Microbial Mineralization of Ethene Under Sulfate-Reducing Conditions |
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Authors: | Paul M. Bradley Francis H. Chapelle |
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Affiliation: | a U.S. Geological Survey, 720 Gracern Rd Suite 129, Columbia, SC 29210-7651. |
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Abstract: | Previous investigations demonstrated that respiratoly reductive dechlorination of vinyl chloride (VC) can be efficient even at H2 concentrations (≤2 nM) that are characteristic of SO4-reducing conditions. In the study reported here, microorganisms indigenous to a lake-bed sediment completely mineralized [1,2-14C] ethene to 1414CO2 when incubated under SO4-reducing conditions. Together, these observations argue for a novel mechanism for the net anaerobic oxidation of VC to CO2: reductive dechlorination of VC to ethene followed by anaerobic oxidation of ethene to CO2. Moreover, the results of this study suggest that reliance on ethene and/or ethane accumulation as a quantitative indicator of complete reductive dechlorination of chioroethene contaminants may not be warranted. |
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