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Titolo:
Mercury speciation in drainage from the New Idria mercury mine, California
Autore:
Ganguli, PM; Mason, RP; Abu-Saba, KE; Anderson, RS; Flegal, AR;
Indirizzi:
Calif Reg Water Qual Control Board, Oakland, CA 94612 USA Calif Reg Water Qual Control Board Oakland CA USA 94612 and, CA 94612 USA Univ Calif Santa Cruz, Dept Environm Toxicol, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 l, Santa Cruz, CA 95064 USA Univ Maryland, Ctr Environm Studies, Solomons, MD 20688 USA Univ MarylandSolomons MD USA 20688 ironm Studies, Solomons, MD 20688 USA Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA Univ CalifSanta Cruz Santa Cruz CA USA 95064 i, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz, Dept Environm Toxicol, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 l, Santa Cruz, CA 95064 USA
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 22, volume: 34, anno: 2000,
pagine: 4773 - 4779
SICI:
0013-936X(20001115)34:22<4773:MSIDFT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATOMIC FLUORESCENCE DETECTION; OPEN OCEAN WATERS; GAS-CHROMATOGRAPHY; EQUATORIAL PACIFIC; VOLATILE MERCURY; METHYL MERCURY; LAKE-MICHIGAN; LEVEL; METHYLMERCURY; SEDIMENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Ganguli, PM Calif Reg Water Qual Control Board, 1515 Clay St,Suite 1400, Oakland, CA 94612 USA Calif Reg Water Qual Control Board 1515 Clay St,Suite 1400 Oakland CA USA 94612
Citazione:
P.M. Ganguli et al., "Mercury speciation in drainage from the New Idria mercury mine, California", ENV SCI TEC, 34(22), 2000, pp. 4773-4779

Abstract

Little is known about the amount and form of mercury released from inoperative mercury mines in the western United States. To address this, we measured mercury concentrations and speciation in water impacted by the New Idriamine. Total unfiltered mercury concentrations (UHgT) in acid mine drainage(AMD) (5.2 to 41 ng/L) were comparable to concentrations upstream from themine (4.2 to 13 ng/L). We measured substantially higher UHgT concentrations (2900 to 12 400 ng/L) in water 1.2 km downstream from the AMD input and estimate that the creek transports a baseline flux of 1.5 kg of Hg/yr from the mine site. We hypothesize that tailings are the primary source of mercury to this creek. We attribute the decrease in UHgT along a downstream transect to Hg(ll) scavenging by iron oxyhydroxide particles that precipitate and settle out of the water. Likewise, dissolved gaseous mercury concentrations decreased with increasing distance from the mine (2.8 ng/L at 1.2 km; 0.56 ng/L at 7.5 km). We regard abiotic atmospheric evasion as the primary mechanism driving this loss. The released mercury is biologically available, evidenced by high (1.1 to 1.7 ng/L) unfiltered monomethylmercury concentrations downstream from the mine. We attribute the relatively uniform downstream monomethylmercury concentrations to a balance between microbial methylation and demethylation.

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Documento generato il 20/10/20 alle ore 05:53:27