Mercury levels in organisms in proximity to an old chemical site

Santoro, Edward D.; Koepp, Stephen J.

doi:10.1016/0025-326x(86)90604-1

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…In anoxic sediments, mercuric Hg (Hg [II]) can be subsequently converted into the neurotoxic substance methylmercury (MeHg) by anaerobic bacteria (3)(4)(5). Elevated levels of MeHg have been shown to accumulate in fish inhabiting surface waters receiving hydrologic inputs from mercury-contaminated sites (6)(7)(8). Critical to understanding the formation of methylmercury is an accurate knowledge of the chemical reactions that proceed as inorganic mercury moves from contaminant sources to anoxic methylation zones.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Hg(II) to Hg(0) by Magnetite

Wiatrowski

Das

Kukkadapu

et al. 2009

Environ. Sci. Technol.

144

126

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Mercury (Hg) is a highly toxic element, and its contamination of groundwater presents a significant threat to terrestrial ecosystems. Understanding the geochemical processes that mediate mercury transformations in the subsurface is necessary to predict its fate and transport. In this study, we investigated the redox transformation of mercuric Hg (Hg[II]) in the presence of the Fe(II)/Fe(III) mixed valence iron oxide mineral magnetite. Kinetic and spectroscopic experiments were performed to elucidate reaction rates and mechanisms. The experimental data demonstrated that reaction of Hg(II) with magnetite resulted in the loss of Hg(II) and the formation of volatile elemental Hg (Hg[0]). Kinetic experiments showed that Hg(II) reduction occurred within minutes, with reaction rates increasing with increasing magnetite surface area (0.5 to 2 m2/L) and solution pH (4.8 to 6.7), and decreasing with increasing chloride concentration (10(-6) to 10(-2) mol/L). Mössbauer spectroscopic analysis of reacted magnetite samples revealed a decrease in Fe(II) content, corresponding to the oxidation of Fe(II) to Fe(III) in the magnetite structure. X-ray photoelectron spectroscopy detected the presence of Hg(II) on magnetite surfaces, implying that adsorption is involved in the electron transfer process. These results suggest that Hg(II) reaction with solid-phase Fe(II) is a kinetically favorable pathway for Hg(II) reduction in magnetite-hearing environmental systems.

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Section: Introductionmentioning

confidence: 99%

Reduction of Hg(II) to Hg(0) by Magnetite

Wiatrowski

Das

Kukkadapu

et al. 2009

Environ. Sci. Technol.

144

126

View full text Add to dashboard Cite

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“…El procedimiento de conservación y transporte del material biológico, se realizó de acuerdo con lo establecido por United Nations Environmental Programme, UNEP 1984, Castagna et al 1985, Santoro & Koepp 1986y Minganti et al 1990 En el laboratorio, a cada organismo se le extrajo el hepatopáncreas y el músculo pedal, mediante instrumentos de disección de acero inoxidable. Estos tejidos fueron pesados separadamente en una balanza analítica (Sartorius, modelo A-200, precisión de 1x10-4 g.).…”

Section: A1) Materials Biológicounclassified

“…A pesar de que ambos trabajos fueron realizados independientemente y en el mismo período, las diferencias encontradas pueden deberse al hecho de que en el estudio citado se consideró el cuerpo blando total, mientras que en este trabajo los tejidos analizados, particularmente el hepatopáncreas, corresponde a aquellos cuya capacidad para bioacumular metales pesados, tales como el Hg, es conocida (Santoro & Koepp 1986, Riisgard & Hansen, 1990.…”

Section: Estación -Campañaunclassified

“…Estos resultados están de acuerdo con numerosos estudios similares a este, en los que igualmente se concluye que las diferencias en la concentración de Hg total en el ambiente acuático, depende de la proximidad o lejanía con que se ubican las estaciones de muestreo, respecto de la posición de la(s) fuente(s) que abastecen el elemento (Campbell et al 1986, Santoro & Koepp 1986, Shaw et al 1988y González 1991.…”

Section: Concentration Of Totalunclassified

“…Los resultados obtenidos en este estudio están de acuerdo con trabajos similares, los cuales igualmente concluyen que el Hg eliminado en zonas próximas a puntos de descarga de efluentes industriales, tiene como principal destino el material sólido suspendido en la columna de agua (Campbell et al1986, Santoro & Koepp 1986, Riisgard & Hansen 1990, Grosheva 1993y Díaz et al 1995.…”

Section: Tablaunclassified

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