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Oremland RS, Miller LG, Dowdle P, et al. Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the carson river, nevada. Appl Environ Microbiol. 1995;61(7):2745-53doi: 10.1128/aem.61.7.2745-2753.1995.
Oremland, R. S., Miller, L. G., Dowdle, P., Connell, T., & Barkay, T. (1995). Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the carson river, nevada. Applied and environmental microbiology, 61(7), 2745-53. https://doi.org/10.1128/aem.61.7.2745-2753.1995
Oremland, R S, et al. "Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the carson river, nevada." Applied and environmental microbiology vol. 61,7 (1995): 2745-53. doi: https://doi.org/10.1128/aem.61.7.2745-2753.1995
Oremland RS, Miller LG, Dowdle P, Connell T, Barkay T. Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the carson river, nevada. Appl Environ Microbiol. 1995 Jul;61(7):2745-53. doi: 10.1128/aem.61.7.2745-2753.1995. PMID: 16535081; PMCID: PMC1388499.
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Appl Environ Microbiol. 1995 Jul;61(7):2745-53. doi: 10.1128/aem.61.7.2745-2753.1995.

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

Applied and environmental microbiology

R S Oremland, L G Miller, P Dowdle, T Connell, T Barkay

PMID: 16535081 PMCID: PMC1388499 DOI: 10.1128/aem.61.7.2745-2753.1995

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 Churchill, the most contaminated site, were most active in terms of demethylation potentials. Inhibition of sulfate reduction with molybdate resulted in significantly depressed oxidized/reduced demethylation product ratios, but overall demethylation rates of inhibited and uninhibited samples were comparable. Addition of sulfate to sediment slurries stimulated production of (sup14)CO(inf2) from [(sup14)C]MeHg, while 2-bromoethanesulfonic acid blocked production of (sup14)CH(inf4). These results reveal the importance of sulfate-reducing and methanogenic bacteria in oxidative demethylation of MeHg in anoxic environments.

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