Mercury methylation by Desulfovibrio desulfuricans ND132 in the presence of polysulfides

Jenny Ayla Jay, Karen J. Murray, Cynthia C. Gilmour, Robert P. Mason, Francois M. M. Morel, A. Lynn Roberts, Harold F. Hemond

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

The extracellular speciation of mercury may control bacterial uptake and methylation. Mercury-polysulfide complexes have recently been shown to be prevalent in sulfidic waters containing zero-valent sulfur. Despite substantial increases in total dissolved mercury concentration, methylation rates in cultures of Desulfovibrio desulfuricans ND132 equilibrated with cinnabar did not increase in the presence of polysulfides, as expected due to the large size and charged nature of most of the complexes. In natural waters not at saturation with cinnabar, mercury-polysulfide complexes would be expected to shift the speciation of mercury from HgS0(aq) toward charged complexes, thereby decreasing methylation rates.

Original languageEnglish (US)
Pages (from-to)5741-5745
Number of pages5
JournalApplied and Environmental Microbiology
Volume68
Issue number11
DOIs
StatePublished - Nov 1 2002

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Food Science
  • Applied Microbiology and Biotechnology
  • Ecology

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