001 g·kg-1),以及生理盐水21 d,观察大鼠一般情况,监测体重,于末次给药后断头取血、肝脏、肾脏和脑组织,计

  3. Residential mercury contamination in adobe brick homes in Huancavelica, Peru.

    Science.gov (United States)

    Hagan, Nicole; Robins, Nicholas; Hsu-Kim, Heileen; Halabi, Susan; Espinoza Gonzales, Ruben Dario; Richter, Daniel deB; Vandenberg, John

    2013-01-01

    This is the first study of adobe brick contamination anywhere in the world. Huancavelica, Peru is the site of historic cinnabar refining and one of the most mercury (Hg) contaminated urban areas in the world. Over 80% of homes in Huancavelica are constructed with adobe bricks made from Hg contaminated soil. In this study we measured total Hg concentrations in adobe brick, dirt floor, surface dust, and air samples from the interior of 60 adobe brick houses located in four neighborhoods. Concentrations of total Hg in adobe bricks, dirt floors, and surface dust ranged from 8.00 to 1070 µg/g, 3.06 to 926 µg/g, and 0.02 to 9.69 µg/wipe, respectively, with statistically significant differences between the four neighborhoods. Concentrations of Hg in adobe brick and dirt floor samples in Huancavelica were orders of magnitude higher than in Ayacucho, a non-mining town in Peru. A strong correlation exists between total Hg concentrations in adobe bricks and dirt floors which confirms that adobe bricks were being made on-site and not purchased from an off-site source. A strong correlation between surface dust and adobe bricks and dirt floors indicates that walls and floors serve as indoor sources of Hg contamination. Elemental Hg vapor concentrations were below detection (bricks, may be a substantial source of residential Hg exposure in silver or gold refining communities where Hg is produced or used for amalgamation in artisanal gold production.

  4. Characteristics of mercury-rich and extreme mercury-rich coals in the Donbas Region of Ukraine and Guizhou Province, China

    Energy Technology Data Exchange (ETDEWEB)

    Allan Kolker; Harvey E. Belkin [U.S. Geological Survey, Reston, VA (United States). Eastern Energy Resources Team

    2007-07-01

    Metal-enriched coals are present in the Donets Basin (Donbas), Ukraine, and in Guizhou Province, China, due to interaction, in the geologic past, of mineralizing fluids with coal-bearing sequences. Locally, this has resulted in extreme metal enrichment that poses a potential heath hazard where these coals are collected by local residents and used for domestic purposes. In the Donbas, coals with subppm to ppm mercury contents are produced commercially, whereas coals with tens of ppm mercury were formerly produced as a byproduct of a large-scale mercury extraction operation that remains publicly accessible. In Guizhou Province, small scale non-commercial mines have been worked for coals with extreme concentrations of mercury and arsenic. Commercial coals in Guizhou Province have much lower mercury contents, with average values not appreciably greater than in USA commercial coals. Samples from active Donbas coal mines show a good correlation between mercury content and pyritic sulfur, indicating that mercury occurs primarily as a trace constituent in iron sulfides. In extreme mercury-rich coals, mercury contents are higher than can be accounted for by substitution in iron sulfides, indicating that discrete mercury minerals such as cinnabar, tiemannite, and native mercury, are present. 13 refs., 3 figs.

  5. Mercury and trace element contents of Donbas coals and associated mine water in the vicinity of Donetsk, Ukraine

    Energy Technology Data Exchange (ETDEWEB)

    Kolker, Allan [U.S. Geological Survey, 956 National Center, Reston, VA 20192 (United States); Panov, Boris S.; Panov, Yuri B.; Korchemagin, Viktor A.; Shendrik, Tatiana [Department of Mineral Deposits and Ecological Geology, Donetsk National Technical University, Donetsk, 83000 (Ukraine); Landa, Edward R.; Conko, Kathryn M. [U.S. Geological Survey, 430 National Center, Reston, VA 20192 (United States); McCord, Jamey D. [U.S. Geological Survey, 973 Denver Federal Center, Denver, CO 80225 (United States)

    2009-08-01

    Mercury-rich coals in the Donets Basin (Donbas region) of Ukraine were sampled in active underground mines to assess the levels of potentially harmful elements and the potential for dispersion of metals through use of this coal. For 29 samples representing c{sub 11} to m{sub 3} Carboniferous coals, mercury contents range from 0.02 to 3.5 ppm (whole-coal dry basis). Mercury is well correlated with pyritic sulfur (0.01 to 3.2 wt.%), with an r{sup 2} of 0.614 (one outlier excluded). Sulfides in these samples show enrichment of minor constituents in late-stage pyrite formed as a result of interaction of coal with hydrothermal fluids. Mine water sampled at depth and at surface collection points does not show enrichment of trace metals at harmful levels, indicating pyrite stability at subsurface conditions. Four samples of coal exposed in the defunct open-cast Nikitovka mercury mines in Gorlovka have extreme mercury contents of 12.8 to 25.5 ppm. This coal was formerly produced as a byproduct of extracting sandstone-hosted cinnabar ore. Access to these workings is unrestricted and small amounts of extreme mercury-rich coal are collected for domestic use, posing a limited human health hazard. More widespread hazards are posed by the abandoned Nikitovka mercury processing plant, the extensive mercury mine tailings, and mercury enrichment of soils extending into residential areas of Gorlovka. (author)

  6. Mercury and trace element contents of Donbas coals and associated mine water in the vicinity of Donetsk, Ukraine

    Science.gov (United States)

    Kolker, A.; Panov, B.S.; Panov, Y.B.; Landa, E.R.; Conko, K.M.; Korchemagin, V.A.; Shendrik, T.; McCord, J.D.

    2009-01-01

    Mercury-rich coals in the Donets Basin (Donbas region) of Ukraine were sampled in active underground mines to assess the levels of potentially harmful elements and the potential for dispersion of metals through use of this coal. For 29 samples representing c11 to m3 Carboniferous coals, mercury contents range from 0.02 to 3.5 ppm (whole-coal dry basis). Mercury is well correlated with pyritic sulfur (0.01 to 3.2 wt.%), with an r2 of 0.614 (one outlier excluded). Sulfides in these samples show enrichment of minor constituents in late-stage pyrite formed as a result of interaction of coal with hydrothermal fluids. Mine water sampled at depth and at surface collection points does not show enrichment of trace metals at harmful levels, indicating pyrite stability at subsurface conditions. Four samples of coal exposed in the defunct open-cast Nikitovka mercury mines in Gorlovka have extreme mercury contents of 12.8 to 25.5 ppm. This coal was formerly produced as a byproduct of extracting sandstone-hosted cinnabar ore. Access to these workings is unrestricted and small amounts of extreme mercury-rich coal are collected for domestic use, posing a limited human health hazard. More widespread hazards are posed by the abandoned Nikitovka mercury processing plant, the extensive mercury mine tailings, and mercury enrichment of soils extending into residential areas of Gorlovka.

  7. Mercury. Yesterday, today, and tomorrow; Quecksilber gestern, heute, morgen. Mercury 'revisited' (ein letztes Wiedersehen mit Quecksilber)

    Energy Technology Data Exchange (ETDEWEB)

    Schweinsberg, Fritz

    2010-07-01

    Mercury (Hg) was known in the earliest recorded civilizations. Because of its special properties, it was used in fire-gilding, as a dye in the form of its brilliant red ore cinnabar, and for cosmetic and decorative products. Until modern times, Hg was used in crafts, as in the manufacture of mirrors, by hatters in the preparation of the felt, in photography, in instruments, e.g. clinical thermometer in agriculture to preserve wood (kyanization), as a fungicide in seed grain, as a catalyst in chemical plants, and at last in cosmetics and ritualistic uses. In medicine, the use of Hg is conflicting. For centuries, Hg and its compounds were applied in the treatment of syphilis, until penicillin was discovered. Particularly in the USA calomel (HG{sub 2}Cl{sub 2}) was used in high doses in 'heroic medicine' for different ailments. Calomel was also used in children in the treatment given for worms and in teething powders for half a century. Numerous children fell ill because of this treatment (Acrodynia), thousands died because of therapy. For thousands of years in traditional Asian herbal medicines Hg was added intentional and was also found as a contamination. (orig.)

  8. Collagen-based proteinaceous binder-pigment interaction study under UV ageing conditions by MALDI-TOF-MS and principal component analysis.

    Science.gov (United States)

    Romero-Pastor, Julia; Navas, Natalia; Kuckova, Stepanka; Rodríguez-Navarro, Alejandro; Cardell, Carolina

    2012-03-01

    This study focuses on acquiring information on the degradation process of proteinaceous binders due to ultra violet (UV) radiation and possible interactions owing to the presence of historical mineral pigments. With this aim, three different paint model samples were prepared according to medieval recipes, using rabbit glue as proteinaceus binders. One of these model samples contained only the binder, and the other two were prepared by mixing each of the pigments (cinnabar or azurite) with the binder (glue tempera model samples). The model samples were studied by applying Principal Component Analysis (PCA) to their mass spectra obtained with Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF-MS). The complementary use of Fourier Transform Infrared Spectroscopy to study conformational changes of secondary structure of the proteinaceous binder is also proposed. Ageing effects on the model samples after up to 3000 h of UV irradiation were periodically analyzed by the proposed approach. PCA on MS data proved capable of identifying significant changes in the model samples, and the results suggested different aging behavior based on the pigment present. This research represents the first attempt to use this approach (PCA on MALDI-TOF-MS data) in the field of Cultural Heritage and demonstrates the potential benefits in the study of proteinaceous artistic materials for purposes of conservation and restoration.

  9. Leather material found on a 6th B.C. Chinese bronze sword: A technical study

    Science.gov (United States)

    Luo, Wugan; Si, Yi; Wang, Hongmin; Qin, Ying; Huang, Fengchun; Wang, Changsui

    2011-09-01

    During July to November, 2006, an important archaeological excavation was conducted in Yun country, Hubei province, southern China. Chinese archaeologists found some remnant of leather materials, covered with red pigments, on a 6th century B.C. Chinese bronze sword. To understand the technology/ies that may have been utilized for manufacturing the leathers, a combined of Raman spectroscopy, FT-IR and XRF was thus applied to the remnant of leather materials. Raman analyses showed that red pigment on the leather was cinnabar (HgS). FT-IR and XRF analyses indicated that the content of some elements, such as Ca (existing as CaCO 3) and Fe (existing as Fe 2O 3), were much higher than those in the surrounding grave soil. The results inferred an application of lime depilation and retting, and the Fe-Al compound salt as tanning agent. And it was furthermore implicated that the Fe-Al salt tanning technique had been developed in the middle and late Spring and Autumn Period of China.

  10. Mercury speciation in the Mt. Amiata mining district (Italy): interplay between urban activities and mercury contamination

    Science.gov (United States)

    Rimondi, Valentina; Bardelli, Fabrizio; Benvenuti, Marco; Costagliola, Pilario; Gray, John E.; Lattanzi, Pierfranco

    2014-01-01

    A fundamental step to evaluate the biogeochemical and eco-toxicological significance of Hg dispersion in the environment is to determine speciation of Hg in solid matrices. In this study, several analytical techniques such as scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), sequential chemical extractions (SCEs), and X-ray absorption spectroscopy (XANES) were used to identify Hg compounds and Hg speciation in samples collected from the Mt. Amiata Hg mining district, southern Tuscany, Italy. Different geological materials, such as mine waste calcine (retorted ore), soil, stream sediment, and stream water suspended particulate matter were analyzed. Results show that the samples were generally composed of highly insoluble Hg compounds such as sulphides (HgS, cinnabar and metacinnabar), and more soluble Hg halides such as those associated with the mosesite group. Other moderately soluble Hg compounds, HgCl2, HgO and Hg0, were also identified in stream sediments draining the mining area. The presence of these minerals suggests active and continuous runoff of soluble Hg compounds from calcines, where such Hg compounds form during retorting, or later in secondary processes. Specifically, we suggest that, due to the proximity of Hg mines to the urban center of Abbadia San Salvatore, the influence of other anthropogenic activities was a key factor for Hg speciation, resulting in the formation of unusual Hg-minerals such as mosesite.

  11. Microbial isotopic signatures in calcareous tufa from Punta Mita coastal vents, Mexico

    Science.gov (United States)

    Canet, C.; Prol-Ledesma, R. M.; Melgarejo, J. C.; Reyes, A.

    2002-12-01

    Numerous small calcareous mounds accompanied by Ba, Hg and Tl mineralization occur in shallow submarine hydrothermal manifestations on the sea bottom, at 10 m depth, in Punta Mita (Western coast of Mexico). The formation of calcite mounds in these coastal vents provides an uncommon example of calcareous tufa deposits in a submarine hydrothermal environment. The hydrothermal activity consists in water and gas (essentially nitrogen and methane) venting at 85°C, through a 100 m fissure hosted in basaltic rocks and partially covered by unconsolidated sediments. The mounds consist of travertine-like metre-sized calcite aggregates that develop around the main submarine hot springs. Barite, sulphides (mostly pyrite and cinnabar) and phosphates (carbonate-hydroxylapatite) are also present in these mounds. Two main calcite types are texturally distinguished: firstly an earlier radial-fibrous generation, and a later fine-grained calcite generation that cements the detrital grains and fills the pore spaces. Stable isotope analyses were performed in calcite from these mounds. The δ13C measured values show a strong depletion in 13C, with values as low as -39.2 per mil (PDB). These values agree with a microbially mediated calcite mineralization process, by means of bacterial oxidation of vent derived methane. In contrast to most known cases of microbial methane oxidation, in Punta Mita this process took place under hydrothermal conditions.

  12. 万山地区风化环境中汞的活动行为探讨

    Institute of Scientific and Technical Information of China (English)

    花永丰

    1985-01-01

    Studies of supergenic dispersion, migration and enrichment of mercury and other elements in stratabound ore deposits are of great importance both in theory and in practice. In special reference to the Wanshan mercury ore deposit, this paper discussed the mechanism of supergenic migration Of mercury and its associated elements lead,sine, antimony, etc. In this paper the focus of the disoussion is placed on the existing forms of mercury, the rules governing the migration and the enrichment of.mercury and its associated elements in the process of weathering and some aspects of the simulating experiment on weathering of carbonates. Three existing forms of mercury are reeognized in carbonates: cinnabar minerals,isomorphs and inelusions, and ionic forms and adsorbed colloids. The migration of mercury together with its associated elements in the process of weathering follows the sequence : SiO2→Pb→Hg→Sb→Zn. The results of the simulating experiment on weathering of carbonates show that the products of weathering contsin more mercnry and associated elements than the original rocks.

  13. Microscopic partition of pressure and elastic constants in CdTe polymorphs

    Energy Technology Data Exchange (ETDEWEB)

    Ouahrani, T. [Laboratoire de Physique Théorique, Tlemcen University, 13000 Tlemcen (Algeria); École Préparatoire en Sciences et Techniques, 13000 Tlemcen (Algeria); Franco, R.; Menéndez, J.M.; Marqués, M. [MALTA Team and Departamento de Química Física y Analítica, Universidad de Oviedo, E-33006 Oviedo (Spain); Recio, J.M., E-mail: jmrecio@uniovi.es [MALTA Team and Departamento de Química Física y Analítica, Universidad de Oviedo, E-33006 Oviedo (Spain)

    2014-04-01

    Highlights: • Pressure ranges of stability of CdTe polymorphs are successfully computed. • A cubic B2 phase is predicted at pressures above 70 GPa. • Microscopic pressures are defined without resorting to energy partitions. • Cd shows a greater mechanical resistance than Te when pressure is applied. • Atomic equations of state are proposed for Cd and Te along the polymorphic sequence. - Abstract: Within the framework of density functional theory, first principles calculations were carried out to determine pressure stability ranges of zinc-blende (B3), cinnabar (Cinn), rock-salt (B1), orthorhombic (Cmcm), and cesium chloride (B2) phases of CdTe. In agreement with experimental observations, we found a B3→Cinn→B1→Cmcm pressure-induced sequence, and predict the B2 phase as a potential high pressure polymorph. The equations of state of all these polymorphs and the components of the elasticity tensor of the B3 phase at zero pressure were determined and microscopically analyzed in terms of atomic contributions. The concept of local pressure allows for quantifying differences in the role played by Cd and Te as regards the compressibility of CdTe phases, and suggests the existence of a general behavior under pressure for binary II–VI semiconductors.

  14. An estimation of mercury concentrations in the local atmosphere of Almadén (Ciudad Real Province, South Central Spain) during the twentieth century.

    Science.gov (United States)

    Tejero, José; Higueras, Pablo L; Garrido, Ignacio; Esbrí, José M; Oyarzun, Roberto; Español, Santiago

    2015-04-01

    We show the first estimations of long-term (100 years, 1900 to 2000) total gaseous mercury concentrations (TGM) in the urban area of Almadén. The estimation was carried out by comparing data on known metallic mercury production with measured TGM concentrations. The estimated diurnal background level ranges from 60 to 120 ng m(-3) and corresponds to periods when the metallurgical complex (cinnabar roasting plant) was shut down. The average TGM concentration during the period from 1900 to 2000 was about 600 ng m(-3) (with peaks above 1,200 ng m(-3)). Additionally, a 24-h-based TGM monitoring program has highlighted significant differences between the diurnal and nocturnal concentrations, particularly during the warmer months. In this regard, given that the average nocturnal to diurnal ratio is 2.12, we suggest that the average nocturnal concentrations must have exceeded 1,200 ng m(-3), and peak nocturnal concentrations could have reached levels up to 2,400 ng m(-3). Our estimations indicate that most parts of the town of Almadén were generally exposed to TGM concentrations in air that exceed the World Health Organization air quality guideline for Hg (1,000 ng m(-3)) for countryside and urban areas.

  15. Ocre y cinabrio en el registro funerario de El Argar

    Directory of Open Access Journals (Sweden)

    López Padilla, Juan A.

    2012-12-01

    Full Text Available The known cases of Bronze Age Argaric stained skeletons found in the Southeast of the Iberian Peninsula, have been analysed. The various hypotheses proposed relating to the origin of these colorations have been evaluated in light of new data provided by SEM, XRD and RAMAN spectroscopic analysis carried out on five Argaric graves of Murcia and Alicante. The results have indicated the presence of ochre and cinnabar on some of the skeletons. Without discarding the possibility that both substances were used in dyeing fabrics, it is proposed that their main use was for face and body make-up, being higher the number of recorded cases on female skeletons compared to male.

    Se analizan los casos de esqueletos con tinciones documentados en el ámbito argárico del Sudeste de la Península Ibérica. Se evalúan las diversas hipótesis planteadas hasta el momento en relación con el origen de estas coloraciones, tomando en consideración los análisis (SEM, XRD y espectroscopía RAMAN realizados en cinco tumbas argáricas de Murcia y Alicante que han determinado la presencia de ocre y cinabrio. Sin descartar su posible uso en el teñido de tejidos, se propone su empleo en el maquillaje facial y corporal, siendo mayor el número de casos registrados sobre esqueletos de mujeres que de hombres.

  16. Evolución del color en el alero de la fachada del rey D. Pedro I, Real Alcázar de Sevilla. Aportaciones del estudio de materiales a la identificación de las intervenciones de restauración a lo largo de su historia

    Directory of Open Access Journals (Sweden)

    López Cruz, Olimpia

    2011-12-01

    Full Text Available Results from the research carried out on the polychrome decoration of the façade of the King Pedro I Palace, which was built as part of the Alcázar of Seville between 1356 and 1366, are here explained. This building is regarded as one of the most important examples of architecture from al-Andalus in the Iberian Peninsula. The polychromy of its façade has been subject to numerous interventions throughout its history, but its general appearance remains largely unchanged, variations can be observed in details though. The predominant finishing has always been golden, on a background of reds, blues and greens. After an accuracy painstaking and sampling fieldwork, various laboratory techniques were brought together to identify and study the inorganic and organic phases that comprise the pictorial layers. Such techniques include optical microscopy with reflected and transmitted light, X-rays powder diffraction, scanning electron microscopy with EDX microanalysis, gas chromatography and high pressure liquid chromatography. At least eight polychrome decorations have been identified, corresponding to different levels carried out in different epochs. Each decoration has usually several layers: preparatory, base, and pictorial or golden foil layer, being the latter the most commonly used as finishing layer. The decorations use a wide variety of pigments: red lead, cinnabar/vermilion, lead white, natural and synthetic azurite, synthetic ultramarine, malachite, emerald green, As-Cu green, lead-tin yellow, chrome yellow, yellow litharge, and organic black. Detailed study of the textures and the precise characterization of the pigments used on the façade have enabled the successive interventions to be dated and their spatial correlation to be identified. Regarding the original pigments, remains of lead red and cinnabar were found, followed by layers of cinnabar/vermilion, azurite and malachite, these of natural origin. It was identified that in those

  17. Mercury distribution in an abandoned metallurgical plant

    Directory of Open Access Journals (Sweden)

    Millán R.

    2013-04-01

    Full Text Available The aim of the work is to evaluate the spatial distribution of Hg in the soil-plant system within an area where intense activity of Hg was dominant over a long period. An abandoned metallurgical plant from the 17th-18th centuries was chosen as the study area. It is situated in Almadenejos within the Almadén mining district (Spain that constitutes the largest and most unusual concentration of mercury in the world and has provided a third of the entire world production of mercury (Hg. Nowadays, this study area is covered with cinnabar mine tailings and village habitants use it for livestock. The area has elevated Hg concentrations of natural origin and from human activities. Soil parameters are similar throughout the study area; however, data reveal high variability in total and available Hg concentrations in soils, making it difficult to establish a tendency. Marrubium vulgare L.has been studied due to its high presence in the field plot, and there is no evidence of phenological toxicity. Furthermore, in spite of elevated Hg concentrations, a good biological activity is tested in the soil samples. All these characteristics, spatial variation, high Hg concentration, good biological activity, enhance the peculiarity of the study area for studies involving Hg.

  18. Effects of grinding-induced grain boundary and interfaces on electrical transportation and structure phase transition in ZnSe under high pressure

    Science.gov (United States)

    Jie, Yang; Pei, Wang; Guo-Zhao, Zhang; Xiao-Xue, Zhou; Jing, Li; Cai-Long, Liu

    2016-06-01

    Interface and scale effects are the two most important factors which strongly affect the structure and the properties of nano-/micro-crystals under pressure. We conduct an experiment under high pressure in situ alternating current impedance to elucidate the effects of interface on the structure and electrical transport behavior of two ZnSe samples with different sizes obtained by physical grinding. The results show that (i) two different-sized ZnSe samples undergo the same phase transitions from zinc blend to cinnabar-type phase and then to rock salt phase; (ii) the structural transition pressure of the 859-nm ZnSe sample is higher than that of the sample of 478 nm, which indicates the strong scale effect. The pressure induced boundary resistance change is obtained by fitting the impedance spectrum, which shows that the boundary conduction dominates the electrical transport behavior of ZnSe in the whole experimental pressure range. By comparing the impedance spectra of two different-sized ZnSe samples at high pressure, we find that the resistance of the 478-nm ZnSe sample is lower than that of the 859-nm sample, which illustrates that the sample with smaller particle size has more defects which are due to physical grinding. Project supported by the National Natural Science Foundation of China (Grant Nos. 11404133 and 11374121) and the Program of Science and Technology Development Plan of Jilin Province, China (Grant No. 20140520105JH).

  19. Microstructural study of pre hispanic and colonial pigments of diverse sites of Mexico; Estudio microestructural de pigmentos prehispanicos y coloniales de diversos sitios de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Arenas A, J. [IFUNAM, 04510 Mexico D.F. (Mexico); Espinosa P, M.; Fernandez, M.E.; Mondragon G, G.; Perez H, R.; Mendoza A, D. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Rodriguez L, V. [BUAP, A.P. J-48, 72540 Puebla (Mexico); Martinez, G. [INAH, 04000 Ex-Convento de Churubusco (Mexico)

    2004-07-01

    The aim of this work is to show some studies about the pre hispanic paintings, blue paint, green and red colors found in several archaeological sites located in the southeast and center of Mexico, also were analyzed clays samples from Sacalum mine localized in Yucatan state. The samples were analyzed by X Ray Diffraction (XRD), Scanning Electron Microscopy (Sem) and Transmission Electron Microscopy both equipped with a microprobe for chemical elemental analysis by Energy Dispersive Spectroscopy (EDS). The results obtained by Sem showed that all the pre hispanic paintings are made of fiber-like structures of micrometers order. In other zones of the samples were identified irregular morphologies in which the fibers are supported. The EDS analysis identified the elements C, O, Na, Mg, Al, Si, Ca and Fe. The XRD and High Resolution Transmission Electron Microscopy (HREM) results showed fiber crystalline structures at nanoscopic level corresponding to paligorskite clay. Other particles were identified as calcite phase. In the red pigments were identified paligorskite fibers in some of them and another sample was identified cinnabar phase. In these last sample no was identify the paligorskite. (Author) 14 refs., 13 figs.

  20. Immobilization of mercury by carboxymethyl cellulose stabilized iron sulfide nanoparticles: reaction mechanisms and effects of stabilizer and water chemistry.

    Science.gov (United States)

    Gong, Yanyan; Liu, Yuanyuan; Xiong, Zhong; Zhao, Dongye

    2014-04-01

    Iron sulfide (FeS) nanoparticles were prepared with sodium carboxymethyl cellulose (CMC) as a stabilizer, and tested for enhanced removal of aqueous mercury (Hg(2+)). CMC at ≥0.03 wt % fully stabilized 0.5 g/L of FeS (i.e., CMC-to-FeS molar ratio ≥0.0006). FTIR spectra suggested that CMC molecules were attached to the nanoparticles through bidentate bridging and hydrogen bonding. Increasing the CMC-to-FeS molar ratio from 0 to 0.0006 enhanced mercury sorption capacity by 20%; yet, increasing the ratio from 0.0010 to 0.0025 diminished the sorption by 14%. FTIR and XRD analyses suggested that precipitation (formation of cinnabar and metacinnabar), ion exchange (formation of Hg0.89Fe0.11S), and surface complexation were important mechanisms for mercury removal. A pseudo-second-order kinetic model was able to interpret the sorption kinetics, whereas a dual-mode isotherm model was proposed to simulate the isotherms, which considers precipitation and adsorption. High mercury uptake was observed over the pH range of 6.5-10.5, whereas significant capacity loss was observed at pH 106 mg/L) and organic matter (5 mg/L as TOC) modestly inhibited mercury uptake. The immobilized mercury remained stable when preserved for 2.5 years at pH above neutral.

  1. Impact of Mercury Mine Activities on Water Resources at Azzaba-North-East of Algeria

    Directory of Open Access Journals (Sweden)

    Fadila Alligui

    2010-01-01

    Full Text Available Problem statement: Mercury mineralization occurred in Azzaba (north-eastern Algeria as a part of mercurial Numidian belt, consists of numerous of Hg deposits (Koudiat Sma, Mrasma, Guenicha, Fendek, Ismail and Ras Elma. These deposits are hosted in a variety of lithologies including sandstone, limestone, breccias and conglomerate. The ores occur as cinnabar deposits in Ypresian-Lutetian formations. Although the quantity and type of information relating to mining operations within Azzaba remains insufficient and sparse an assessment of the impacts that mining and processing activities, have had or are likely to have, on water resources is required to describe the evidence of the origin and the extent Approach: 17 ground water samples were collected at different locations within the Hg mineralized area and analyzed to assess the source, degree and extent of the contamination. Results: The primary effect of mining is degradation of tens of kilometers of disturbed streams, thousands hectares of disturbed land including valuable ecosystems. chemical analysis showed that ground waters were also adversely affected by pollutants loading, the alluvial aquifer (composed primarily of silty sand and gravel that serves as the primary source of drinking water for Menzel Ben Dishe, Es-sebt and Zaouia communities surrounding Ismail mercury complex shows high concentrations of Hg and other heavy metals. Conclusion: These high values were associated and controlled by mixed origin with similar contribution from anthropogenic and geoginic sources.

  2. [In vitro safety evaluation study of Angong Niuhuang Wan].

    Science.gov (United States)

    Wang, Xin-mei; Zhang, Su; Wang, Mei-bo; Xia, Jing; Li, Li-min; Wang, Ke; Ji, Shen

    2015-01-01

    To study a vitro extraction method to determine soluble mercury and mercury species in Angong Niuhuang Wan and investigate a vitro safety evaluation method, the best extraction scheme was determined after a great deal of conditioning experiments focusing on how the solvent, purification, duration of extraction and purification etc impact on mercury extraction. Soluble mercury was determined by inductively coupled plasma mass spectrometry and mercury species were determined by high performance liquid chromatography/inductively coupled plasma mass spectrometry. Result show that the best extraction method of soluble mercury and its species was ultrasonic extraction in artificial intestinal juice at 37 °C for 2 hours, letting it stand for 20 hours and taking the supermatant. The method was reproducible, which could simulate the human body environment to maximum extent. Methyl mercury, ethyl mercury and Hg2+ were not found in the extracts of Angong Niuhuang, although the content of soluble mercury was high. It Was concluded that the method could be applied to the vitro extraction and determination of soluble mercury and mercury species in Chinese traditional medicines containing cinnabar. Methyl mercury, ethyl mercury and Hg2+ could be taken as the targets of in vitro safety evaluation of Angong Niuhuang.

  3. The Gutenberg Bibles: analysis of the illuminations and inks using Raman spectroscopy.

    Science.gov (United States)

    Chaplin, Tracey D; Clark, Robin J H; Jacobs, David; Jensen, Kristian; Smith, Gregory D

    2005-06-01

    The King George III copy of the Gutenberg Bible, held at the British Library, has been analyzed using Raman spectroscopy to determine the palette of pigments used in the illuminations on this work. The palette is found to comprise cinnabar/vermilion, lead tin yellow (type 1), carbon-based black, azurite, malachite, an organo-copper complex (a "verdigris"), calcium carbonate (chalk), gypsum, gold leaf, and basic lead carbonate ("lead white"). This is in agreement with contemporary descriptions of the pigments used for the illuminations. One pigment could not be identified, specifically the organic dark red/purple color used for the foliage. The palette of this copy of the Gutenberg Bible has been compared with those used for six other copies, held at Eton College and Lambeth Palace, England, the Bibliothèque Mazarine and the Bibliothèque nationale de France, and the Staatsbibliothek zu Berlin and the Niedersachsische Staats- und Universitatsbibliothek (SUB) Göttingen, Germany. The palettes are shown to be similar to one another, even though the styles of the primary illuminations differ. The two Gutenberg Bibles held in Germany, printed on vellum, have the more expensive palettes, which include lazurite. The SUB Göttingen copy has the most extensive palette with 16 pigment-related materials having been identified.

  4. How the masters in Umbria, Italy, generated and used nanoparticles in art fabrication during the Renaissance period

    Science.gov (United States)

    Padeletti, G.; Fermo, P.

    Lustre was one of the most sophisticated techniques for the decoration of majolicas during the Renaissance period. Lustre consists of a thin metallic film containing silver, copper and other substances like iron oxide and cinnabar applied in a reducing atmosphere on a previously glazed ceramic. In this way, beautiful iridescent reflections of different colours (in particular gold and ruby-red) are obtained. The characterisation and the study of lustre-decorated majolicas is of great interest for archaeologists, but also offers possibilities for producing pottery with outstanding decoration today, following ancient examples, since nowadays Italian artisans are interested in the reproduction of the ancient recipes and procedures. Moreover, it can even suggest new procedures for obtaining uniform thin metallic films for technological applications. A study has been carried out on ancient lustre layers using numerous different analytical techniques such as XRD, SEM-EDX, TEM-EDX-SAED, ETAAS, ICP-OES, UV-vis reflectance spectroscopy and SAXS. Lustre films were shown to be formed by copper and silver clusters of nanometric dimension. The colour and the properties of the lustre films depend on the elemental composition of the impasto applied to the ceramic surface as well as on other factors like the metallic nanocluster dimension, the firing conditions, the underlying glaze composition and the procedure used.

  5. Geological structure, composition of ores and age of the Bamsk gold deposit, Amur region, Russia

    Institute of Scientific and Technical Information of China (English)

    Vitaly A. Stepanov

    2004-01-01

    The Bamsk gold-ore deposit is located in the Amur region, the Far East of Russia. It is confined to the Early Cretaceous volcanic-plutonic uplift of central type, located in the Stanov folded-clumpy Pre-Cambrian system. The deposit is presented by a series of gold-bearing quartz and carbonate-quartz vein-stringer zones. They are confined to the super-intrusive zone of the Nevachansk subvolcanic intrusion of sienite-porphyric composition. The mineralization is being controlled by zone of fractures developed in the autochthone ofthe Bamsk fault. Quartz, carbonates and sericite prevail in the composition of ores. The quantity of ore minerals doesn't exceed 1%~5%. Pyrite, chalcopyrite, galena and native gold are widely spread. Sheelite, gold and silver tellurides, sulphobismuthites, acanthite, sphalerite and cinnabar are less developed. Four stages of mineralization have been distinguished. Gold-sulphide-sulphosalt ore with tellurides of gold and silver is productive for gold. The following set of elements is typomorphic for the ores of the deposit: Au, Ag, Cu, Bi,Mo, Pb and Sb (W1, Pb1, Mo) -Cu- (Ag, Bi, Sb, Mn, W1, Pb2) form the vertical series of zoning. Rocks, enclosing the mineralization are exposed to the processes of listvenitization-beresitization. The processes of gumbeization and argillization are less manifested. The age of the gold mineralization, determined by Rb-Sr method on ore-accompanying minerals, is 130.6 Ma.

  6. Nucleation of mercury sulfide by dealkylation

    Science.gov (United States)

    Enescu, Mironel; Nagy, Kathryn L.; Manceau, Alain

    2016-12-01

    Metal sulfide minerals are assumed to form naturally at ambient conditions via reaction of a metallic element with (poly)sulfide ions, usually produced by microbes in oxygen-depleted environments. Recently, the formation of mercury sulfide (β-HgS) directly from linear Hg(II)-thiolate complexes (Hg(SR)2) in natural organic matter and in cysteine solutions was demonstrated under aerated conditions. Here, a detailed description of this non-sulfidic reaction is provided by computations at a high level of molecular-orbital theory. The HgS stoichiometry is obtained through the cleavage of the S-C bond in one thiolate, transfer of the resulting alkyl group (R’) to another thiolate, and subsequent elimination of a sulfur atom from the second thiolate as a thioether (RSR’). Repetition of this mechanism leads to the formation of RS-(HgS)n-R chains which may self-assemble in parallel arrays to form cinnabar (α-HgS), or more commonly, quickly condense to four-coordinate metacinnabar (β-HgS). The mechanistic pathway is thermodynamically favorable and its predicted kinetics agrees with experiment. The results provide robust theoretical support for the abiotic natural formation of nanoparticulate HgS under oxic conditions and in the absence of a catalyst, and suggest a new route for the (bio)synthesis of HgS nanoparticles with improved technological properties.

  7. Raman spectroscopic signatures of the yellow and ochre paints from artist palette of J. Matejko (1838-1893)

    Science.gov (United States)

    Żmuda-Trzebiatowska, Iwona; Wachowiak, Mirosław; Klisińska-Kopacz, Anna; Trykowski, Grzegorz; Śliwiński, Gerard

    2015-02-01

    The Raman and complementary spectroscopic analyses were performed using the exceptional possibility of research on the XIX c. original paint materials of the artist palette of J. Matejko stored in the National Museum in Cracow. The yellow and ochre-based paints characteristic for Matejko's workshop and selected from the ensemble of 273 labelled tubes (brand of R. Ainé/Paris) supplied during the period of 1880-1893 were investigated. Highly specific Raman spectra were obtained for paints containing mixtures of the Zn- and Sn-modified Pb-Sb pigment, and also for the ochre-based ones. A clear pigment discrimination of the mixture of cadmium yellow (CdS), cinnabar (HgS) and lead white (2PbCO3ṡPb(OH)2) was possible by means of Raman data collected under different excitations at 514 nm and 785 nm. It was shown that the Raman spectra complemented by the XRF, SEM-EDX and in some cases also by the LIPS and FTIR data ensure reliable pigment identification in multi-component paints containing secondary species and impurities. The reported spectral signatures will be used for non-destructive investigation of the collection of about 300 oil paintings of J. Matejko. In view of the comparative research on polish painting which point out that richness of modified Naples yellows clearly distinguish Matejko's artworks from other ones painted in the period of 1850-1883, the Raman data of these paints can provide support in the authentication studies.

  8. Analysis of High-Resolution Spectra From a Hybrid Interferometric/Dispersive Spectrometer

    CERN Document Server

    Ko, P; Jovanovic, I

    2015-01-01

    To more fully take advantage of a low-cost, small footprint hybrid interferometric/dispersive spectrometer, a mathematical reconstruction technique was developed to accurately capture the high-resolution and relative peak intensities from complex spectral patterns. A Fabry-Perot etalon was coupled to a Czerny-Turner spectrometer, leading to increased spectral resolution by more than an order of magnitude without the commensurate increase in spectrometer size. Measurement of the industry standard Hg 313.1555/313.1844 nm doublet yielded a ratio of 0.682, which agreed well with an independent measurement and literature values. The doublet separation (29 pm) is similar to the U isotope shift (25 pm) at 424.437 nm that is of interest to monitoring nuclear nonproliferation activities. Additionally, the technique was applied to LIBS measurement of the mineral cinnabar (HgS) and resulted in a ratio of 0.682. This reconstruction method could enable significantly smaller, portable high-resolution instruments with isoto...

  9. 民国"烟台西公顺"票帖颜料无损分析%The Nondestructive Identification of Printing Pigments in Bank Notes Issued by YanTai XiGongShun,the Republic of China

    Institute of Scientific and Technical Information of China (English)

    施继龙; 穆艺; 张养志; 罗武干; 王荣; 方晓阳

    2010-01-01

    北京印刷学院印刷与包装工程学院印刷史研究室收藏"烟台西公顺"票帖两种,主体图案分别为红色、蓝色,长方形竖排版式,版心上方为"烟台西公顺"五字横排,下为竖排面值及流通区域、防伪千字文,其外一周为人物故事装饰画,用纸用墨考究,印刷异常精美.利用北京印刷学院印刷与包装工程学院拉曼光谱实验室XploRA显微共聚焦拉曼光谱仪对三种票帖印刷颜料进行无损分析,结果显示,红色颜料为朱砂(Cinnabar,HgS)、蓝色颜料为青金石(Lapis lazuli,(Na,Ca)4-8(AISiO_4)6(SO_4,S,Cl)1-2).

  10. In situ Raman spectroscopic study of marble capitals in the Alhambra monumental ensemble

    Science.gov (United States)

    Arjonilla, Paz; Domínguez-Vidal, Ana; de la Torre López, María José; Rubio-Domene, Ramón; Ayora-Cañada, María José

    2016-12-01

    The marble capitals of five different sites in the Alhambra complex (Granada, Spain), namely the Mexuar, the Hall of the Abencerrages, the Hall of the Kings, the Court of the Myrtles and the Court of the Main Canal, have been investigated. The decoration of the capitals exhibits mainly blue, red, black and gilding motifs with different states of conservation. The work has been carried out in situ by means of a portable Raman micro-spectrometer with an excitation laser of 785 nm. In addition to preserving the artwork with a non-invasive study, the on-site investigation gives a more representative knowledge of the art objects because the measurements are not limited to the samples that can be taken (few and small). The obtained Raman spectra were of good quality despite challenging adverse conditions out of the laboratory. Cinnabar, minium, carbon black, natural lapis lazuli and azurite were the main pigments found. Synthetic ultramarine blue was also detected in a capital as a result of a modern restoration. Degradation products as tin oxide in the gildings and weddellite in the preparation layers were also identified. All the results together with a careful visual inspection can be combined to elucidate the different execution techniques employed to apply the pigments on the marble substrate of the capitals in the Nasrid and Christian periods.

  11. Microchemical Study of Pigments and Binders in Polychrome Relics from Maiji Mountain Grottoes in Northwestern China.

    Science.gov (United States)

    Liu, Luyao; Shen, Wei; Zhang, Bingjian; Ma, Qian

    2016-08-01

    In this study, an integrated analytical method was developed to investigate the composition of both the inorganic pigments and organic binders of polychrome relics in Maiji Mountain Grottoes in northwestern China. Cross-sections of each sample were prepared at the beginning of the study, and all experiments were carried out on these cross-sections. Polychromic structures were revealed by optical microscopy and scanning electron microscopy-backscattered electron imaging. Inorganic materials were determined by using SEM coupled with an energy dispersive spectrometer and μ-Raman spectrometer, whereas organic materials were identified by staining techniques and highly sensitive and specific immunofluorescence microscopy. Data showed that the red colors are attributed to one or two pigments of red ochre, cinnabar, and minium; the blue pigment is natural lazurite; the green pigment is ascribed to atacamite; the white color is attributed to potassium feldspar; and the black surface is formed by the discoloration of minium to plattnerite under the influence of environmental factors. Regarding organic binders used in painting and preparation layers, mammalian animal glue and chicken egg white were both found alone or in mixture. Finally, the conclusion is made that the Secco technique is employed in polychrome relics from Maiji Mountain Grottoes.

  12. Transportation and transformation of mercury in a calcine profile in the Wanshan Mercury Mine, SW China.

    Science.gov (United States)

    Yin, Runsheng; Gu, Chunhao; Feng, Xinbin; Zheng, Lirong; Hu, Ningning

    2016-12-01

    Calcination of Hg ores has resulted in serious contamination of mercury (Hg) in the environment. To understand the mobilization of Hg in the calcine pile, the speciation of Hg in a profile of a large calcine pile in the Wanshan Mercury Mine, SW China was investigated using the X-ray absorption spectroscopy (XANES), to understand the mobilization of Hg in the calcine pile. Higher concentrations of Hg were observed at the 30-50 cm depth of the profile, corresponding to a cemented layer. This layer is observed in the entire pile, and was formed due to cementation of calcines. Hg species in calcines include cinnabar (α-HgS), metacinnabar (β-HgS), elemental Hg(0), and minor mercuric chloride (HgCl2), but these Hg species show dramatic changes in the profile. Variations in Hg speciation suggest that extensive mobilization of Hg can occur during weathering processes. We show that the cemented layer can prevent the leaching of Hg and the emission of Hg(0) from the pile. High MeHg concentrations were found near the cemented layer, indicating Hg methylation occurs. This study provides important insights into the environmental risk of Hg in mining areas.

  13. SEM/EDS analysis of soil and roasting vessels fragments from ancient mercury ore roasting sites at Idrija area

    Directory of Open Access Journals (Sweden)

    Tamara Teršič

    2011-06-01

    Full Text Available Numerous roasting vessels fragments can be found at ancient roasting site areas in the surroundings of Idrija town, which were used for ore roasting in the first 150 years of Hg production in Idrija. The earthen vessels fragments lay just below the surface humus layer and in some parts they stretch more than 1 meter deep; they arecovered with red (cinnabar or black (metacinnabar coatings.SEM/EDS analysis of roasting vessels fragments and soil samples from roasting site areas P{enk and Frbejžene trate was performed in order to characterize the solid forms of Hg in applied sampling material. Mercuric sulphide HgS was found to be the main mercury compound present in the samples. Analysis of earthen vessels fragmentsshowed abundant HgS coatings on the surface of ceramics, forming either crust-like aggregates on matrix or isolated grains. Some well-shaped grains with indicated structure and the size of up to 200 μm could also be observed. In soil HgS was present as powder-like concentrations scattered in soil samples, frequently coating silicate and quartz crystals and clay-minerals. Polycristalline, mercury- and sulphur- rich particles comprising silica, clay mineralsand Al-, Fe- and Mg-oxides that were also observed in the samples were interpreted as soil aggregates infiltrated by mercuric and sulphur vapours and by liquid mercury spilled during roasting. These particles suggest a possible presence of mercury-sulphur associations other than HgS.

  14. Applicability of the Mercury Controlled Volatilization Technique in the Cerco Minero de Almadenejos; Aplicabilidad de Tecnicas de Volatilizacion Controlada de Mercurio en el Cerco Minero de Almadenejos

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, L.; Sierra, M. J.; Millan, R.

    2013-02-01

    This work study the case of the Cerco Minero de Almadenejos (Ciudad Real), that is an important archaeological mine site in the region. In this place, different contamination levels can be finding in the soil and installations. The recovery of this site it will be of interest for the socio-economic development of the area. A preliminary study of the site has been carried out, in order to evaluate the possibility of the application of an in situ controlled mercury volatilization process as an alternative remediation technique. In case of reaching the established legal mercury levels, it could be possible to change the land use of the site. The proposed methodology includes the possibility of control the time required for a complete treatment as a function of the initial contamination level, in this way, the soil and installations decontamination process is performed by a non-destructive way. Finally, the proposed technology respects the old metallurgical plant where cinnabar was treated and burned, having the furnaces an elevated historical value whose restoration and conservation is important for the future use of the site. (Author) 20 refs.

  15. Mercury and trace element fractionation in Almaden soils by application of different sequential extraction procedures

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, D.M.; Quejido, A.J.; Fernandez, M.; Hernandez, C.; Schmid, T.; Millan, R.; Gonzalez, M.; Aldea, M.; Martin, R.; Morante, R. [CIEMAT, Madrid (Spain)

    2005-04-01

    A comparative evaluation of the mercury distribution in a soil sample from Almaden (Spain) has been performed by applying three different sequential extraction procedures, namely, modified BCR (three steps in sequence), Di Giulio-Ryan (four steps in sequence), and a specific SEP developed at CIEMAT (six steps in sequence). There were important differences in the mercury extraction results obtained by the three procedures according to the reagents applied and the sequence of their application. These findings highlight the difficulty of setting a universal SEP to obtain information on metal fractions of different mobility for any soil sample, as well as the requirement for knowledge about the mineralogical and chemical characteristics of the samples. The specific six-step CIEMAT sequential extraction procedure was applied to a soil profile (Ap, Ah, Bt1, and Bt2 horizons). The distribution of mercury and major, minor, and trace elements in the different fractions were determined. The results indicate that mercury is mainly released with 6 M HCl. The strong association of mercury with crystalline iron oxyhydroxides, present in all the horizons of the profile, and/or the solubility of some mercury compounds in such acid can explain this fact. Minor mercury is found in the fraction assigned to oxidizable matter and in the final insoluble residue (cinnabar). (orig.)

  16. [Mercury--a major agent in the history of medicine and alchemy].

    Science.gov (United States)

    Norn, Svend; Permin, Henrik; Kruse, Edith; Kruse, Poul R

    2008-01-01

    From ancient time the history of mercury has been connected with that of the medicine and chemistry. Mercury therefore contributes to the history of science throughout times. Knowledge of cinnabar (HgS) is traced back to ancient Assyria and Egypt, but also to China. The Greek philosophers were the initiators of theoretical science. The idea of the four elements, earth, air, water and fire, was introduced mainly by Empedocles and Aristotle in the 5th and 4th century BC. The theory encouraged the hope of transmuting metal to gold. The early development of practical alchemy is obscure, but some hints are given in the encyclopedia compiled by Zosimos about 300 A.D. in Alexandria. It also includes the invention of equipment such as stills, furnaces and heating baths. Medical treatment is described by Pliny and Celsus, e.g. the use of cinnabar in trachoma and venereal diseases. When the Arabs learned Greek alchemy by the Nestorians, they introduced or improved chemical equipments and new chemicals were obtained such as sublimate (HgCl2), different salts, acids, alkaline carbonates and metal oxides. The first recorded account of animal experimentation on the toxicity of mercury comes from Rhazes (al-Razi) in the 9th century and in the 11th century Avicenna (Ibn Sina) had the foresight to recommend the use of mercury only as an external remedy, and quicksilver ointments were used by the Arabs in the treating of skin diseases. In the medieval west scientific experiments were forbidden since the interpretation of the world order should not be changed. Greek and Arabic medicine and alchemy were therefore authoritative and the breakthrough in scientific inventions first appeared after the introduction of the Renaissance. The Renaissance medicine included ancient medicine as well as "modern medicine", based on iatrochemistry, and this chemical approach was introduced by Paracelsus. The medicine included sulphur and salts or oxides of for instance mercury, copper, iron, antimony

  17. Arsenic pollution and fractionation in sediments and mine waste samples from different mine sites

    Energy Technology Data Exchange (ETDEWEB)

    Larios, Raquel; Fernandez-Martinez, Rodolfo [Unidad de Espectroscopia, Division de Quimica, Departamento de Tecnologia, CIEMAT. Av. Complutense, 40, E-28040 Madrid (Spain); Alvarez, Rodrigo [Dpto. de Explotacion y Prospeccion de Minas, Universidad de Oviedo, ETS de Ingenieros de Minas, C/Independencia, 13, E-33004 Oviedo (Spain); Rucandio, Isabel, E-mail: isabel.rucandio@ciemat.es [Unidad de Espectroscopia, Division de Quimica, Departamento de Tecnologia, CIEMAT. Av. Complutense, 40, E-28040 Madrid (Spain)

    2012-08-01

    A characterization of arsenic pollution and its associations with solid mineral phases in sediments and spoil heap samples from four different abandoned mines in Spain is performed. Three of them were mercury mines located in the same mining district, in the province of Asturias, and the other one, devoted to arsenic mining, is in the province of Leon. A sequential extraction procedure, especially developed for arsenic, was applied for the study of arsenic partitioning. Very high total arsenic concentrations ranging 300-67,000 mg{center_dot}kg{sup -1} were found. Arsenic fractionation in each mine is broadly in accordance with the mineralogy of the area and the extent of the mine workings. In almost all the studied samples, arsenic appeared predominantly associated with iron oxyhydroxides, especially in the amorphous form. Sediments from cinnabar roasted piles showed a higher arsenic mobility as a consequence of an intense ore treatment, posing an evident risk of arsenic spread to the surroundings. Samples belonging to waste piles where the mining activity was less intense presented a higher proportion of arsenic associated with structural minerals. Nevertheless, it represents a long-term source of arsenic to the environment. - Highlights: Black-Right-Pointing-Pointer Arsenic fractionation in sediments from different mining areas is evaluated. Black-Right-Pointing-Pointer A sequential extraction scheme especially designed for arsenic partitioning is applied. Black-Right-Pointing-Pointer As associations with mineral pools is in accordance to the mineralogy of each area. Black-Right-Pointing-Pointer As distribution and mobility in each area depends on the extent of mining activity. Black-Right-Pointing-Pointer As occurs mainly associated with amorphous iron oxyhydroxides in all samples.

  18. Mercury in the sediments of the Marano and Grado Lagoon (northern Adriatic Sea): Sources, distribution and speciation

    Science.gov (United States)

    Acquavita, Alessandro; Covelli, Stefano; Emili, Andrea; Berto, Daniela; Faganeli, Jadran; Giani, Michele; Horvat, Milena; Koron, Neža; Rampazzo, Federico

    2012-11-01

    The existence of mining tailings in Idrija (Slovenia) and their subsequent transportation via the Isonzo River has been the primary source of mercury (Hg) in the northern Adriatic Sea for almost 500 years, making the Gulf of Trieste and the adjacent Marano and Grado Lagoon two of the most contaminated marine areas in the world. A further, more recent, contribution of Hg has been added by the operation of a chlor-alkali plant (CAP) located in the drainage basin flowing into the Lagoon. On the basis of previous research, as well as new data obtained from the "MIRACLE" project (Mercury Interdisciplinary Research for Appropriate Clam farming in a Lagoon Environment), the spatial distribution of Hg and its relationships with methylmercury (MeHg), organic matter and several geochemical parameters in surface sediments were investigated. The predominant and long-term impacts of the cinnabar-rich Isonzo River particulate matter in the Lagoon surface sediments are evident and confirmed by a decreasing concentration gradient from east (>11 μg g-1) to west (0.7 μg g-1). Hg originated from the CAP is only significant in the central sector of the Lagoon. Hg is primarily associated with fine-grained sediments (production. In the context of the potential hazard of Hg and MeHg accumulation in reared clams, the choice of a site for the extension of farming activities inside the Marano and Grado Lagoon is dependent on several factors and cannot be decided solely on the basis of the total Hg content in the sediment.

  19. On Saozi Noodle, Toad Butter and the Chinese Character"de"%(月肃)子面、蟾酥及“的”字三议

    Institute of Scientific and Technical Information of China (English)

    韩健畅

    2012-01-01

    "臊子面"应为"(月肃)子面",这可以从许多古籍记载中看得出来。蟾酥的制作通常是于夏秋捕捉癞蛤蟆,后去内脏,撑开晒干,用瓷匙刮癞蛤蟆的表面,促使其分泌浆液,再盛于瓷器内,干燥后就称为蟾酥。上古至清,"的"字的含义指姬妾宫人来了月经,不用口说,以红色丹砂、胭脂或其它红、绛、玄、蛾黄色颜料点在额中,意即避开房事。%"Saozi Noodle"should have been written in another way,which can be seen from many ancient books.The making of toad butter usually begins with summer and autumn when people try to catch a toad,gut it and air its dead body.Afterward the surface of toad is to be scraped with a porcelain spoon for the secreting of thick liquid to be put in a porcelain vessel.Wait until it is dried when it is called toad butter.Ever since antiquity,the meaning of"de"refers to the menstruation period of concubines and people in the imperial court.When this happens,the females don’t have to tell but put a dot made up of red cinnabar,rouge or other colors such as red,purple,black or yellow,which indicates the avoidance of having sexual intercourse.

  20. Residential mercury contamination in adobe brick homes in Huancavelica, Peru.

    Directory of Open Access Journals (Sweden)

    Nicole Hagan

    Full Text Available This is the first study of adobe brick contamination anywhere in the world. Huancavelica, Peru is the site of historic cinnabar refining and one of the most mercury (Hg contaminated urban areas in the world. Over 80% of homes in Huancavelica are constructed with adobe bricks made from Hg contaminated soil. In this study we measured total Hg concentrations in adobe brick, dirt floor, surface dust, and air samples from the interior of 60 adobe brick houses located in four neighborhoods. Concentrations of total Hg in adobe bricks, dirt floors, and surface dust ranged from 8.00 to 1070 µg/g, 3.06 to 926 µg/g, and 0.02 to 9.69 µg/wipe, respectively, with statistically significant differences between the four neighborhoods. Concentrations of Hg in adobe brick and dirt floor samples in Huancavelica were orders of magnitude higher than in Ayacucho, a non-mining town in Peru. A strong correlation exists between total Hg concentrations in adobe bricks and dirt floors which confirms that adobe bricks were being made on-site and not purchased from an off-site source. A strong correlation between surface dust and adobe bricks and dirt floors indicates that walls and floors serve as indoor sources of Hg contamination. Elemental Hg vapor concentrations were below detection (<0.5 µg/m(3 in most homes; however in homes with detectable levels, concentrations up to 5.1 µg/m(3 were observed. No statistically significant differences in Hg vapor measurements were observed between neighborhoods. This study demonstrates that building materials used widely in developing communities, such as adobe bricks, may be a substantial source of residential Hg exposure in silver or gold refining communities where Hg is produced or used for amalgamation in artisanal gold production.

  1. Residential Mercury Contamination in Adobe Brick Homes in Huancavelica, Peru

    Science.gov (United States)

    Hagan, Nicole; Robins, Nicholas; Hsu-Kim, Heileen; Halabi, Susan; Espinoza Gonzales, Ruben Dario; Richter, Daniel deB.; Vandenberg, John

    2013-01-01

    This is the first study of adobe brick contamination anywhere in the world. Huancavelica, Peru is the site of historic cinnabar refining and one of the most mercury (Hg) contaminated urban areas in the world. Over 80% of homes in Huancavelica are constructed with adobe bricks made from Hg contaminated soil. In this study we measured total Hg concentrations in adobe brick, dirt floor, surface dust, and air samples from the interior of 60 adobe brick houses located in four neighborhoods. Concentrations of total Hg in adobe bricks, dirt floors, and surface dust ranged from 8.00 to 1070 µg/g, 3.06 to 926 µg/g, and 0.02 to 9.69 µg/wipe, respectively, with statistically significant differences between the four neighborhoods. Concentrations of Hg in adobe brick and dirt floor samples in Huancavelica were orders of magnitude higher than in Ayacucho, a non-mining town in Peru. A strong correlation exists between total Hg concentrations in adobe bricks and dirt floors which confirms that adobe bricks were being made on-site and not purchased from an off-site source. A strong correlation between surface dust and adobe bricks and dirt floors indicates that walls and floors serve as indoor sources of Hg contamination. Elemental Hg vapor concentrations were below detection (<0.5 µg/m3) in most homes; however in homes with detectable levels, concentrations up to 5.1 µg/m3 were observed. No statistically significant differences in Hg vapor measurements were observed between neighborhoods. This study demonstrates that building materials used widely in developing communities, such as adobe bricks, may be a substantial source of residential Hg exposure in silver or gold refining communities where Hg is produced or used for amalgamation in artisanal gold production. PMID:24040399

  2. Mercury and methylmercury contents in mine-waste calcine, water, and sediment collected from the Palawan Quicksilver mine, Philippines

    Science.gov (United States)

    Gray, J.E.; Greaves, I.A.; Bustos, D.M.; Krabbenhoft, D.P.

    2003-01-01

    The Palawan Quicksilver mine, Philippines, produced about 2,900 t of mercury during mining of cinnabar ore from 1953 to 1976. More than 2,000,000 t of mine-waste calcines (retorted ore) were produced during mining, much of which were used to construct a jetty in nearby Honda Bay. Since 1995, high Hg contents have been found in several people living near the mine, and 21 of these people were treated for mercury poisoning. Samples of mine-waste calcine contain high total Hg concentrations ranging from 43-660 ??g/g, whereas total Hg concentrations in sediment samples collected from a mine pit lake and local stream vary from 3.7-400 ??g/g. Mine water flowing through the calcines is acidic, pH 3.1-4.3, and total Hg concentrations ranging from 18-31 ??g/l in this water significantly exceed the 1.0-??g/l drinking water standard for Hg recommended by the World Health Organization (WHO). Total Hg contents are generally lower in water samples collected from surrounding domestic wells, the mine pit lake, Honda Bay, and the nearby stream, varying from 0.008-1.4 ??g/l. Methylmercury concentrations in water draining mine calcines range from <0.02-1.4 ng/l, but methylmercury is highest in the pit lake water, ranging from 1.7-3.1 ng/l. Mercury methylation at the Palawan mine is similar to or higher than that found in other mercury mines worldwide. Much of the methylmercury generated in Palawan mine-waste calcines and those in Honda Bay is transferred to water, and then to marine fish and seafood. A food source pathway of Hg to humans is most likely in this coastal, high fish-consuming population.

  3. Natural and anthropogenic variations in atmospheric mercury deposition during the Holocene near Quelccaya Ice Cap, Peru

    Science.gov (United States)

    Beal, Samuel A.; Kelly, Meredith A.; Stroup, Justin S.; Jackson, Brian P.; Lowell, Thomas V.; Tapia, Pedro M.

    2014-04-01

    Mercury (Hg) is a toxic metal that is transported globally through the atmosphere. Emissions of Hg from mineral reservoirs and recycling between soil/biomass, oceans, and the atmosphere are fundamental to the global Hg cycle, yet past emissions from anthropogenic and natural sources are not fully constrained. We use a sediment core from Yanacocha, a headwater lake in southeastern Peru, to study the anthropogenic and natural controls on atmospheric Hg deposition during the Holocene. From 12.3 to 3.5 ka, Hg fluxes in the record are relatively constant (mean ± 1σ: 1.4 ± 0.6 µg m-2 a-1). Past Hg deposition does not correlate with changes in regional temperature and precipitation or with most large volcanic events that occurred regionally (~300-400 km from Yanacocha) and globally. In 1450 B.C. (3.4 ka), Hg fluxes abruptly increased and reached the Holocene-maximum flux (6.7 µg m-2 a-1) in 1200 B.C., concurrent with a ~100 year peak in Fe and chalcophile metals (As, Ag, Tl) and the presence of framboidal pyrite. Continuously elevated Hg fluxes from 1200 to 500 B.C. suggest a protracted mining-dust source near Yanacocha that is identical in timing to documented pre-Incan cinnabar mining in central Peru. During Incan and Colonial time (A.D. 1450-1650), Hg deposition remains elevated relative to background levels but lower relative to other Hg records from sediment cores in central Peru, indicating a limited spatial extent of preindustrial Hg emissions. Hg fluxes from A.D. 1980 to 2011 (4.0 ± 1.0 µg m-2 a-1) are 3.0 ± 1.5 times greater than preanthropogenic fluxes.

  4. Influence of the addition of fertilizers and organic matter amendment on mercury contaminated soil; Influencia de la adicion de fertilizantes y enmendantes organicos en suelos contaminados de mercurio

    Energy Technology Data Exchange (ETDEWEB)

    Carrasco, S.; Millan, R.

    2008-07-01

    The objective of this work was to evaluate the mercury mobilization in a soil where fertilizers and organic matter were added. The study was carried out using a soil from the mercury mining district of Almaden (Spain). This area constitutes the largest and most unusual concentration of mercury in the World. The soil has been classified as an Alfisol Xeralf Haploxeral (USDA taxonomy), and the total mercury content is 14,16 0,65 mg kg-1in average. The experimental work was performed in 1 L glass columns filled with 500 g of soil. It was carried out 3 different treatments. The fi rst one, a NPK fertilizer (15:15:15) that was applied at three different doses (recommended dose -by farmers, half recommended dose and double recommended dose). The second one, a peat (Sphagnum) with a ph between 5,5-7, and the third one, a liquid organic amendment (Molex). The experimental work was carried out using 21 columns in total, where 3 of them were used as a control (C). During ten consecutive weeks, the columns were irrigated with distilled water (150 ml) once a week. The contact time was two days; after that, the leachates were collected and filtered. Finally, the soil contained in glass columns at soil fi eld capacity was centrifuged to get the wilting point. Mercury was determined using an Advanced Mercury Analyzer (AMA-254). Results show that mercury content in all samples was under detection limit (0,5 {mu}g L-1). It is according to the fact that mercury is mainly in a cinnabar form, which had a very low solubility. The addition of fertilizers and organic matter amendment do not increase the mercury content in the leachates either in the soil solution. (Author) 102 refs.

  5. A laboratory based experimental study of mercury emission from contaminated soils in the River Idrijca catchment

    Directory of Open Access Journals (Sweden)

    D. Kocman

    2010-02-01

    Full Text Available Results obtained by a laboratory flux measurement system (LFMS focused on investigating the kinetics of the mercury emission flux (MEF from contaminated soils of the Idrija Hg-mine region, Slovenia are presented. Representative soil samples with respect to total Hg concentrations (4–417 μg g−1 and land cover (forest, meadow and alluvial soil alongside the River Idrijca were analysed to determine the variation in MEF versus distance from the source, regulating three major environmental parameters comprising soil temperature, soil moisture and solar radiation. MEFs ranged from less than 2 to 530 ng m−2 h−1, with the highest emissions from contaminated alluvial soils and soils near the mining district in the town of Idrija. A significant decrease of MEF was then observed with increasing distance from these sites. The results revealed a strong positive effect of all three parameters investigated on momentum MEF. The light-induced flux was shown to be independent of the soil temperature, while the soil aqueous phase seems to be responsible for recharging the pool of mercury in the soil available for both the light- and thermally-induced flux. The overall flux response to simulated environmental conditions depends greatly on the form of Hg in the soil. Higher activation energies are required for the overall process to occur in soils where insoluble cinnabar prevails compared to soils where more mobile Hg forms and forms available for transformation processes are dominant.

  6. Study of Hydrothermal Particulate Matter from a Shallow Venting System, offshore Nayarit, Mexico

    Science.gov (United States)

    Ortega-Osorio, A.; Prol-Ledesma, R. M.; Reyes, A. G.; Rubio-Ramos, M. A.; Torres-Vera, M. A.

    2001-12-01

    A shallow (30 ft) hydrothermal site named ``Cora'' (after the indigenous people thereby) was surveyed and sampled throughout direct observation with SCUBA diving during November 25 to December 4, 2000. A total of 10 dives were conducted in order to obtain representative samples from an 85oC fluid source of approximately 10 cm in diameter. Inherent difficulties to the sampling, such as poor visibility and strong bottom currents were overcome and samples of hydrothermal fluid, gas, rocks, and particulate matter were collected directly from the vent. Water samples and hydrothermal fluid were taken with a homemade 1 l cylindrical bottles of two lines by flushing in from the bottom for about ten minutes until total displacement of the seawater; similar procedure was carried out for gas samples. Particulate matter was collected with 0.4mm polycarbonate membrane filters and preserved in a desiccators at a fridge temperature until analysis onshore. Preliminary description of the rock samples suggest that pyritization is the main mineralisation process. Filters containing hydrothermal particulate matter were surveyed under the scanning electron microscope in order to identify the nature (inorganic and organic), as well as the chemistry of the particles. SEM examination revealed the presence of particles of different kind that suggests high degree of mixing and re-suspension: Planctonic organisms and organic matter appeared to be abundant; 25 micron particles of different carbonate faces and inorganic particles of silicates were also recognized. Distinctive euhedral colloidal grains were identified as the resulting process of precipitation from the solution. Microanalysis of iron and sulfur content of 10 micron particles indicate a very likely sulphide mineral face (greigite); 8 micron cinnabar particles are consistent with the mineralization conditions, observed as well in the inner walls of the vent. Analyses of dissolved and particulate trace metals are still ongoing at

  7. Mercury transfer from soil to olive trees. A comparison of three different contaminated sites.

    Science.gov (United States)

    Higueras, Pablo L; Amorós, José Á; Esbrí, José Maria; Pérez-de-los-Reyes, Caridad; López-Berdonces, Miguel A; García-Navarro, Francisco J

    2016-04-01

    Mercury contents in soil and olive tree leaves have been studied in 69 plots around three different source areas of this element in Spain: Almadén (Ciudad Real), Flix (Tarragona) and Jódar (Jaén). Almadén was the world's largest cinnabar (HgS) mining district and was active until 2003, Flix is the oldest Spanish chlor-alkali plant (CAP) and has been active from 1898 to the present day and Jódar is a decommissioned CAP that was active for 14 years (1977-1991). Total mercury contents have been measured by high-frequency modulation atomic absorption spectrometry with Zeeman effect (ZAAS-HFM) in the soils and olive tree leaves from the three studied areas. The average soil contents range from 182 μg kg(-1) in Flix to 23,488 μg kg(-1) in Almadén, while the average leaf content ranges from 161 μg kg(-1) in Jódar to 1213 μg kg(-1) in Almadén. Despite the wide range of data, a relationship between soil-leaf contents has been identified: in Almadén and Jódar, multiplicative (bilogarithmic) models show significant correlations (R = 0.769 and R = 0.484, respectively). Significant correlations were not identified between soil and leaf contents in Flix. The continuous activity of the Flix CAP, which remains open today, can explain the different uptake patterns for mercury, which is mainly atmospheric in origin, in comparison to the other two sites, where activity ceased more than 10 years ago and only soil uptake patterns based on the Michaelis-Menten enzymatic model curve are observed.

  8. Mobilization of Ag, heavy metals and Eu from the waste deposit of the Las Herrerias mine (Almería, SE Spain)

    Science.gov (United States)

    Navarro, A.; Cardellach, E.

    2009-02-01

    We studied the mobility of silver, heavy metals and europium in waste from the Las Herrerías mine in Almería (SE Spain). The most abundant primary mineral phases in the mine wastes are hematite, hydrohematite, barite, quartz, muscovite, anorthite, calcite and phillipsite. The minor phase consisted of primary minerals including ankerite, cinnabar, digenite, magnesite, stannite, siderite and jamesonite, and secondary minerals such as glauberite, szomolnokite, thenardite and uklonscovite. The soils show high concentrations of Ag (mean 21.6 mg kg-1), Ba (mean 2.5%), Fe (mean 114,000 mg kg-1), Sb (mean 342.5 mg kg-1), Pb (mean 1,229.8 mg kg-1), Zn (mean 493 mg kg-1), Mn (mean 4,321.1 mg kg-1), Cd (mean 1.2 mg kg-1) and Eu (mean 4.0 mg kg-1). The column experiments showed mobilization of Ag, Al, Ba, Cu, Cd, Eu, Fe, Mn, Ni, Sb, Pb and Zn, and the inverse modelling showed that the dissolution of hematite, hausmannite, pyrolusite and anglesite can largely account for the mobilization of Fe, Mn and Pb in the leaching experiment. The mobility of silver may be caused by the presence of kongsbergite and chlorargyrite in the waste, while the mobility of Eu seems to be determined by Eu(OH)3, which controls the solubility of Eu in the pH-Eh conditions of the experiments. The mineralogy, pH, Eh and geochemical composition of the mine wastes may explain the possible mobilization of heavy metals and metalloids. However, the absence of contaminants in the groundwater may be caused by the carbonate-rich environment of “host-rocks” that limits their mobility.

  9. Analytical investigation of Mudéjar polychrome on the carpentry in the Casa de Pilatos palace in Seville using non-destructive XRF and complementary techniques

    Science.gov (United States)

    Garrote, M. A.; Robador, M. D.; Perez-Rodriguez, J. L.

    2017-02-01

    The pigments, execution technique and repainting used on the polychrome wood ceilings and doors in the Casa de Pilatos (Seville, Spain) were studied using portable X-ray fluorescence equipment. Cross-sections of small samples were also analysed by optical microscopy, SEM with EDX analysis, micro-Raman and micro-infrared spectroscopy and X-ray diffraction. These carpentry works are magnificent examples of the Mudéjar art made in Spain in the early 16th century. Portable X-ray fluorescence gave good information on the different components of the polychrome. The SEM-EDX study of the surfaces of small samples gave information on their components and also characterized the compounds that had been deposited or formed by environmental contamination or by the alteration of some pigments. The SEM-EDX study of cross-sections facilitated the characterization of all layers and pigments from the support to the most external layer. The following pigments were characterized: red (cinnabar/vermillion, lead oxide, iron oxides and orpiment/realgar), black (carbon black), white (white lead and titanium barium white), yellow-orange-red-brown (orpiment/realgar and iron oxides), green (chromium oxide), blue (indigo blue and ultramarine blue), and gilding (gold leaf on bole). False gold, bronze and brass were also found. The pigments were applied with the oil painting technique over a support layer that had been primed with animal glue. This support layer was gypsum in some cases and white lead in others. This study is essential to the polychrome conservation of the studied artwork, and it will help clarify uncertainties in the history and painting of Mudéjar art.

  10. La metalurgia del mercurio en Almadén: desde los hornos de aludeles a los hornos Pacific

    Directory of Open Access Journals (Sweden)

    Tejero-Manzanares, José

    2014-12-01

    Full Text Available This paper shows the different types of furnaces for roasting cinnabar, used in the metallurgy of quicksilver over the centuries of exploitation of the Almadén Mines (Spain. Some of these techniques are part of our industrial heritage. They have contributed to name UNESCO World Heritage Site the vast technological legacy of these mines recently. This research contributes to close the long way of metallurgical activity from aludel furnaces until Pacif furnaces, first and lasted technology to produce on an industrial scale. It is delved into the most relevant aspects having to do with the type, evolution and number of furnaces existing on each of the periods.Este artículo profundiza en el conocimiento de los diferentes tipos de hornos de tostación de cinabrio, utilizados en la metalurgia del mercurio a lo largo de los siglos de explotación de las Minas de Almadén (España. Algunos de ellos forman parte de nuestro patrimonio histórico industrial y han contribuido a que todo el amplio legado tecnológico de estas minas haya sido nombrado recientemente Patrimonio de la Humanidad por la UNESCO. Este trabajo pretende abordar el largo bagaje de la actividad metalúrgica desde los hornos de aludeles hasta los hornos Pacific, primera y última de las tecnologías empleadas en producción a escala industrial. Se profundiza en aquellos aspectos más relevantes que tienen que ver con la tipología, evolución y número de hornos existentes en cada una de las épocas.

  11. Exploring the structural basis for selenium/mercury antagonism in Allium fistulosum

    Energy Technology Data Exchange (ETDEWEB)

    McNear, Jr., David H.; Afton, Scott E.; Caruso, Joseph A. (UCIN); (Kentucky)

    2012-12-10

    While continuing efforts are devoted to studying the mutually protective effect of mercury and selenium in mammals, few studies have investigated the mercury-selenium antagonism in plants. In this study, we report the metabolic fate of mercury and selenium in Allium fistulosum (green onion) after supplementation with sodium selenite and mercuric chloride. Analysis of homogenized root extracts via capillary reversed phase chromatography coupled with inductively coupled plasma mass spectrometry (capRPLC-ICP-MS) suggests the formation of a mercury-selenium containing compound. Micro-focused synchrotron X-ray fluorescence mapping of freshly excised roots show Hg sequestered on the root surface and outlining individual root cells, while Se is more evenly distributed throughout the root. There are also discrete Hg-only, Se-only regions and an overall strong correlation between Hg and Se throughout the root. Analysis of the X-ray absorption near edge structure (XANES) spectra show a 'background' of methylselenocysteine within the root with discrete spots of SeO{sub 3}{sup 2-}, Se{sup 0} and solid HgSe on the root surface. Mercury outlining individual root cells is possibly binding to sulfhydryl groups or plasma membrane or cell wall proteins, and in some places reacting with reduced selenium in the rhizosphere to form a mercury(II) selenide species. Together with the formation of the root-bound mercury(II) selenide species, we also report on the formation of cinnabar (HgS) and Hg{sup 0} in the rhizosphere. The results presented herein shed light on the intricate chemical and biological processes occurring within the rhizosphere that influence Hg and Se bioavailability and will be instrumental in predicting the fate and assisting in the remediation of these metals in the environment and informing whether or not fruit and vegetable food selection from aerial plant compartments or roots from plants grown in Hg contaminated soils, are safe for consumption.

  12. Assessment of mercury in the Savannah River Site environment

    Energy Technology Data Exchange (ETDEWEB)

    Kvartek, E.J.; Carlton, W.H.; Denham, M.; Eldridge, L.; Newman, M.C.

    1994-09-01

    Mercury has been valued by humans for several millennia. Its principal ore, cinnabar, was mined for its distinctive reddish-gold color and high density. Mercury and its salts were used as medicines and aphrodisiacs. At SRS, mercury originated from one of the following: as a processing aid in aluminum dissolution and chloride precipitation; as part of the tritium facilities` gas handling system; from experimental, laboratory, or process support facilities; and as a waste from site operations. Mercury is also found in Par Pond and some SRS streams as the result of discharges from a mercury-cell-type chlor-alkali plant near the city of Augusta, GA. Reactor cooling water, drawn from the Savannah River, transported mercury onto the SRS. Approximately 80,000 kg of mercury is contained in the high level waste tanks and 10,000 kg is located in the SWDF. Additional quantities are located in the various seepage basins. In 1992, 617 wells were monitored for mercury contamination, with 47 indicating contamination in excess of the 0.002-ppm EPA Primary Drinking Water Standard. More than 20 Savannah River Ecology Laboratory (SREL) reports and publications pertinent to mercury (Hg) have been generated during the last two decades. They are divided into three groupings: SRS-specific studies, basic studies of bioaccumulation, and basic studies of effect. Many studies have taken place at Par Pond and Upper Three Runs Creek. Mercury has been detected in wells monitoring the groundwater beneath SRS, but not in water supply wells in excess of the Primary Drinking Water Limit of 0.002 ppm. There has been no significant release of mercury from SRS to the Savannah River. While releases to air are likely, based on process knowledge, modeling of the releases indicates concentrations that are well below the SCDHEC ambient standard.

  13. Speciation and bioaccessibility of mercury in adobe bricks and dirt floors in Huancavelica, Peru.

    Science.gov (United States)

    Hagan, Nicole; Robins, Nicholas; Gonzales, Ruben Dario Espinoza; Hsu-Kim, Heileen

    2015-04-01

    Huancavelica, Peru, a historic cinnabar refining site, is one of the most mercury (Hg)-contaminated urban areas in the world. Exposure is amplified because residents build their adobe brick homes from contaminated soil. The objectives of this study were to compare two Hg-leaching procedures, and their application as risk-assessment screening tools in Hg-contaminated adobe brick homes in Huancavelica. The purpose was to evaluate potential health implications, particularly for children, after ingestion of Hg-contaminated particles. Hg was measured in adobe brick and dirt floor samples from 60 households by total Hg extraction, simulated gastric fluid (GF) extraction, and sequential selective extraction (SSE), which provides more detailed data but is resource-intensive. Most of the Hg present in samples was relatively insoluble, although in some households soluble Hg species were present at concentrations that may be of concern after ingestion. A strong correlation was identified between results from simulated GF extraction of adobe bricks and dirt floors and the more soluble fractions of Hg from SSE. Simulated GF extraction data were combined with ingestion and body mass characteristics for small children to compare potential risk of ingestion of Hg-contaminated soil with current health standards. Simulated GF extraction can be used as a risk assessment screening tool for effective allocation of time and resources to households that have measurable concentrations of bioaccessible Hg. Combining simulated GF extraction data with health standards enables intervention strategies targeted at households with the greatest potential health threat from ingestion of Hg-contaminated particles.

  14. Testing the generalist-specialist dilemma: the role of pyrrolizidine alkaloids in resistance to invertebrate herbivores in Jacobaea species.

    Science.gov (United States)

    Wei, Xianqin; Vrieling, Klaas; Mulder, Patrick P J; Klinkhamer, Peter G L

    2015-02-01

    Plants produce a diversity of secondary metabolites (SMs) to protect them from generalist herbivores. On the other hand, specialist herbivores use SMs for host plant recognition, feeding and oviposition cues, and even sequester SMs for their own defense. Therefore, plants are assumed to face an evolutionary dilemma stemming from the contrasting effects of generalist and specialist herbivores on SMs. To test this hypothesis, bioassays were performed with F2 hybrids from Jacobaea species segregating for their pyrrolizidine alkaloids (PAs), using a specialist flea beetle (Longitarsus jacobaeae) and a generalist slug (Deroceras invadens). Our study demonstrated that while slug feeding damage was negatively correlated with the concentration of total PAs and that of senecionine-like PAs, flea beetle feeding damage was not affected by PAs. It was positively correlated though, with leaf fresh weight. The generalist slug was deterred by senecionine-like PAs but the specialist flea beetle was adapted to PAs in its host plant. Testing other herbivores in the same plant system, it was observed that the egg number of the specialist cinnabar moth was positively correlated with jacobine-like PAs, while the silver damage of generalist thrips was negatively correlated with senecionine- and jacobine-like PAs, and the pupae number of generalist leaf miner was negatively correlated with otosenine-like PAs. Therefore, while the specialist herbivores showed no correlation whatsoever with PA concentration, the generalist herbivores all showed a negative correlation with at least one type of PA. We concluded that the generalist herbivores were deterred by different structural groups of PAs while the specialist herbivores were attracted or adapted to PAs in its host plants.

  15. Mercury concentrations in fish-eating birds from the Pinchi Lake area in relation to productivity and reproductive success

    Energy Technology Data Exchange (ETDEWEB)

    Weech, S.A. [Minnow Environmental Inc., Victoria, BC (Canada); Scheuhammer, T.M. [Environment Canada, Ottawa, ON (Canada)]|[Carleton Univ., Ottawa, ON (Canada). National Wildlife Research Centre

    2006-07-01

    A known bird breeding area along the Pinchi fault in central British Columbia is a source of geologic mercury (Hg) in the form of cinnabar. Lakes with a range of sediment Hg concentrations are also present. This study examined the extent to which inorganic Hg from local geologic sources is methylated and incorporated into the food chain of birds feeding on fishes. The possible toxic effects of natural and mining-related Hg releases on local piscivorous breeding bird populations were also studied. Bald eagles and red-necked grebes were monitored from 2000 to 2002 in an effort to determine if increased Hg concentrations were affecting reproductive success and productivity. Fish tissues were collected from rainbow trout and northern pike minnow to determine if Hg levels were elevated. Eagles breeding on 5 lakes were sampled for blood- and feather-Hg concentrations. Red-necked grebe eggs were also collected. All samples were analyzed for total Hg. It was shown that Hg does not appear to have any obvious adverse effects on reproduction. Concentrations of Hg in all grebe eggs were below 0.5 {mu}g.g wet weight, the lowest observed adverse effect level (LOAEL) for Hg developmental toxicity in birds. Although the level of Hg in tissues of Pinchi Lake birds was elevated, the birds were in excellent condition and showed similar reproductive success and productivity to reference populations. This study showed that concurrent tissue sampling and population monitoring can provide a helpful way to prove or refute findings that may indicate a potential contaminant effect on local wildlife. 27 refs., 1 tab., 4 figs.

  16. Zinc-germanium ores of the Tres Marias Mine, Chihuahua, Mexico

    Science.gov (United States)

    Saini-Eidukat, Bernhardt; Melcher, Frank; Lodziak, Jerzy

    2009-04-01

    The Tres Marias carbonate-hosted Zn-Ge deposit in Chihuahua, Mexico contains sphalerite with the highest average Ge (960 ppm) and willemite with the highest reported Ge contents of Mississippi-Valley-type (MVT) deposits worldwide. This has prompted current exploration efforts to focus on the deposit as a high-grade source of germanium. The sulfide-rich ore type (>125,000 t at 20% Zn and 250 g/t Ge) contains Fe-rich botryoidal sphalerite (type I) associated with solid hydrocarbons. This type exhibits distinctive intimately intergrown lamellar texture of high-Fe sphalerite (average 9.9 wt.% Fe and 800 ppm Ge) and a somewhat less Fe-rich sphalerite phase (average 5.5 wt.% Fe and 470 ppm Ge). Reddish-brown banded sphalerite (type II, average 5.7 wt.% Fe and 1,320 ppm Ge) is subordinately followed by galena and pyrite. The sulfide-poor “oxidized” zinc ore (up to 50 wt.% Zn; 250 to 300 ppm Ge) is a fine-grained, often friable, alteration product of the sulfide ore and associated limestone and breccia host. While some areas are dominated by carbonates and sulfates, others are enriched in silicates such as hemimorphite and willemite. The gangue assemblage includes goethite, hematite, and amorphous silica or quartz. Minor wulfenite, greenockite, cinnabar, and descloizite also occur. Willemite occurs as interstitial replacement of sphalerite and fracture fillings in the oxidized ore and can be unusually rich in Pb (up to 2.0 wt.%) and Ge (up to 4,000 ppm). Oscillatory zonation reflects trace element incorporation into willemite from the oxidation of primary Ge-bearing sphalerite and galena by siliceous aqueous fluids. The Tres Marias deposit has hybrid characteristics consisting of a primary low-temperature MVT Ge-rich Zn-Pb sulfide ore body, overprinted by Ge-rich hemimorphite, willemite, and Fe oxide mineralization.

  17. Exploring the structural basis for selenium/mercury antagonism in Allium fistulosum.

    Science.gov (United States)

    McNear, David H; Afton, Scott E; Caruso, Joseph A

    2012-03-01

    While continuing efforts are devoted to studying the mutually protective effect of mercury and selenium in mammals, few studies have investigated the mercury-selenium antagonism in plants. In this study, we report the metabolic fate of mercury and selenium in Allium fistulosum (green onion) after supplementation with sodium selenite and mercuric chloride. Analysis of homogenized root extracts via capillary reversed phase chromatography coupled with inductively coupled plasma mass spectrometry (capRPLC-ICP-MS) suggests the formation of a mercury-selenium containing compound. Micro-focused synchrotron X-ray fluorescence mapping of freshly excised roots show Hg sequestered on the root surface and outlining individual root cells, while Se is more evenly distributed throughout the root. There are also discrete Hg-only, Se-only regions and an overall strong correlation between Hg and Se throughout the root. Analysis of the X-ray absorption near edge structure (XANES) spectra show a "background" of methylselenocysteine within the root with discrete spots of SeO(3)(2-), Se(0) and solid HgSe on the root surface. Mercury outlining individual root cells is possibly binding to sulfhydryl groups or plasma membrane or cell wall proteins, and in some places reacting with reduced selenium in the rhizosphere to form a mercury(ii) selenide species. Together with the formation of the root-bound mercury(ii) selenide species, we also report on the formation of cinnabar (HgS) and Hg(0) in the rhizosphere. The results presented herein shed light on the intricate chemical and biological processes occurring within the rhizosphere that influence Hg and Se bioavailability and will be instrumental in predicting the fate and assisting in the remediation of these metals in the environment and informing whether or not fruit and vegetable food selection from aerial plant compartments or roots from plants grown in Hg contaminated soils, are safe for consumption.

  18. Microprobe techniques for speciation analysis and geochemical characterization of mine environments: the mercury district of Almadén in Spain.

    Science.gov (United States)

    Bernaus, Anna; Gaona, Xavier; Esbrí, José Maria; Higueras, Pablo; Falkenberg, Gerald; Valiente, Manuel

    2006-07-01

    Metallurgic calcines with very high mercury and methylmercury content from the Almadén mining district were analyzed by synchrotron-based microprobe techniques. Information about mercury speciation was obtained by micro-EXAFS (microscopic extended X-ray absorption fine structure) spectroscopy, whereas elemental associations were evaluated by micro-XRF (microscopic X-ray fluorescence analysis) mapping. Complementary characterization methodologies, including X-ray diffraction (XRD), inductively coupled plasma-optical spectroscopy (ICP-OES), as well as a sequential extraction scheme (SES), were used to predict the potential availability of mercury. Analysis of total metal content revealed extremely high concentrations of mercury and iron (between 7 and 35 and 65-70 g kg(-1), respectively) and high zinc concentrations (2.2-2.5 g kg(-1)), whereas other metals such as copper, nickel, and lead were found at low concentration levels (30-300 mg kg(-1)). Micro-EXAFS results indicate that cinnabar (HgS(red)) is one of the main species within the studied mercury-rich particles (5-89% of total mercury content), together with more soluble mercury compounds such as Hg3(SO4)02 (schuetteite) and HgO (5-55% of total mercury content). Additionally, element-specific micro-XRF maps of selected mercury-rich particles in the studied samples revealed an evident correlation among Hg-Pb-Ni (and S), indicating a possible geochemical linkage of these elements. Correlations were also found among Fe-Mn and Hg, which have been attributed to sorption of mercury onto oxyhydroxides of Fe and Mn. This finding was supported by results from a sequential extraction scheme, where a significant

  19. The Byzantine Church of ``40 Holy Martyrs'' in Veliko Turnovo, Bulgaria: Pigments and Technique

    Science.gov (United States)

    Sakellariou, E.; Zorba, T.; Pavlidou, E.; Angelova, S.; Paraskevopoulos, K. M.

    2010-01-01

    The "St. 40 Martyrs" church is the most famous medieval building in Veliko Turnovo, Bulgaria. It is located in Assenova mahala, just next to Tsarevets. It was built and its walls were painted during the reign of Bulgarian king Ivan Assen II after the victory against Epyrus despot Theodoros Comninos (1230 AD). It consists of two buildings - a six-column basilica and another, smaller building on its western wall, which was built later. During the presence of the Ottoman Turks, maybe until the first half of the 18th century, the church remained christian. When it was converted to a mosque, all the christian symbols in it were destroyed. The archeological researches on site were initiated in 1969. As it is clear, the 40 Martyrs church is a historical monument of culture with great significance. The church had murals, from the earlier period, but in the following years and especially during the Ottoman period, the church has suffered many and different destructions. Nevertheless, the very few pieces of murals that are rescued till nowadays provide important information for the technique and the pigments that were used on its wall paintings. In the present work, twelve series of samples from the wall paintings were studied in order to characterize the materials and the technique used for church iconography. The study was based on the micro-analytical techniques of the Fourier Transform Infrared micro-spectroscopy (μs-FTIR), the Optical Microscopy and the Scanning Electron Microscopy (SEM) coupled to an Energy Dispersive X-ray Spectrometer (EDS). In the FTIR spectra of all pigments the characteristic peaks of calcite were detected, confirming the use of fresco technique for the creation of murals. The combination of FTIR spectroscopy and SEM-EDS analysis, reveal the existence of lapis-lazuli for the blue color, green earth for the green color, cinnabar for the red color, calcite for the white color and carbon black for the black color. Moreover, in other chromatic layers

  20. Potential anthropogenic mobilisation of mercury and arsenic from soils on mineralised rocks, Northland, New Zealand.

    Science.gov (United States)

    Craw, D

    2005-02-01

    Eroded roots of hot spring systems in Northland, New Zealand consist of mineralised rocks containing sulfide minerals. Marcasite and cinnabar are the dominant sulfides with subordinate pyrite. Deep weathering and leached soil formation has occurred in a warm temperate to subtropical climate with up to 3 m/year rainfall. Decomposition of the iron sulfides in natural and anthropogenic rock exposures yields acid rock drainage with pH typically between 2 and 4, and locally down to pH 1. Soils and weathered rocks developed on basement greywacke have negligible acid neutralisation capacity. Natural rainforest soils have pH between 4 and 5 on unmineralised greywacke, and pH is as low as 3.5 in soils on mineralised rocks. Roads with aggregate made from mineralised rocks have pH near 3, and quarries from which the rock was extracted can have pH down to 1. Mineralised rocks are enriched in arsenic and mercury, both of which are environmentally available as solid solution impurities in iron sulfides and phosphate minerals. Base metals (Cu, Pb, Zn) are present at low levels in soils, at or below typical basement rock background. Decomposition of the iron sulfides releases the solid solution arsenic and mercury into the acid rock drainage solutions. Phosphate minerals release their impurities only under strongly acid conditions (pHacid rock drainage areas have arsenic and mercury below drinking water limits. Leaching experiments and theoretical predictions indicate that both arsenic and mercury are least mobile in acid soils, at pH of c. 3-4. This optimum pH range for fixation of arsenic and mercury on iron oxyhydroxides in soils is similar to natural pH at the field site of this study. However, neutralisation of acid soils developed on mineralised rocks is likely to decrease adsorption and enhance mobility of arsenic and mercury. Hence, development of farmland by clearing forest and adding agricultural lime may mobilise arsenic and mercury from underlying soils on mineralised

  1. Hanawaltite, Hg1+6Hg2+[Cl,(OH)]2O3 - A new mineral from the Clear Creek claim, San Benito County, California: Description and crystal structure

    Science.gov (United States)

    Roberts, Andrew C.; Grice, Joel D.; Gault, Robert A.; Criddle, A.J.; Erd, Richard C.

    1996-01-01

    Hanawaltite, ideally Hg1+6Hg2+O3Cl2, is orthorhombic, Pbma (57), with unit-cell parameters refined from powder data: a=11.790(3), b=13.881(4), c=6.450(2) A??, V=1055.7(6) A??3, a:b:c =0.8494:1:0.4647, Z=4. The strongest six lines of the X-ray powder-diffraction pattern [d in A?? (I)(hkl)] are: 5.25 (80)(111), 3.164 (60)(231), 3.053 (100)(041), 2.954 (70)(141), 2.681 (50)(401), and 2.411 (50)(232,341). The mineral is an extremely rare constituent in a small prospect pit near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, California. It was found on a single-fracture surface where it is intimately associated with calomel, native mercury, cinnabar, montroydite, and quartz. Individual crystals are subhedral to anhedral, platy to somewhat bladed, and average about 50 ??m in longest dimension. The largest known crystal is approximately 0.3??0.3 mm in size and is striated parallel [001]. Hanawaltite is opaque to translucent (on very thin edges), black to very dark brown-black in color, with a black to dark red-brown streak. Other physical properties include: metallic luster; cleavage {001} good; uneven fracture; brittle; nonfluorescent; Hcrystal structure was determined, the original microprobe value for Hg2O, 96.2, was partitioned in a ratio of 6Hg2O:HgO and (OH) was calculated, such that Cl+(OH)=2. The hanawaltite structure consists of undulatory [Hg-Hg]2+ ribbons which roughly parallel (100). The diatomic [Hg-Hg]2+ groups have anion tails which, in turn, serve as cross linkages between dimer ribbons through [Hg2+O2Cl2] planar rhombs. The structure is compared to that of other mercury oxychlorides and each is found to have its own unique structural features. This structural diversity is attributed to the inherent ability of mercury to adopt either metallic or ionic types of bonds. The mineral name honors the late Dr. J. D. (Don) Hanawalt (1903-1987), who was a pioneer in the field of X-ray powder diffraction. ?? 1996 International

  2. Macroscopic and microscopic observations of particle-facilitated mercury transport from New Idria and Sulphur Bank mercury mine tailings

    Science.gov (United States)

    Lowry, G.V.; Shaw, S.; Kim, C.S.; Rytuba, J.J.; Brown, Gordon E.

    2004-01-01

    Mercury (Hg) release from inoperative Hg mines in the California Coast Range has been documented, but little is known about the release and transport mechanisms. In this study, tailings from Hg mines located in different geologic settings-New Idria (NI), a Si-carbonate Hg deposit, and Sulphur Bank (SB), a hot-spring Hg deposit-were characterized, and particle release from these wastes was studied in column experiments to (1) investigate the mechanisms of Hg release from NI and SB mine wastes, (2) determine the speciation of particle-bound Hg released from the mine wastes, and (3) determine the effect of calcinations on Hg release processes. The physical and chemical properties of tailings and the colloids released from them were determined using chemical analyses, selective chemical extractions, XRD, SEM, TEM, and X-ray absorption spectroscopy techniques. The total Hg concentration in tailings increased with decreasing particle size in NI and SB calcines (roasted ore), but reached a maximum at an intermediate particle size in the SB waste rock (unroasted ore). Hg in the tailings exists predominantly as low-solubility HgS (cinnabar and metacinnabar), with NI calcines having >50% HgS, SB calcines having >89% HgS, and SB waste rock having ???100% HgS. Leaching experiments with a high-ionic-strength solution (0.1 M NaCl) resulted in a rapid but brief release of soluble and particulate Hg. Lowering the ionic strength of the leach solution (0.005 M NaCl) resulted in the release of colloidal Hg from two of the three mine wastes studied (NI calcines and SB waste rock). Colloid-associated Hg accounts for as much as 95% of the Hg released during episodic particle release. Colloids generated from the NI calcines are produced by a breakup and release mechanism and consist of hematite, jarosite/alunite, and Al-Si gel with particle sizes of 10-200 nm. ATEM and XAFS analyses indicate that the majority (???78%) of the mercury is present in the form of HgS. SB calcines also

  3. Vulnerability of soils towards mining operations in gold-bearing sands in Chile

    Science.gov (United States)

    Jordán, Manuel Miguel; González, Irma; Bech, Jaume; Sanfeliu, Teófilo; Pardo, Francisco

    2015-04-01

    , lead, cadmium, crome, zinc, cobalt, cooper, platinum, gold, indium, tellurium, etc., and as well some traces of cerium, praseodymium, gadolinium, neodymium, samarium and lanthanum. The recurring presence of Pb, sulphur and Hg, among others, in mineral species like galena and cinnabar reveal accumulation indices, a product of the contaminating action of human beings. This is notable since no records exist of natural deposits of these minerals that can justify their presence, and records were utilized from semi-industrial exploitations for the extaction of gold where Hg is utilized in the amalgamation processes.

  4. Online analysis of europium and gadolinium species complexed or uncomplexed with humic acid by capillary electrophoresis-inductively coupled plasma mass spectrometry.

    Science.gov (United States)

    Kautenburger, Ralf; Nowotka, Karsten; Beck, Horst Philipp

    2006-03-01

    Detailed information on the geochemical behavior of radioactive and toxic metal ions under environmental conditions (in geological matrices and aquifer systems) is needed in order to assess the long-term safety of waste repositories. This includes knowledge of the mechanisms of relevant geochemical reactions, as well as associated thermodynamic and kinetic data. Several previous studies have shown that humic acid can play an important role in the immobilization or mobilization of metal ions due to complexation and colloid formation. In our project we investigate the complexation behavior of (purified Aldrich) humic acid and its influence on the migration of the lanthanides europium and gadolinium (homologs of the actinides americium and curium) in the ternary system consisting of these heavy metals, humic acid and kaolinite (KGa-1b) under almost natural conditions. Capillary electrophoresis (CE, Beckman Coulter P/ACE MDQ), with its excellent separation performance, was hyphenated with a homemade interface to inductively coupled plasma mass spectrometry (ICP-MS, VG Elemental PlasmaQuad 3) giving a system that is highly sensitive to the rare-earth element species of europium and gadolinium with humic acid. The humic acid used was also halogenated with iodine, which acted as an ICP-MS marker. To couple CE to ICP-MS, a fused silica CE capillary was flexibly fitted into a MicroMist 50 mul nebulizer with a Cinnabar cyclonic spray chamber in the external homemade interface. The chamber was chilled to a temperature of 4 degrees C to optimize the sensitivity. 200 ppb of cesium were added to the CE separation buffer so that the capillary flow could be observed. A make-up fluid including 4 ppb Ho as an internal standard was combined with the flow from the capillary within the interface in order to get a fluid throughput high enough to maintain continuous nebulization. Very low detection limits were achieved: 125 ppt for 153Eu and 250 ppt for 158Gd. Using this optimized CE

  5. Identifying the Pigmentsof a Ming-dynasty Water-and-Land Painting%一幅明代水陆画颜料的分析鉴别

    Institute of Scientific and Technical Information of China (English)

    王欢欢; 程爱民; 马清林; 王治涛; 王昌燧

    2014-01-01

    水陆画是水陆法会供奉的绘画,它在我国绘画史上占有特殊的位置。本研究利用体视显微镜、偏光显微镜、X 射线荧光光谱和拉曼光谱等技术,首次对明代绢本水陆画颜料的形貌、成分进行了观察和测试,并分析了它的保存状况。研究表明,其红色颜料为混有少量铅丹的朱砂;蓝色颜料由蓝铜矿、赭石和白云母混合而成;浅蓝色颜料为靛蓝;绿色颜料的主体成分为氯铜矿,间有少量孔雀石和蓝铜矿;白色颜料则为水白铅矿及微量石膏。观察显示,部分颜料有开裂和剥落的现象。不难认识到,此项工作可为水陆画的颜料使用、保护修复和艺术史研究提供有价值的信息。%Water-and-land-paintings were used as water-and-land religious assembly consecration paint-ings, which enjoy a special position in the history of Chinese paintings. Astereomicroscope, a polarizing micro-scope, X- ray fluorescence spectrometry, and Raman spectra were applied in this research to analyze the physi-cal appearance, conservation conditions, and sample components from a water-and-land painting taken from Gulang Museum.The results indicate that the red pigments are mainly cinnabar with some red lead; the blue is a mixture of azurite, hematite, and muscovite; the light blue is indigo; the greens are mainly atacamite and mala-chite with a little azurite; and the white pigments are hydrocerussite and tiny gypsum. Further observation shows that some pigments are cracking and spalling. This research can provide information valuable for effective art protection and restoration, and for art history research.

  6. Hypogenic speleogenesis in quartzite: The case of Corona 'e Sa Craba Cave (SW Sardinia, Italy)

    Science.gov (United States)

    Sauro, Francesco; De Waele, Jo; Onac, Bogdan P.; Galli, Ermanno; Dublyansky, Yuri; Baldoni, Eleonora; Sanna, Laura

    2014-04-01

    The paper presents a detailed study demonstrating the hypogenic origin of the Corona 'e Sa Craba quartzite cave in SW Sardinia (Italy). Although the quartzite host-rock of this cave derived from silicification of Cambrian dolostones and dissolution of carbonate remnants could have had a role in the speleogenesis, detailed morphologic and petrographic investigation revealed clear evidence of quartz dissolution without signs of mechanical erosion by running waters. Thin section microscopy and scanning electron microscope (SEM) images show pervasive dissolution morphologies, such as pits and notches on quartz crystals causing the deep arenization of the cave walls, suggesting that the dissolution of quartz had a primary role in the formation of the void. The study of secondary cave minerals and the sulfur isotopic composition of sulfates and sulfides, coupled with data on fluid inclusions, allowed reconstruction of the peculiar speleogenetic history of this hypogenic hydrothermal quartzite cave. The cave formed by reduced hydrothermal fluids, probably under basic-neutral pH in phreatic conditions. The presence of abundant cations of Ba2 + in reduced Cl-rich fluids enhanced the quartz dissolution rate, allowing the formation of the voids in deep settings. During the Late Oligocene uplift of the area, the hydrothermal fluids in the cave reached oxygen-rich conditions, thus a minerogenetic phase started with the deposition of barite when the temperature of the fluid was ≤ 50 °C. The presence of cinnabar crusts in the lower part of the cave walls and on the boulders suggests a later volcanic phase with Hg-rich vapors ascending from below. Other minerals such as alunite, basaluminite, gypsum and halloysite (typical of an acid sulfate alteration environment), and phosphates were formed in a final, much more recent stage. The δ34S values of the cave sulfate minerals indicate that S is derived from the remobilization of original Precambrian Pb-Zn Mississippi Valley Type

  7. ZnTe结构相变、电子结构和光学性质的研究∗%Structural phase transition, electronic structures and optical prop erties of ZnTe

    Institute of Scientific and Technical Information of China (English)

    胡永金; 吴云沛; 刘国营; 罗时军; 何开华

    2015-01-01

    The equations of state and phase transition of ZnTe in zinc blende (ZB) and cinnabar (CB) structures under high pressure are investigated by the projected augmented wave method in the scheme of density functional theory. The primitive cell volumes, electronic structures and optical properties are also predicted before and after phase transition. The variations of the calculated total energy with volume, for the structures of ZB and CB, yield the information about the static equation of state and phase stability. The results show that the ZB phase of ZnTe has lower energy, and is more stable than its CB phase. The pressure-induced transition occurs along the common tangent line connecting the tangential points on the two enthalpy-volume curves. The calculations show that the phase transition pressure is 8.6 GPa from the ZB structure to the CB structure. The value is also compatible with those of other available theoretical and experimental results. Just before the ZB phase is transferred to the CB phase at about 8.6 GPa, the volume is reduced by 13.0%relative to the former volume at the ambient pressure condition. The calculated critical volumes and volume compressibilities by using two methods agree well with other results in the literature. The lattice parameters and equations of state of the two structures are also obtained. Metallization case of other similar materials such as ZnS caused by high pressure does not occur here. The CB phase has the behavior of indirect band gap with 0.98 eV along the symmetry of G → K . After phase transition, the distributions of density of states of Zn and Te atoms of the CB structure shift towards lower energy, especially in the conduction band bottom, and the band gap decreases. Energy level overlapping is more obvious in the CB structure, and orbital hybridizations still exist, that is the reason why it is the stable phase under high pressure condition. Stronger orbital hybridization helps the transitions between Te 5p and

  8. Non-isothermal kinetics of the thermal desorption of mercury from a contaminated soil

    Directory of Open Access Journals (Sweden)

    López, Félix A.

    2014-03-01

    Full Text Available The Almadén mining district (Ciudad Real, Spain was the largest cinnabar (mercury sulphide mine in the world. Its soils have high levels of mercury a consequence of its natural lithology, but often made much worse by its mining history. The present work examines the thermal desorption of two contaminated soils from the Almadén area under non-isothermal conditions in a N2 atmosphere, using differential scanning calorimetry (DSC. DSC was performed at different heating rates between room temperature and 600 °C. Desorption temperatures for different mercury species were determined. The Friedman, Flynn-Wall-Ozawa and Coasts–Redfern methods were employed to determine the reaction kinetics from the DSC data. The activation energy and pre-exponential factor for mercury desorption were calculated.El distrito minero de Almadén (Ciudad Real, España tiene la mayor mina de cinabrio (sulfuro de mercurio del mundo. Sus suelos tienen altos niveles de mercurio como consecuencia de su litología natural, pero a menudo su contenido en mercurio es mucho más alto debido a la historia minera de la zona. Este trabajo examina la desorción térmica de dos suelos contaminados procedentes de Almadén bajo condiciones isotérmicas en atmósfera de N2, empleando calorimetría diferencial de barrido (DSC. La calorimetría se llevó a cabo a diferentes velocidades de calentamiento desde temperatura ambiente hasta 600 °C. Se determinaron las diferentes temperaturas de desorción de las especies de mercurio presentes en los suelos. Para determinar la cinética de reacción a partir de los datos de DSC se utilizaron los métodos de Friedman, Flynn-Wall-Ozawa y Coasts–Redfern. Además se calcularon las energías de activación y los factores pre-exponenciales para la desorción del mercurio.

  9. The bacterial diversity in the Mogao Grottoes, Dunhuang, China%敦煌莫高窟中细菌多样性的研究

    Institute of Scientific and Technical Information of China (English)

    张昺林; 唐德平; 张楠; 王婉如; 张东明; 武发思; 薛林贵

    2012-01-01

    [目的]通过对敦煌莫高窟内细菌多样性及生理生化特征的分析,为壁画微生物病害防治提供试验依据.[方法]采用纯培养与16S rDNA等技术对莫高窟245#窟内空气样品、壁画样品进行分析,并在培养基中添加壁画颜料测试其对细菌生长的影响.[结果]分离出可培养细菌76株,分属于8个属.其中空气中有6个属,分别为Bacillus、Arthrobacter、Pseudomonas、Acinetobacter、Enterobacter、Kocuria,优势菌为Bacillus、Arthrobacter.壁画上有Bacillus、Arthrobacter、Paenibacillus、Erythrobacter 4个属,优势菌为Bacillus、Arthrobacter;并发现DHXJ05 (Enterobacteriaceae)、DHXJ08 (Bacillaceae)、DHXJ15 (Erythrobacteraceae)、DHXJ16 (Bacillaceae)和DHXJ17 (Bacillaceae)能在含有铁红、铅丹、朱砂的环境中良好生长.[结论]为后期研究壁画颜料的变色机理及选择相应的细菌防治制剂提供了条件.%[Objective] Analyzing the bacterial diversity, physiological and biochemical characteristics in the mogao grottoes can provide an experimental basis for microbial disease prevention and treatment of Mogao murals. [Methods] Both the air and mural samples collected from Mogao Grottoes 245# are analyzed by means of pure culture techniques, and testing effect of mural paint on bacterial growth. [Results] 76 bacteria belonging to eight different genera are identified and characterized. Six genera are revived form the air, they are Bacillus, Ar-throbacter, Pseudomonas, Acinetobacter, Enterobacter, Kocuria, Among them, Bacillus and Arthrobacter are dominant. Four genera are revived from the mural, they are Bacillus, Ar-throbacter, Paenibacillus, Erythrobacter, among them, Bacillus and Arthrobacter are dominant; and it is found that some bacteria, such as DHXJ05 (Enterobacteriaceae), DHXJ08 (Bacillaceae), DHXJ15 (Erythrobacteraceae), DHXJ16 (Bacillaceae) and DHXJ17 (Bacilla-ceae) can grow well in environment containing red ferric oxide, red lead, and cinnabar

  10. Speciation methods and sample analysis of soluble mercury in traditional Chinese medicines%中成药可溶性汞形态分析方法及样品结果测定

    Institute of Scientific and Technical Information of China (English)

    徐陆正; 解清; 闫赖赖; 陈玉红; 王京宇

    2011-01-01

    建立了微波辅助提取、HPLC-ICP-MS联用分析中成药中二价汞和甲基汞的方法.分别比较了提取液中盐酸和L-半胱氨酸含量、提取温度和提取时间对提取结果的影响,得到了微波辅助提取的最优条件:体积分数为1%的盐酸10 mL和质量分数为5%的L-半胱氨酸1 mL作为提取液,控温70℃,微波辅助提取1h.该方法测得的二价汞和甲基汞的精密度分别为1.7%和4.4%,加标回收率分别为80.7%~99.5%和93.7%~95.8%.并应用该方法分析测定了20种、共49批次的含朱砂的中成药中可溶性汞的形态.%A method with microwave-assisted extraction and HPLC-ICP-MS to analyse the inorganic mercury and methyl mercury in the traditional Chinese medicines (TCMs) has been built. The hydrochloric acid and L-cysteine concentration, the extraction temperature and extraction time have been investigated. The optimal conditions are as follows: 1% hydrochloric acid 10 ml and 5% L-cysteine 1 ml as extract, temperature control 70 ℃, and time control lh. Using this method, the inorganic mercury and methyl mercury's RSDs(relative standard deviation) are 1. 7% and 4. 4%, and the standardized recoveries are 80. 7~99. 5% and 93. 7~ 95. 8%. Then, 49 batches of 20 kinds TCMs which contain cinnabar have been determinated using this method.

  11. Benthic biogeochemical cycling of mercury in two contaminated northern Adriatic coastal lagoons

    Science.gov (United States)

    Covelli, Stefano; Emili, Andrea; Acquavita, Alessandro; Koron, Neža; Faganeli, Jadran

    2011-10-01

    Previous research recognized most of the Northern Adriatic coastal lagoon environments as contaminated by mercury (Hg) from multiple anthropogenic sources. Among them, the Pialassa Baiona (P.B.) Lagoon, located near the city of Ravenna (Italy), received between 100 and 200 tons of Hg, generated by an acetaldehyde factory in the period 1957-1977. Further east, the Grado Lagoon has been mainly affected by a long-term Hg input from the Idrija mine (western Slovenia) through the Isonzo River since the 16th century. Hg cycling at the sediment-water interface (SWI) of the two lagoons was investigated and compared by means of an in situ benthic chamber, estimating diffusive Hg and Methyl-Hg fluxes in the summer season. Major chemical features in porewaters (Fe, Mn, H 2S, dissolved inorganic (DIC) and organic carbon (DOC), nutrients) and in the solid phase (C org, N and S) were also explored to understand the general biogeochemical conditions of the system in response to benthic respiration. The daily integrated flux for the methylated Hg form was extremely low in P.B. Lagoon, accounting for only 7% of the corresponding flux calculated for the Grado Lagoon. Despite a higher sedimentary Hg content in the P.B. Lagoon (14.4-79.0 μg g -1) compared to the Grado Lagoon (10.7-12.5 μg g -1), the in situ fluxes of Hg in the two experimental sites appeared similar. A selective sequential extraction procedure was applied to the solid phase, showing that the stable crystalline mineral phase cinnabar (HgS) is the predominant Hg fraction (about 50%) in the Grado Lagoon surface sediments. Conversely, Hg mobilization and sequestration in the P.B. Lagoon is related to the extremely anoxic redox conditions of the system where the intense sulfate reduction, by the release of sulfur and the formation of sulfides, limits the metal recycling at the SWI and its availability for methylation processes. Thus, the environmental conditions at the SWI in the P.B. Lagoon seem to represent a natural

  12. Mercury species in formerly contaminated soils and released soil gases.

    Science.gov (United States)

    Sysalová, Jiřina; Kučera, Jan; Drtinová, Barbora; Červenka, Rostislav; Zvěřina, Ondřej; Komárek, Josef; Kameník, Jan

    2017-02-01

    Total mercury (T-Hg), elemental mercury (Hg(0)), methylmercury (MeHg(+)), phenylmercury (PhHg(+)), and gaseous elemental mercury (GEM) species were determined in soils formerly contaminated by different processes from two sites in the Czech Republic. Analytical methods involved atomic absorption spectrometry (AAS) using a single-purpose Advanced Mercury Analyser AMA-254 and radiochemical neutron activation analysis (RNAA) for T-Hg determination, a thermal desorption method was used for Hg(0) determination, gas chromatography coupled with atomic fluorescence spectrometry (GC-AFS) was employed for assay of MeHg(+) and PhHg(+), while GEM measurement was carried out using a portable Zeeman-AAS device Lumex RA-915(+). The first sampling site was in the surroundings of a former PhHgCl-based fungicide processing plant next to Příbram (central Bohemia). Although the use of Hg-based fungicides as seed mordant have been banned, and their production stopped at the end of 1980's, highly elevated Hg contents in soil are still observed in the vicinity of the former plant, reaching T-Hg values >13mgkg(-1). The second sampling site was an abandoned mining area named Jedová hora Hill near Hořovice (central Bohemia), where cinnabar (HgS) was occasionally mined as by-product of Fe ores hematite and siderite. Mining activities have been stopped here in 1857. Very high contents of T-Hg are still found at this site, up to 144mgkg(-1). In most cases we found a statistically significant correlation between T-Hg and Hg(0) values regardless of the pollution source. On the contrary, insignificant correlation was observed neither between T-Hg and GEM values, nor between GEM and Hg(0). Concentrations of the investigated organomercury species were above a limit of detection (LOD) only in the most contaminated samples, where their levels were about two to three orders of magnitude lower compared to those of T-Hg.

  13. Final Technical Report: Mercury Release from Organic Matter (OM) and OM-Coated Mineral Surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Nagy, Kathryn L. [Univ. of Illinois, Chicago, IL (United States)

    2015-08-18

    Chemical reactions between mercury, a neurotoxin, and sulfur, an essential nutrient, in the environment control to a large extent the distribution and amount of mercury available for uptake by living organisms. The largest reservoir of sulfur in soils is in living, decaying, and dissolved natural organic matter. The decaying and dissolved organic matter can also coat the surfaces of minerals in the soil. Mercury (as a divalent cation) can bind to the sulfur species in the organic matter as well as to the bare mineral surfaces, but the extent of binding and release of this mercury is not well understood. The goals of the research were to investigate fundamental relationships among mercury, natural organic matter, and selected minerals to better understand specifically the fate and transport of mercury in contaminated soils downstream from the Y-12 plant along East Fork Poplar Creek, Tennessee, and more generally in any contaminated soil. The research focused on (1) experiments to quantify the uptake and release of mercury from two clay minerals in the soil, kaolinite and vermiculite, in the presence and absence of dissolved organic matter; (2) release of mercury from cinnabar under oxic and anoxic conditions; (3) characterization of the forms of mercury in the soil using synchrotron X-ray absorption spectroscopic techniques; and, (4) determination of molecular forms of mercury in the presence of natural organic matter. We also leveraged funding from the National Science Foundation to (5) evaluate published approaches for determining sulfur speciation in natural organic matter by fitting X-ray Absorption Near Edge Structure (XANES) spectra obtained at the sulfur K-edge and apply optimized fitting schemes to new measurements of sulfur speciation in a suite of dissolved organic matter samples from the International Humic Substances Society. Lastly, in collaboration with researchers at the University of Colorado and the U.S. Geological Survey in Boulder, Colorado, (6

  14. Mineralogy, chemistry and radioactivity of the heavy minerals in the black sands, along the northern coast of Egypt

    Science.gov (United States)

    Abdel-Karim, Abdel-Aal M.; Zaid, Samir M.; Moustafa, Mohammed I.; Barakat, Mohammed G.

    2016-11-01

    Three hundreds and six black sand samples have been collected from the beach areas along the northern coast of Egypt, parallel and perpendicular to the shoreline. The mineralogy and chemistry of the economic heavy minerals were studied. The grain size distribution of the studied economic minerals shows a unimodal class that mostly in the very fine sand size. The microscopic investigation indicates that the study area is enriched with six economic heavy minerals. These are ilmenite, magnetite, garnet, zircon, rutile and monazite; in addition to leucoxene, arranged in decreasing order of their abundance. The studied black sands suggest a reserve of 329, 183, 24, 21, 7, 1 and 14 thousand tons of ilmenite, magnetite, garnet, zircon, rutile, monazite and leucoxene, respectively. The spherical magnetite grains are higher in Fe2O3 than those of euhedral shaped grains. Ilmenite grains display sub-rounded to euhedral shapes. The altered ilmenite grains have higher TiO2 and lower Fe2O3 in comparison with the euhedral fresh ones. Garnet occurs as angular (49%), sub-spherical (45%), spherical (5%) and euhedral grains (1%). Garnet grains containing mineral inclusions represent 10% of their concentrate. The euhedral garnet grains have Al, Fe, Mn, Mg and Ca that arranged in decreasing order of their abundance. The magnetic zircon fraction obtained from their bulk concentrate is particularly rich in colored grains (70%). Their common colors are red and brown with some malacons. The reddish-brown color of zircon may be due to iron oxide stains. Some magnetic zircon grains are enriched in Hf and REEs contents. Rutile grains are sub-to well rounded (70%), and rich in TiO2. Monazite is enriched in Ce, La, Nd, Th and U. Detectable inclusions of gold, copper, lead, galena, cinnabar, platinum group elements (PGES) and silver are recorded in cassiterite. The radiometric measurements revealed that the black sands of the western zone (4 km2) have high values of specific activity, absorbed

  15. Study by micro-Raman spectroscopy of wall paints (external parts and cross-sections) from reales alcazares of Seville (Spain)

    Science.gov (United States)

    Perez-Rodriguez, José Luis; Centeno, Miguel Angel; Robador, María Dolores; Siguenza, Belinda; Durán, Adrián

    2013-04-01

    The Reales Alcazares of Sevilla was originally builded by the Arabic in the year 913. The Mudejar Palace was built by Christian King Pedro I between 1364 and 1366. At the end of XV century the Catholic Kings, Isabel and Fernando made important transformations especially in the Mudejar Palace. Recently, wall paints from Catholic Kings periods were found during works of conservations in the first floor of the Palace. The study of these paints by non-destructive techniques was considered of great interest in order to determine the technology of manufacture and the originality of the artwork. The main objective of this work was to apply the Raman spectroscopy technique on the surface of the wall and on the different layers of the cross-sections prepared in order to characterize the pigments and the plaster present in these wall paints. Little information was obtained using a portable Raman spectrometer. In this case the dispersive integrated Horiba Jobin-Yvon LabRaman HR800 system was employed. Small samples of black, red, yellow, white and green colour were taken from the artwork. The surface of the samples were directly studed by the Raman spectroscopy instrument using red (785 nm) and green (522 nm) lasers, similarly to non-invasive experimental technique. This technique showed the presence of gypsum (SO4Ca.2H2O) and calcite (CaCO3) in all the studied samples However, the pigments responsible of different colours were not detected. The surface of these wall paints was covered with gypsum and calcite due to contamination. These mineras were also characterized by XRD and SEM-EDX. The presence of these compounds and the heterogeneous surface did not permit the characterization of the pigments responsible of the colour. In order to better characterization of the pigments and plaster used the study was carried out on cross-sections. The black colour was performed using carbon black. Two different red layers were detected one constituted by cinnabar and lead carbonate and

  16. Reconnaissance study of the Taylor Mountains pluton, southwestern Alaska

    Science.gov (United States)

    Hudson, Travis L.; Miller, Marti L.; Klimasauskas, Edward P.; Layer, Paul W.

    2010-01-01

    The Taylor Mountains pluton is a Late Cretaceous to early Tertiary (median age 65 + or ? 2 Ma) epizonal, composite biotite granite stock located about 235 km (145 mi) northeast of Dillingham in southwestern Alaska. This 30 km2 (12 mi2) pluton has sharp and discordant contacts with hornfels that developed in Upper Cretaceous clastic sedimentary rocks of the Kuskokwim Group. The three intrusive phases in the Taylor Mountains pluton, in order of emplacement, are (1) porphyritic granite containing large K-feldspar phenocrysts in a coarse-grained groundmass, (2) porphyritic granite containing large K-feldspar and smaller, but still coarse, plagioclase, quartz, and biotite phenocrysts in a fine-grained groundmass, and (3) fine-grained, leucocratic, equigranular granite. The porphyritic granites have different emplacement histories, but similar compositions; averages are 69.43 percent SiO2, 1.62 percent CaO, 5.23 percent FeO+MgO, 3.11 percent Na2O, and 4.50 percent K2O. The fine-grained, equigranular granite is distinctly felsic compared to porphyritic granite; it averages 75.3 percent SiO2, 0.49 percent CaO, 1.52 percent FeO+MgO, 3.31 percent Na2O, and 4.87 percent K2O. Many trace elements including Ni, Cr, Sc, V, Ba, Sr, Zr, Y, Nb, La, Ce, Th, and Nd are strongly depleted in fine-grained equigranular granite. Trace elements are not highly enriched in any of the granites. Known hydrothermal alteration is limited to one tourmaline-quartz replacement zone in porphyritic granite. Mineral deposits in the Taylor Mountains area are primarily placer gold (plus wolframite, cassiterite, and cinnabar); sources for these likely include scattered veins in hornfels peripheral to the Taylor Mountain pluton. The granite magmas that formed the Taylor Mountains pluton are thought to represent melted continental crust that possibly formed in response to high heat flow in the waning stage of Late Cretaceous subduction beneath interior Alaska.

  17. Multidisciplinary approach for the study of an Egyptian coffin (late 22nd/early 25th dynasty): Combining imaging and spectroscopic techniques

    Science.gov (United States)

    Bracci, S.; Caruso, O.; Galeotti, M.; Iannaccone, R.; Magrini, D.; Picchi, D.; Pinna, D.; Porcinai, S.

    2015-06-01

    and silicates or a gypsum ground, overlapped by lead white. The original pigments were identified as orpiment, cinnabar and red clay, Egyptian blue and green copper based pigments. Some other pigments, such as white lead, Naples yellow, cerulean blue and azurite were only found in the restored areas.

  18. Fate and transport of mercury in soil systems : a numerical model in HP1 and sensitivity analysis

    Science.gov (United States)

    Leterme, Bertrand; Jacques, Diederik

    2013-04-01

    Mercury (Hg) poses threats for human health and the environment, notably due to its persistence and its ability to bioaccumulate in ecosystems. Anthropogenic activities are major contributors of mercury release to soils. Main sources of contamination include manufacturing (chlor-alkali plants, manometer spill), mine tailings from mercury, gold and silver mining industries, wood preservation. The objective of this study was to develop a reactive transport model for simulating mercury fate and transport in the unsaturated zone, and to gain insight in the fate and transport of Hg following anthropogenic soil contamination. The present work is done in the framework of the IMaHg project, which aims at providing recommendations to improve management of sites contaminated by mercury within the SNOWMAN funding framework. A model of mercury fate and transport in soil systems was developed using the reactive transport code HP1 (Jacques and Šimůnek, 2010). The geochemical database THERMODDEM (Blanc et al., 2012) is used, augmented with some speciation data from (Skyllberg, 2012). The main processes accounted for in the model are : Hg aqueous speciation (including complexation with dissolved organic matter (DOM) - humic and fulvic acids, and thiol groups), Hg sorption to solid organic matter (SOM), dissolution of solid phase Hg (e.g. cinnabar HgS(s)), dissolution of Hg non-aqueous liquid phase (NAPL), sunlight-driven Hg(II) reduction to Hg(0), Hg(0) diffusion in the gas phase and volatilization, DOM sorption to soil minerals. Colloid facilitated transport is implicitly accounted for by solute transport of Hg-DOM complexes. Because we focused on soil systems having a high Hg contamination, some processes showing relatively smaller Hg fluxes could be neglected such as vegetation uptake and atmospheric wet and dry deposition. NAPL migration and entrapment is not modelled, as pollution is assumed to be historical and only residual NAPL to be present. Mercury methylation and

  19. Geology of the Ivanhoe Hg-Au district, northern Nevada: Influence of Miocene volcanism, lakes, and active faulting on epithermal mineralization

    Science.gov (United States)

    Wallace, A.R.

    2003-01-01

    The mercury-gold deposits of the Ivanhoe mining district in northern Nevada formed when middle Miocene rhyolitic volcanism and high-angle faulting disrupted a shallow lacustrine environment. Sinter and replacement mercury deposits formed at and near the paleosurface, and disseminated gold deposits and high-grade gold-silver veins formed beneath the hot spring deposits. The lacustrine environment provided abundant meteoric water; the rhyolites heated the water; and the faults, flow units, and lakebeds provided fluid pathways for the hydrothermal fluids. A shallow lake began to develop in the Ivanhoe area about 16.5 Ma. The lake progressively expanded and covered the entire area with fine-grained lacustrine sediments. Lacustrine sedimentation continued to at least 14.4 Ma, and periodic fluctuations in the size and extent of the lake may have been responses to both climate and nearby volcanism. The eruption of rhyolite and andesite flows and domes periodically disrupted the lacustrine environment and produced interfingered flows and lake sediments. The major pulse of rhyolitic volcanism took place between 15.16 ± 0.05 and 14.92 ± 0.05 Ma. High-angle faulting began in the basement about 15.2 Ma, penetrated to and disrupted the paleosurface after 15.10 ± 0.06 Ma, and largely ceased by 14.92 ± 0.05 Ma. Ground motion related to both faulting and volcanism created debris flows and soft-sediment deformation in the lakebeds. Mercury-gold mineralization was coeval with rhyolite volcanism and high-angle faulting, and it took place about 15.2 to 14.9 Ma. At and near the paleosurface, hydrothermal fluids migrated through tuffaceous sediments above relatively impermeable volcanic and Paleozoic units, creating chalcedonic, cinnabar-bearing replacement bodies and sinters. Disseminated gold was deposited in sedimentary and volcanic rocks beneath the mercury deposits, although the hydrologic path between the two ore types is unclear. Higher-grade gold-silver deposits formed in

  20. Asymmetric autocatalysis of pyrimidyl alkanol and its application to the study on the origin of homochirality.

    Science.gov (United States)

    Soai, Kenso; Kawasaki, Tsuneomi; Matsumoto, Arimasa

    2014-12-16

    triggered by the morphology of inorganic chiral crystals such as quartz, sodium chlorate, and cinnabar. Chiral organic crystals of achiral compounds also act as chiral initiators, and during the study of a crystal of cytosine, enantioselective chiral crystal phase transformation of the cytosine crystal was achieved by removal of the water of crystallization in an achiral monohydrate crystal. Enantioselective C-C bond formation was realized on the surfaces of achiral single crystals based on the oriented prochirality of achiral aldehydes. Furthermore, asymmetric autocatalysis of pyrimidyl alkanols is a highly sensitive reaction that can recognize and amplify the significantly small effect of a chiral compound arising solely from isotope substitution of hydrogen, carbon, and oxygen (D/H, (13)C/(12)C, and (18)O/(16)O). These examples show that asymmetric autocatalysis with an amplification of chirality is a powerful tool for correlating the origin of chirality with highly enantioenriched organic compounds. Asymmetric autocatalysis using two β-amino alcohols reveals a reversal of enantioselectivity in the addition of i-Pr2Zn to aldehyde and is one approach toward understanding the mechanism of asymmetric dialkylzinc addition, where heteroaggregates act as the catalytic species.

  1. Mercury toxicity and neurodegenerative effects.

    Science.gov (United States)

    Carocci, Alessia; Rovito, Nicola; Sinicropi, Maria Stefania; Genchi, Giuseppe

    2014-01-01

    Mercury is among the most toxic heavy metals and has no known physiological role in humans. Three forms of mercury exist: elemental, inorganic and organic. Mercury has been used by man since ancient times. Among the earliest were the Chinese and Romans, who employed cinnabar (mercury sulfide) as a red dye in ink (Clarkson et al. 2007). Mercury has also been used to purify gold and silver minerals by forming amalgams. This is a hazardous practice, but is still widespread in Brazil's Amazon basin, in Laos and in Venezuela, where tens of thousands of miners are engaged in local mining activities to find and purify gold or silver. Mercury compounds were long used to treat syphilis and the element is still used as an antiseptic,as a medicinal preservative and as a fungicide. Dental amalgams, which contain about 50% mercury, have been used to repair dental caries in the U.S. since 1856.Mercury still exists in many common household products around the world.Examples are: thermometers, barometers, batteries, and light bulbs (Swain et al.2007). In small amounts, some organo mercury-compounds (e.g., ethylmercury tiosalicylate(thimerosal) and phenylmercury nitrate) are used as preservatives in some medicines and vaccines (Ballet al. 2001).Each mercury form has its own toxicity profile. Exposure to Hg0 vapor and MeHg produce symptoms in CNS, whereas, the kidney is the target organ when exposures to the mono- and di-valent salts of mercury (Hg+ and Hg++, respectively)occur. Chronic exposure to inorganic mercury produces stomatitis, erethism and tremors. Chronic MeHg exposure induced symptoms similar to those observed in ALS, such as the early onset of hind limb weakness (Johnson and Atchison 2009).Among the organic mercury compounds, MeHg is the most biologically available and toxic (Scheuhammer et a!. 2007). MeHg is neurotoxic, reaching high levels of accumulation in the CNS; it can impair physiological function by disrupting endocrine glands (Tan et a!. 2009).The most

  2. 矿物药朱砂加工流程中可溶性重金属含量的仿生提取-ICP-OES测定方法%Determination method of soluble heavy metals in mineral medicine cinnabaris in process of production and processing by ICP-OES with bionic extraction and microwave digestion technology

    Institute of Scientific and Technical Information of China (English)

    蒋秋桃; 曾丽; 马杰; 李文莉; 丁野; 李洁

    2016-01-01

    收集朱砂生产加工工艺流程中不同工艺点的样品,采用仿生提取−电感耦合等离子体发射原子光谱法(仿生提取-ICP-OES法)对朱砂样品中可溶性重金属含量进行测定。研究结果表明:仿生提取-ICP-OES法能满足13种重金属同时检测要求,13种重金属线性范围均在0.1~1000.0μg/L之间,线性相关系数为0.9901~1.0000,检出限为0.0893~16.0414μg/L;该方法重复性相对标准偏差DRS均小于10.0%,精密度的DRS均小于7.1%,加样回收率为83.0%~117.5%,满足检测要求;在工艺流程中,朱砂的可溶性重金属含量呈逐步降低趋势,参照《药用植物及制剂进出口绿色行业标准》的限量标准,仅有H-5的Cd超出标准及H-3,H-4和H-5样品的Pb超出标准;仿生提取-ICP-OES法简单、快速,准确性及精度高,能够通过同时检测朱砂加工工艺过程中13种可溶性重金属含量检测,为实时监控朱砂加工工艺质量提供参考依据,有助于完善并确定最佳的朱砂生产加工流程。%Cinnabar samples with different processes in production and processing process were collected. Soluble heavy metals in cinnabaris were determined in the process of production and processing by inductively coupled plasma-optical emission spectrometry(ICP-OES) with bionic extraction and microwave digestion technology. The results show that 13 kinds of elements have excellent linearity over the range of 0.1−1 000.0 μg/L with a correlation coefficient of 0.990 1−1.000 0. Limits of detection are in the range of 0.089 3−16.041 4μg/L. Relative standard deviation DRS of the repeatability is less than 10.0%. DRS of precision is lower than 7.1%. Spike recoveries in the range of 83.0%−117.5%are obtained. In the process, the content of soluble heavy metals’ gradually reduces. With reference to green trade standards of importing&exporting medicinal plants&preparations, none of the samples surpass the legal limit for

  3. Las yeserías del Patio de las Doncellas del Real Alcázar de Sevilla. Avance de resultados de la caracterización de materiales y la técnica

    Directory of Open Access Journals (Sweden)

    Calero-Castillo, Ana Isabel

    2016-06-01

    Full Text Available This article presents the initial contributions of the plasterworks polychrome research carried out at Courtyard of the Maidens in the Alcazar of Seville. This spectacular courtyard is located within the King Pedro I Palace (1356 – 1366, which is considered one of the most representative buildings mudejar architecture. This palace has been one of the residences of the Spanish monarchs over the time, thus it is one of the oldest palaces still in use. Consequently many interventions took place in the building, especially on the polychrome decoration. As part of the field-work, samples were collected aiming to identify the different polychrome interventions and the materials used in each of them. Different techniques were used to analyse the samples (optical microscopy, electron microscopy SEM / EDX, chromatographic methods and X-ray diffraction. The results of the study confirmed that successive interventions occurred over the original work. Natural pigments, such as red lead, cinnabar, natural azurite and malachite, were found in the deeper strata (i.e. the most likely original work. Industrial pigments, such as ultramarine blue or emerald green, were identified in the upper layers (i.e. the latest interventions.Este artículo presenta un avance de resultados del estudio de la policromía de las yeserías del Patio de las Doncellas del Real Alcázar de Sevilla. Este espectacular patio es parte del Palacio de Pedro I (1356- 1366, considerado como una de las obras mudéjares de mayor relevancia y uno de los palacios más antiguos todavía en uso. Su condición continuada como residencia de los monarcas españoles, ha permitido su conservación, pero también ha supuesto numerosas intervenciones que se agudizan en las policromías de los revestimientos decorativos. Tras un completo trabajo de campo se realizó un muestreo de la zona con el objetivo de conocer la naturaleza de los materiales e identificar las intervenciones realizadas. Para ello se

  4. Biogeochemistry of mercury in soils and sediments in a mining-impacted watershed, California

    Science.gov (United States)

    Holloway, J. M.; Goldhaber, M. B.

    2004-12-01

    The East Davis Creek watershed, located in the California Coast Ranges, is host to historic mines that provided mercury for recovery of gold in the Sierra Nevada goldfields in the mid-to-late 1800s. Bedrock in this watershed includes marine sedimentary rock, serpentinite, and hydrothermally altered serpentinite. Cinnabar (HgS) found in the altered serpentinite is the primary ore mineral for mercury. We evaluated the hypothesis that mercury is sequestered in soil organic matter downstream from source areas, releasing a fraction as water-soluble methylmercury. Microbial biomass and the presence of sulfur-reducing bacteria implicated in mercury methylation were quantified using phospholipid fatty acid (PLFA) data. Methylation incubations were performed on soil and sediment inoculated with water from Davis Creek Reservoir and sealed in glass containers under an anoxic headspace for 21 days. Methylmercury was measured on extracts of the soils at the start and at the end of the incubation period. Two sources of mercury to stream sediments, a soil with an altered serpentinite parent and mine tailings, were incubated. Stream sediment, an overbank deposit soil and a wetland soil forming from these sediments were also incubated. The overbank deposit soil is periodically flooded. The wetland soil around the edge of Davis Creek Reservoir is perennially saturated with water. The altered serpentinite soil and mine tailings had the highest total mercury concentrations (170 and 150 ng Hg /g, respectively). Total mercury concentrations in stream sediments are low (¡Ü1 ng Hg/g), with higher mercury concentrations in the overbank (3 ng/g) and wetland soils (18 ng Hg/g). Mercury leached from altered serpentinite soils and mine tailings may be transported downstream and sequestered through sorption to organic matter in the overbank and wetland soils. PLFA biomarkers for Desulfobacter (10Me16:0) and Desulfovibrio (i17:1) were present in all incubated materials, with lower

  5. 安宫牛黄丸体外安全性评价方法的研究%In Vitro Safety Evaluation Study of Angong Niuhuang Wan

    Institute of Scientific and Technical Information of China (English)

    王欣美; 张甦; 王枚博; 夏晶; 李丽敏; 王柯; 季申

    2015-01-01

    To study a vitro extraction method to determine soluble mercury and mercury species in Angong Niuhuang Wan and investigate a vitro safety evaluation method ,the best extraction scheme was determined after a great deal of conditioning experi-ments focusing on how the solvent ,purification ,duration of extraction and purification etc impact on mercury extraction .Soluble mercury was determined by inductively coupled plasma mass spectrometry and mercury species were determined by high perform-ance liquid chromatography/inductively coupled plasma mass spectrometry .Result show that the best extraction method of solu-ble mercury and its species was ultrasonic extraction in artificial intestinal juice at 37 ℃ for 2 hours ,letting it stand for 20 hours and taking the supernatant .The method was reproducible ,which could simulate the human body environment to maximum ex-tent .Methyl mercury ,ethyl mercury and Hg2+ were not found in the extracts of Angong Niuhuang ,although the content of sol-uble mercury was high .It was concluded that the method could be applied to the vitro extraction and determination of soluble mercury and mercury species in Chinese traditional medicines containing cinnabar .Methyl mercury ,ethyl mercury and Hg2+could be taken as the targets of in vitro safety evaluation of Angong Niuhuang .%研究安宫牛黄丸中可溶性汞及三种毒性汞价态的体外溶出检测方法,探讨安宫牛黄丸体外安全性评价方法。通过试验研究提取溶剂、净化方式、提取、净化时间等因素对溶出的影响,确定最佳的提取方案。使用电感耦合等离子体质谱法测定可溶性汞,高效液相色谱法-电感耦合等离子体质谱法联用测定三种汞价态。安宫牛黄丸中可溶性汞及三种毒性汞价态的最佳提取方法为:用人工肠液在37℃下超声处理2 h ,提取液静置20 h后取上清液。方法重现性好,最大程度地模拟药物在体内的吸收环境。安宫牛黄丸

  6. A microencapsulation process of liquid mercury by sulfur polymer stabilization/solidification technology. Part I: Characterization of materials

    Directory of Open Access Journals (Sweden)

    López-Delgado, A.

    2012-02-01

    Full Text Available European Directives consider mercury a priority hazardous substance due to its adverse effects on human health and the environment. In response to environmental concerns, a microencapsulation process has been developed within the European LIFE program as a long-term storage option for mercury. This process leads to the obtainment of a stable concrete-like sulfur matrix that allows the immobilization of mercury. The final product, in the form of a solid block containing up to 30 % Hg, exhibits excellent mechanical properties (compressive strength 53-61MPa and flexural strength 7-10 MPa, low porosity (0.57 % PHe, very low total pore volume (0.63x10-2 cm3 g-1, and extremely low permeability (coefficient of water absorption by capillarity 0.07 g cm-2. Toxicity characteristic leaching tests reveal a mercury concentration in leachates well below the 0.2 mg L-1 set out in US EPA Land Disposal Restrictions (LDRs. The values of mercury vapor emissions of final products were lower than those of cinnabar and metacinnabar.

    Resumen Las Directivas Europeas consideran al mercurio una sustancia de peligrosidad prioritaria debido a sus efectos adversos sobre la salud humana y sobre el medio ambiente. En respuesta a estas preocupaciones ambientales, y dentro del Programa Europeo LIFE, se ha desarrollado un proceso de microencapsulación como una opción al almacenamiento a largo plazo del mercurio. Con este proceso se obtiene un material estable, tipo concreto, de matriz de azufre que permite la inmovilización del mercurio. El producto final, en forma de un bloque sólido, contiene hasta un 30 % de Hg, presenta excelentes propiedades mecánicas (resistencia a la compresión 53-61 MPa, y a la flexión 7-10 MPa, baja porosidad (0,57 % PHe, muy bajo volumen total de poro (0,63 x 10-2 cm3 g-1 y una permeabilidad extremadamente baja (coeficiente de absorción de

  7. 汞和金属离子及多硫化物对木瓜蛋白酶活性的抑制作用%Inhibition of cysteine protease papain by metal ions and polysulfide complexes, especially mercuric ion

    Institute of Scientific and Technical Information of China (English)

    姜军; 杨晓达; 王夔

    2007-01-01

    Abstract: Aim Cysteine proteases are closely associated with many human and non-human pathological processes and are potential targets for metal ions especially Hg2+ and the related species. In the present work, on the basis of to the general study on the effects of some metal ions on the activity of papain, a well-known representative of cysteine protease family, the inhibitory effects of Hg2+ and polysulfide complexes were studied. Results All the metal ions tested (Hg2+, Cu2+, Ag+, Au3+, Zn2+, Cd2+, Fe3+, Mn2+, Pb2+, Yb3+) inhibit the activity of papain anda good correlation between the inhibitory potency and softness-and-hardness was observed. Among the metals, Hg2+ was shown to be a potent inhibitor of papain with a Ki of 2 × 10-7 mol· L-1 among. Excessive amounts of glutathione and cysteine could reactivate the enzyme activity of papain deactivated by Hg2+. These evidences supported that Hg2+ might bind to the catalytic site of papain. Interestingly,Hg (Ⅱ) polysulfide complexes were for the first time found to inhibit papain with a Ki of 7 × 10-6 mol ·L-1, whose potency is close to a well known mercury compound, thimerosal (Ki=2.7 × 10-6). In addition, Hg (Ⅱ) polysulfide complexes exhibit good permeability (1.9 × 10-5cm·s-1) to caco-2 monolayer. Conclusion These results suggested that mercury polysulfide complexes might be potential bioactive species in the interaction with cysteine proteases and other- SH-content proteins, providing a new clue to understand the mechanism of the toxicological and pharmacological actions of cinnabar and other insoluble mercury compounds.%目的 半胱氨酸蛋白酶参与了很多动植物生理过程和病理过程,是Hg2+及其化合物作用的潜在靶点.木瓜蛋白酶是半胱氨酸蛋白酶家族中最具代表性、研究最为广泛深入的一种蛋白酶,本文以木瓜蛋白酶为模型,研究了汞等金属离子及其化合物对半胱氨酸蛋白酶活性的抑制作用.结果 Hg2+对木瓜蛋白酶