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Methylation of tracer and ambient mercury ( 200 Hg and  202 Hg, respectively) equilibrated with four different natural organic matter (NOM) isolates was investigated  in vivo  using the Hg-methylating sulfate-reducing bacterium  Desulfobulbus propionicus  1pr3.  Desulfobulbus  cultures grown fermentatively with environmentally representative concentrations of dissolved NOM isolates, Hg[II], and HS −  were assayed for absolute methylmercury (MeHg) concentration and conversion of Hg(II) to MeHg relative to total unfiltered Hg(II). Results showed the  200 Hg tracer was methylated more efficiently in the presence of hydrophobic NOM isolates than in the presence of transphilic NOM, or in the absence of NOM. Different NOM isolates were associated with variable methylation efficiencies for either the  202 Hg tracer or ambient  200 Hg. One hydrophobic NOM, F1 HpoA derived from dissolved organic matter from the Florida Everglades, was equilibrated for different times with Hg tracer, which resulted in different methylation rates. A 5 day equilibration with F1 HpoA resulted in more MeHg production than either the 4 h or 30 day equilibration periods, suggesting a time dependence for NOM-enhanced Hg bioavailability for methylation.

The Effect of Natural Organic Matter on Mercury Methylation by Desulfobulbus propionicus 1pr3