Reactivity of mercury from gold mining activities in darkwater ecosystems
Mercury (Hg) emissions from informal gold mining operations represent a serious environmental problem in developing countries. In Amazonia, from 70 to 170 tonnes (t) of Hg are discharged annually. The extent of biota contamination is also widespread. Mercury must be rendered soluble and then convert...
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| Veröffentlicht in: | Ambio 1998-03, Vol.27 (2), p.92-98 |
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| creator | Meech, J.A Veiga, M.M Tromans, D. (British Columbia Univ., Vancouver (Canada)) |
| description | Mercury (Hg) emissions from informal gold mining operations represent a serious environmental problem in developing countries. In Amazonia, from 70 to 170 tonnes (t) of Hg are discharged annually. The extent of biota contamination is also widespread. Mercury must be rendered soluble and then converted into methylmercury in order to accumulate in the food-chain. Generally, it is regarded that Hg must be oxidized to produce significant dissolution. In this work, we examine the stability of mercury as the unoxidized aqueous elemental Hg o (aq.) in aquatic environments. In contact with organic acids, evidence of Hg-organic complex formation has been found from both thermodynamic analysis and electrochemical experiments. Although methylation of these soluble species is not fully understood, formation of such complexes in darkwater rivers must contribute to increased bioavailability. |
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Although methylation of these soluble species is not fully understood, formation of such complexes in darkwater rivers must contribute to increased bioavailability.</description><identifier>ISSN: 0044-7447</identifier><identifier>EISSN: 1654-7209</identifier><language>eng</language><publisher>Royal Swedish Academy of Sciences</publisher><subject>Acid soils ; BIOAVAILABILITY ; BIODISPONIBILIDAD ; BIODISPONIBILITE ; CONTAMINANTES INDUSTRIALES ; COURS D'EAU ; CURSOS DE AGUA ; DEVELOPING COUNTRIES ; Freshwater ; Gold mining ; INDUSTRIAL POLLUTANTS ; MERCURE ; MERCURIO ; MERCURY ; Mining ; PAISES EN DESARROLLO ; PAYS EN DEVELOPPEMENT ; POLLUANT INDUSTRIEL ; POLLUTION DE L'EAU ; POLUCION DEL AGUA ; RIVERS ; Sedimentary soils ; Sediments ; Soil air ; Soil pollution ; Soil water ; WATER POLLUTION</subject><ispartof>Ambio, 1998-03, Vol.27 (2), p.92-98</ispartof><rights>Copyright 1998 Royal Swedish Academy of Sciences</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/4314693$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/4314693$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,777,781,800,57998,58231</link.rule.ids></links><search><creatorcontrib>Meech, J.A</creatorcontrib><creatorcontrib>Veiga, M.M</creatorcontrib><creatorcontrib>Tromans, D. (British Columbia Univ., Vancouver (Canada))</creatorcontrib><title>Reactivity of mercury from gold mining activities in darkwater ecosystems</title><title>Ambio</title><description>Mercury (Hg) emissions from informal gold mining operations represent a serious environmental problem in developing countries. In Amazonia, from 70 to 170 tonnes (t) of Hg are discharged annually. The extent of biota contamination is also widespread. Mercury must be rendered soluble and then converted into methylmercury in order to accumulate in the food-chain. Generally, it is regarded that Hg must be oxidized to produce significant dissolution. In this work, we examine the stability of mercury as the unoxidized aqueous elemental Hg o (aq.) in aquatic environments. In contact with organic acids, evidence of Hg-organic complex formation has been found from both thermodynamic analysis and electrochemical experiments. Although methylation of these soluble species is not fully understood, formation of such complexes in darkwater rivers must contribute to increased bioavailability.</description><subject>Acid soils</subject><subject>BIOAVAILABILITY</subject><subject>BIODISPONIBILIDAD</subject><subject>BIODISPONIBILITE</subject><subject>CONTAMINANTES INDUSTRIALES</subject><subject>COURS D'EAU</subject><subject>CURSOS DE AGUA</subject><subject>DEVELOPING COUNTRIES</subject><subject>Freshwater</subject><subject>Gold mining</subject><subject>INDUSTRIAL POLLUTANTS</subject><subject>MERCURE</subject><subject>MERCURIO</subject><subject>MERCURY</subject><subject>Mining</subject><subject>PAISES EN DESARROLLO</subject><subject>PAYS EN DEVELOPPEMENT</subject><subject>POLLUANT INDUSTRIEL</subject><subject>POLLUTION DE L'EAU</subject><subject>POLUCION DEL AGUA</subject><subject>RIVERS</subject><subject>Sedimentary soils</subject><subject>Sediments</subject><subject>Soil air</subject><subject>Soil pollution</subject><subject>Soil water</subject><subject>WATER POLLUTION</subject><issn>0044-7447</issn><issn>1654-7209</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNqNkF1LwzAUhoMoOKf_QCFX3hVymrRpLmVMHQwEP65Llp6MzLaZSar031u23evVeeF5eOE9Z2QGZSEymTN1TmaMiSkLIS_JVYw7xljJOZ-R1Stqk9y3SyP1lnYYzBBGaoPv6Na3De1c7_otPUkOI3U9bXT4_NEJA0Xj4xgTdvGaXFjdRrw53Tn5eFy-L56z9cvTavGwzjSHPGUSAWBToBWc8Qo2oBSaslFaotpUyh4wbwTkknMlrZQAWsiGFSyX0hg-J_fH3n3wXwPGVHcuGmxb3aMfYg2yYFIJ9Q8RcqhK9rcohIKqgEm8PYq7mHyo98F1Ooy14CBKxSd8d8RW-1pvg4v123LaVzGAYnr3L9Sgd7U</recordid><startdate>19980301</startdate><enddate>19980301</enddate><creator>Meech, J.A</creator><creator>Veiga, M.M</creator><creator>Tromans, D. 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(British Columbia Univ., Vancouver (Canada))</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reactivity of mercury from gold mining activities in darkwater ecosystems</atitle><jtitle>Ambio</jtitle><date>1998-03-01</date><risdate>1998</risdate><volume>27</volume><issue>2</issue><spage>92</spage><epage>98</epage><pages>92-98</pages><issn>0044-7447</issn><eissn>1654-7209</eissn><abstract>Mercury (Hg) emissions from informal gold mining operations represent a serious environmental problem in developing countries. In Amazonia, from 70 to 170 tonnes (t) of Hg are discharged annually. The extent of biota contamination is also widespread. Mercury must be rendered soluble and then converted into methylmercury in order to accumulate in the food-chain. Generally, it is regarded that Hg must be oxidized to produce significant dissolution. In this work, we examine the stability of mercury as the unoxidized aqueous elemental Hg o (aq.) in aquatic environments. In contact with organic acids, evidence of Hg-organic complex formation has been found from both thermodynamic analysis and electrochemical experiments. Although methylation of these soluble species is not fully understood, formation of such complexes in darkwater rivers must contribute to increased bioavailability.</abstract><pub>Royal Swedish Academy of Sciences</pub><tpages>7</tpages></addata></record> |
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| ispartof | Ambio, 1998-03, Vol.27 (2), p.92-98 |
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| language | eng |
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| source | Jstor Complete Legacy |
| subjects | Acid soils BIOAVAILABILITY BIODISPONIBILIDAD BIODISPONIBILITE CONTAMINANTES INDUSTRIALES COURS D'EAU CURSOS DE AGUA DEVELOPING COUNTRIES Freshwater Gold mining INDUSTRIAL POLLUTANTS MERCURE MERCURIO MERCURY Mining PAISES EN DESARROLLO PAYS EN DEVELOPPEMENT POLLUANT INDUSTRIEL POLLUTION DE L'EAU POLUCION DEL AGUA RIVERS Sedimentary soils Sediments Soil air Soil pollution Soil water WATER POLLUTION |
| title | Reactivity of mercury from gold mining activities in darkwater ecosystems |
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