Reduction of selenate to selenide by sulfate-respiring bacteria: experiments with cell suspensions and estuarine sediments.

摘要: Abstract Washed cell suspensions of Desulfovibrio desulfuricans subsp. aestuarii were capable reducing nanomolar levels selenate to selenide as well sulfate sulfide. Reduction these species was inhibited by 1 mM or tungstate. The addition decreased the reduction and enhanced sulfate. Increasing concentrations rates but rates. Cell kept in incapable either when selenate/sulfate ratio ≥0.02, indicating that irreversible inhibition occurs at high concentrations. Anoxic estuarine sediments having an active flora sulfate-respiring bacteria a small amount ambient low (<4 mM). These results indicate is inhibitor trace quantities selenate. Therefore, direct traces natural environments constrained concentration ions. significance this observation with regard role play sequestering selenium discussed.