Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the carson river, nevada.

Applied and Environmental Microbiology
R S OremlandT Barkay

Abstract

Sediments from mercury-contaminated and uncontaminated reaches of the Carson River, Nevada, were assayed for sulfate reduction, methanogenesis, denitrification, and monomethylmercury (MeHg) degradation. Demethylation of [(sup14)C]MeHg was detected at all sites as indicated by the formation of (sup14)CO(inf2) and (sup14)CH(inf4). Oxidative demethylation was indicated by the formation of (sup14)CO(inf2) and was present at significant levels in all samples. Oxidized/reduced demethylation product ratios (i.e., (sup14)CO(inf2)/(sup14)CH(inf4) ratios) generally ranged from 4.0 in surface layers to as low as 0.5 at depth. Production of (sup14)CO(inf2) was most pronounced at sediment surfaces which were zones of active denitrification and sulfate reduction but was also significant within zones of methanogenesis. In a core taken from an uncontaminated site having a high proportion of oxidized, coarse-grain sediments, sulfate reduction and methanogenic activity levels were very low and (sup14)CO(inf2) accounted for 98% of the product formed from [(sup14)C]MeHg. There was no apparent relationship between the degree of mercury contamination of the sediments and the occurrence of oxidative demethylation. However, sediments from Fort Churchi...Continue Reading

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Citations

Aug 31, 2004·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·R D DeLauneW H Patrick
Jul 24, 2012·Environmental Science and Pollution Research International·S BouchetD Amouroux
Jun 6, 2017·Science Advances·Xia LuBaohua Gu
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Jan 4, 2019·Bulletin of Environmental Contamination and Toxicology·Hongxia DuDingyong Wang
May 10, 2020·The Science of the Total Environment·Prakriti Sharma GhimireShichang Kang
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Jul 29, 2006·Chemosphere·Agneta Göthberg, Maria Greger
Feb 16, 2007·Chemical Reviews·William F FitzgeraldChad R Hammerschmidt

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