Cyanide Remediation: Current and Past Technologies C.A
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Mercury Exposure Among Artisanal Gold Miners in Madre De Dios, Peru: a Cross-Sectional Study
J. Med. Toxicol. DOI 10.1007/s13181-012-0252-0 CDC/ATSDR TOXICOLOGY REPORT Mercury Exposure Among Artisanal Gold Miners in Madre de Dios, Peru: A Cross-sectional Study Ellen E. Yard & Jane Horton & Joshua G. Schier & Kathleen Caldwell & Carlos Sanchez & Lauren Lewis & Carmen Gastaňaga # American College of Medical Toxicology (outside the USA) 2012 Abstract Results One third (34.0 %) of participants were gold miners. Introduction Exposure to mercury, a toxic metal, occurs All participants had detectable urine total mercury (GM, primarily from inhaling mercury vapors or consuming 5.5 μg/g creatinine; range, 0.7–151 μg/g creatinine) and methylmercury-contaminated fish. One third of all anthro- 91 % had detectable blood methylmercury (GM, 2.7 μg/L; pogenic mercury emissions worldwide are from artisanal range, 0.6–10 μg/L); 13 participants (13 %) reported having gold mining, which uses mercury to extract gold. Although kidney dysfunction or a neurological disorder. Urine total recent reports suggest that the Madre de Dios region in Peru mercury concentrations were higher among people who (with >30,000 artisanal miners) has extensive mercury con- heated gold–mercury amalgams compared with people tamination, residents had never been assessed for mercury who never heated amalgams (p<0.05); methylmercury con- exposure. Thus, our objective was to quantify mercury centrations were higher among fish consumers compared exposure among residents of an artisanal mining town in with nonfish consumers (p<0.05). Madre de Dios and to assess risk factors for exposure. Conclusion Our findings suggest that mercury exposure Methods We conducted a cross-sectional assessment of 103 may be widespread in Huaypetue. -
From Acrolein Cyanohydrin
Agric. Biol. Chem., 52 (2), 589-591, 1988 589 Note carried out at iuu~zuirc under an increased pressure/' Here, we present a novel single-step synthesis of 5-(/?- methylthioethyl)hydantoin (2), in which we employed Single-step Synthesis of 5-(j6- single-step reactions of acrolein cyanohydrin (AC, 4), Methylthioethyl)hydantoin methyl mercaptan and ammoniumcarbonate in polar solvents (the AC method), and of acrolein (AL, 1), from Acrolein Cyanohydrin hydrogen cyanide, methyl mercaptan and ammonium and Acrolein carbonate (the ALmethod), accompanied with the for- mation of a-ureido-y-methylthiobutyramide (UMA, 5). Chisei Shibuya and Shunji Ouchi* By an alkaline hydrolysis of these products, dl- methionine (MT, 3) was obtained in an 85%yield on the Food Products & Pharmaceuticals Plant, bases of acrolein cyanohydrin and of acrolein. Asahi Chemical Industry Co., Ltd., Whenthe single-step hydantoination was carried out 6-2700 Asahimachi, Nobeoka, from ACor AL, a mixture of 2 and 5 was obtained. Miyazaki 882, Japan Approximately 12mol% of 5 was formed in each case of *Analytical Research Center, using AL and AC. Asahi Chemical Industry Co., Ltd., These new reactions are summarized in the following 1-3-1 Yako, Kawasaki-ku, Kawasaki-shi, equations: Kanagawa 210, Japan According to this procedure, acrolein and acrolein Received July 27, 1987 cyanohydrin, which are unstable to alkali, were not polymerized by the presence of excess ammoniumcar- bonate,-and the desired reaction proceeded in high yields. Single-step hydantoination of ACusing methanol as the A number of methods for DL-methionine synthesis solvent was carried out, and the effect of quantities of through the hydantoin intermediate have been reported methyl mercaptan, hydrogen cyanide and ammonium since Pierson1* obtained methionine in a 50%yield starting carbonate on the yield of MTwas investigated. -
Cyanide Poisoning and How to Treat It Using CYANOKIT (Hydroxocobalamin for Injection) 5G
Cyanide Poisoning and How to Treat It Using CYANOKIT (hydroxocobalamin for injection) 5g 1. CYANOKIT (single 5-g vial) [package insert]. Columbia, MD: Meridian Medical Technologies, Inc.; 2011. Please see Important Safety Information on slides 3-4 and full Prescribing Information for CYANOKIT starting on slide 33. CYANOKIT is a registered trademark of SERB Sarl, licensed by Meridian Medical Technologies, Inc., a Pfizer company. Copyright © 2015 Meridian Medical Technologies, Inc., a Pfizer company. All rights reserved. CYK783109-01 November/2015. Indication and Important Safety Information……………………………………………………………………………….………..…..3 . Identifying Cyanide Poisoning……………………………………………………………………………………………………………….…………….….5 . How CYANOKIT (hydroxocobalamin for injection) Works……………………………………………………………….12 . The Specifics of CYANOKIT…………………………………………………………………………………………………………………………….………17 . Administering CYANOKIT………………………………………………………………………………………………………………………………..……….21 . Storage and Disposal of CYANOKIT…................................................................................................................................26 . Grant Information for CYANOKIT……………………………………………………………………………………………………………………....30 . Full Prescribing Information………………………………………………………………………………………………….………………………………33 Please see Important Safety Information on slides 3-4 and full Prescribing Information for CYANOKIT starting on slide 33. CYANOKIT (hydroxocobalamin for injection) 5 g for intravenous infusion is indicated for the treatment of known or suspected cyanide poisoning. -
Profits from the Past
Reprocessing and tailings reduction.qxp_proof 29/04/2020 09:50 Page 1 REPROCESSING AND TAILINGS REDUCTION In Colombia, AuVert's technology is being combined with CDE's experience in dewatering Profits from the past and tailings management to extract the remaining precious metals existing in the ground, while removing up to 93% of residual mercury which has to date prevented this land from being used by the local population reasons why mining companies may be cautious about using tailings as backfill material or relocating current day ‘waste’ to an inaccessible area of the mine, according to Gerritsen. “As technology improves, the opportunity to recover more of the metals/minerals increases,” he said. “There are elements where that may not be the case – coal ash, for example, cannot be reprocessed but can be used to produce cement. While tailings dam liabilities and falling water resources are There are certainly opportunities with gold, affecting the ability of miners to start new mines, or expand copper and even coal, for instance.” The strategies companies ultimately pursue for existing ones, these issues are strengthening the case for these ‘waste streams’ depend on the technology reprocessing and retreating ‘waste’ sites or streams. Dan available and the safety of the facilities, Gerritsen Gleeson explores an increasingly diverse market focused on remarked. revenue generation and risk reduction “For instance, it may not be economically viable to reprocess the material currently in a ith improved transparency around recycling and thickening, or SART, plant from BQE tailings storage facility and, therefore, the owner tailings dams and waste stockpiles now Water will only bolster cash reserves through the may decide to close it or put it into a non-active Wpart and parcel of being a responsible recovery of a high-grade saleable copper sulphide state,” he said. -
Hazardous Chemicals in Secondhand Marijuana Smoke
Hazardous Chemicals in Secondhand Marijuana Smoke “The following 33 marijuana smoke constituents included in Table 1 are listed under 33 Chemicals Proposition 65 as causing cancer: acetaldehyde, acetamide, acrylonitrile, 4- aminobiphenyl, arsenic, benz[a]anthracene, benzene, benzo[a]pyrene, That Can benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, benzofuran, 1,3- butadiene, cadmium, carbazole, catechol, chromium (hexavalent compounds), Cancer chrysene, dibenz[a,h]anthracene, dibenz[a,i]pyrene, dibenzo[a,e]pyrene, “Many of the chemical diethylnitrosamine, dimethylnitrosamine, formaldehyde, indeno[1,2,3,-c,d]pyrene, constituents that have been isoprene, lead, mercury, 5-methylchrysene, naphthalene, nickel, pyridine, and identified in marijuana smoke quinoline.” are carcinogens.” 2009 OEHHA document, Evidence on the Carcinogenicity of Marijuana Smoke Hydrogen Cyanide interferes with the normal use of oxygen by nearly every organ of Hydrogen the body. Exposure to hydrogen cyanide (AC) can be rapidly fatal. It has whole-body (systemic) effects, particularly affecting those organ systems most sensitive to low Cyanide oxygen levels: the central nervous system (brain), the cardiovascular system (heart Is the same chemical used for and blood vessels), and the pulmonary system (lungs). Hydrogen cyanide (AC) is a chemical weapons. chemical warfare agent (military designation, AC). Ammonia gas is a severe respiratory tract irritant. Can cause severe irritation of the Ammonia nose and throat. Can cause life-threatening accumulation of fluid in the lungs Household cleaner used on (pulmonary edema). Symptoms may include coughing, shortness of breath, difficult floors and toilets. There is 3 breathing and tightness in the chest. Symptoms may develop hours after exposure times more in secondhand and are made worse by physical effort. -
Mining's Toxic Legacy
Mining’s Toxic Legacy An Initiative to Address Mining Toxins in the Sierra Nevada Acknowledgements _____________________________ ______________________________________________________________________________________________________________ The Sierra Fund would like to thank Dr. Carrie Monohan, contributing author of this report, and Kyle Leach, lead technical advisor. Thanks as well to Dr. William M. Murphy, Dr. Dave Brown, and Professor Becky Damazo, RN, of California State University, Chico for their research into the human and environmental impacts of mining toxins, and to the graduate students who assisted them: Lowren C. McAmis and Melinda Montano, Gina Grayson, James Guichard, and Yvette Irons. Thanks to Malaika Bishop and Roberto Garcia for their hard work to engage community partners in this effort, and Terry Lowe and Anna Reynolds Trabucco for their editorial expertise. For production of this report we recognize Elizabeth “Izzy” Martin of The Sierra Fund for conceiving of and coordinating the overall Initiative and writing substantial portions of the document, Kerry Morse for editing, and Emily Rivenes for design and formatting. Many others were vital to the development of the report, especially the members of our Gold Ribbon Panel and our Government Science and Policy Advisors. We also thank the Rose Foundation for Communities and the Environment and The Abandoned Mine Alliance who provided funding to pay for a portion of the expenses in printing this report. Special thanks to Rebecca Solnit, whose article “Winged Mercury and -
Uranium Isanaturallyoccurring,Verydense,Metallic Definition Andcharacteristics Deposits Definition, Mineralogyand Proportion Ofu-235Tobetween 3And5percent
Uranium March 2010 Definition, mineralogy and Symbol U nt deposits Atomic number 92 opme vel Definition and characteristics Atomic weight 238.03 de l Uranium is a naturally occurring, very dense, metallic 3 ra Density at 298 K 19 050 kg/m UK element with an average abundance in the Earth’s crust ne mi of about 3 ppm (parts per million). It forms large, highly Melting point 1132 °C e bl charged ions and does not easily fit into the crystal struc- Boiling point 3927 °C na ai ture of common silicate minerals such as feldspar or mica. st Accordingly, as an incompatible element, it is amongst the Mineral Hardness 6 Moh’s scale su r last elements to crystallise from cooling magmas and one -8 f o Electrical resistivity 28 x 10 Ohm m re of the first to enter the liquid on melting. nt Table 1 Selected properties of uranium. Ce Minerals Under oxidizing conditions uranium exists in a highly soluble form, U6+ (an ion with a positive charge of 6), and is therefore very mobile. However, under reducing conditions Other physical properties are summarised in Table 1. it converts to an insoluble form, U4+, and is precipitated. It is these characteristics that often result in concentrations Mineralogy of uranium that are sufficient for economic extraction. Uranium is known to occur in over 200 different minerals, but most of these do not occur in deposits of sufficient Uranium is naturally radioactive. It spontaneously decays grade to warrant economic extraction. The most common through a long series of alpha and beta particle emissions, uranium-bearing minerals found in workable deposits are ultimately forming the stable element lead. -
The Detoxification of Gold-Mill Tailings with Hydrogen Peroxide by A
J. S. At,. Inst. Min. Metal/., vol. 87, no. 9. Sap. 1987. pp. 279-283. The detoxification of gold-mill tailings with hydrogen peroxide by A. GRIFFITHS., H. KNORRE**, S. GOS:I:,and R. HIGGINS§ SYNOPSIS Hydrogen peroxide is gaining acceptance as a reagent for the treatment of.mining effluents c?ntaininQ cyanide. In this paper some of the chemical and environmental aspects of treatment with hydrogen peroxide are discussed, and one way of improving the economics of the process is described. This is known as selective detoxification, which involves the oxidation of the less stable (cyanide) complexes while not affecting the more stable complexes, which contribute very little to the concentration of free cyanide or to the toxicity of the treated water. SAMEVATTING Waterstofperoksied word al hoe meer aanvaar as 'n reagens vir die behandeling van mynuitvl?eisels w~t si~ni~d bevat. Sommige van die chemiese en omgewingsaspekte van behandeling met waterstofperoks,led word In hlerdle referaat bespreek en een manier om die ekonomie van die proses te verbeter word beskryf. Dlt s~aan bekend. as selektiewe ontgifting en behels die oksidasie van die minder stabiele (sianied) komplekse sonder om die meer stablele komplekse wat baie min tot die konsentrasie van vry sianied, of tot die giftigheid van die behandelde water bydra, te be"invloed. Introduction The detoxification plant supplied by Degussa for use Oxidation of CN- at the gold mine of Ok Tedi Mining Ltd in Papua New CN~ + HP2 CNO- + H2O Guinea represents the first large-scale application of - Hydrolysis of CNO- hydrogen peroxide for the detoxification of tailings from CNO- + 2 H+ a cyanidation plant. -
Hydroxyacetonitrile (HOCH2CN) As a Precursor for Formylcyanide (CHOCN), Ketenimine (CH2CNH), and Cyanogen (NCCN) in Astrophysical Conditions
A&A 549, A93 (2013) Astronomy DOI: 10.1051/0004-6361/201219779 & c ESO 2013 Astrophysics Hydroxyacetonitrile (HOCH2CN) as a precursor for formylcyanide (CHOCN), ketenimine (CH2CNH), and cyanogen (NCCN) in astrophysical conditions G. Danger1, F. Duvernay1, P. Theulé1, F. Borget1, J.-C. Guillemin2, and T. Chiavassa1 1 Aix-Marseille Univ, CNRS, PIIM UMR 7345, 13397 Marseille, France e-mail: [email protected] 2 Institut des Sciences Chimiques de Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France Received 8 June 2012 / Accepted 19 November 2012 ABSTRACT Context. The reactivity in astrophysical environments can be investigated in the laboratory through experimental simulations, which provide understanding of the formation of specific molecules detected in the solid phase or in the gas phase of these environments. In this context, the most complex molecules are generally suggested to form at the surface of interstellar grains and to be released into the gas phase through thermal or non-thermal desorption, where they can be detected through rotational spectroscopy. Here, we focus our experiments on the photochemistry of hydroxyacetonitrile (HOCH2CN), whose formation has been shown to compete with aminomethanol (NH2CH2OH), a glycine precursor, through the Strecker synthesis. Aims. We present the first experimental investigation of the ultraviolet (UV) photochemistry of hydroxyacetonitrile (HOCH2CN) as a pure solid or diluted in water ice. Methods. We used Fourier transform infrared (FT-IR) spectroscopy to characterize photoproducts of hydroxyacetonitrile (HOCH2CN) and to determine the different photodegradation pathways of this compound. To improve the photoproduct identifications, irradiations of hydroxyacetonitrile 14N and 15N isotopologues were performed, coupled with theoretical calculations. -
Adapting to Climate Change: a Guide for the Mining Industry
Adapting to Climate Change: A Guide for the Mining Industry Julia Nelson, Manager, Advisory Services Ryan Schuchard, Manager, Climate and Energy This guide is part of a BSR This primer on climate change adaptation summarizes how companies in the industry series. For additional mining industry are reporting on climate change risks and opportunities, and highlights current and emerging best practices and guidance for E&U companies climate adaptation briefs, please visit www.bsr.org/adaptation. on how to develop a proactive approach to climate change adaptation. In this brief, mining refers to companies involved in the extraction of a broad range of metals and minerals, including precious metals, base metals, industrial Contents and Methodology minerals, coal, and uranium. This brief covers: Introduction Reporting on Risks and Opportunities: A synopsis Due to the wide geographic distribution of mining operations, climate change, including temperature and precipitation shifts as well as more frequent and based on reporting of climate severe extreme weather events, will have complex impacts on the sector. risk in 2009 by 41 mining Climactic conditions will affect the stability and effectiveness of infrastructure and companies to the Carbon equipment, environmental protection and site closure practices, and the Disclosure Project (CDP). availability of transportation routes. Climate change may also impact the stability and cost of water and energy supplies. Current Practices: An outline of actions related to climate Some examples: Warming temperatures will increase water scarcity in some change adaptation based on locations, inhibiting water-dependent operations, complicating site rehabilitation reporting from the CDP, and bringing companies into direct conflict with communities for water resources. -
Substituent and Solvent Effects on HCN Elimination from L-Aryl-L,2,2-Tricyanoethanes [1]
Substituent and Solvent Effects on HCN Elimination from l-Aryl-l,2,2-tricyanoethanes [1] Fouad M. Fouad Max-Planck-Institut für Biochemie, D-8033 Martinsried bei München, West Germany and Patrick G. Farrell Department of Chemistry, McGill University, Montreal, Quebec, Canada, H3A 2K6 Z. Naturforsch. 34b, 86-94 (1979); received August 2, 1978 1,2,2-Tricyanoethanes, Elimination of HCN The elimination of HCN from 9-dicyanomethyl-fluorene (2), 1,1-diphenyl-1,2,2- tricyanoethane (3), and 2-phenyl-I,l,2-tricyano-propane (4) in anhydrous methanol has been studied and shown to occur via an (E l)anion mechanism. Elimination of HCN from 2 in acidic, buffered and MeO~/MeOH solutions have also been studied. Addition of water or benzene to the reaction medium shifts the mechanism to (E 1 CB)R. Elimination of HCN from N,N-dimethyl-4-(I,I,2-tricyanoethyl) aniline (5) in anhydrous methanol occurs via an (E 1 CB)r mechanism and the kinetics indicate that addition of HCN to the product alkene occurs. Activation parameters, isotope effects and solvent effects have been examined in an effort to obtain information about the nature of the transition states of these reactions. Introduction tion via the ElcB mechanism [2-5]. Within the The base catalyzed elimination of HCN from overall ElcB mechanistic scheme a number of various polycyanoethane derivatives has been the possible rate-determining steps may be envisaged, subject of several mechanistic investigations because giving rise to different kinetic schemes, and exam- of the potential stabilization of an intermediate ples of elimination via each of these pathways have carbanion in such systems, thus favouring elimina- been reported [6]. -
Acids and Bases
Name Date Class CHAPTER 14 REVIEW Acids and Bases SECTION 1 SHORT ANSWER Answer the following questions in the space provided. 1. Name the following compounds as acids: sulfuric acid a. H2SO4 sulfurous acid b. H2SO3 hydrosulfuric acid c. H2S perchloric acid d. HClO4 hydrocyanic acid e. hydrogen cyanide 2. H2S Which (if any) of the acids mentioned in item 1 are binary acids? 3. Write formulas for the following acids: HNO2 a. nitrous acid HBr b. hydrobromic acid H3PO4 c. phosphoric acid CH3COOH d. acetic acid HClO e. hypochlorous acid 4. Calcium selenate has the formula CaSeO4. H2SeO4 a. What is the formula for selenic acid? H2SeO3 b. What is the formula for selenous acid? 5. Use an activity series to identify two metals that will not generate hydrogen gas when treated with an acid. Choose from Cu, Ag, Au, Pt, Pd, or Hg. 6. Write balanced chemical equations for the following reactions of acids and bases: a. aluminum metal with dilute nitric acid ϩ → ϩ 2Al(s) 6HNO3(aq) 2Al(NO3)3(aq) 3H2(g) b. calcium hydroxide solution with acetic acid ϩ → ϩ Ca(OH)2(aq) 2CH3COOH(aq) Ca(CH3COO)2(aq) 2H2O(l ) MODERN CHEMISTRY ACIDS AND BASES 117 Copyright © by Holt, Rinehart and Winston. All rights reserved. Name Date Class SECTION 1 continued 7. Write net ionic equations that represent the following reactions: a. the ionization of HClO3 in water ϩ → ϩ ϩ Ϫ HClO3(aq) H2O(l ) H3O (aq) ClO3 (aq) b. NH3 functioning as an Arrhenius base ϩ → ϩ ϩ Ϫ NH3(aq) H2O(l ) ← NH4 (aq) OH (aq) 8.