Abstract
An enrichment culture that anaerobically degradedm-cresol under sulfate-reducing conditions was obtained from an anoxic aquifer.m-Cresol removal by the culture was greatest when sulfate or thiosulfate served as electron acceptors; sulfite, nitrate, and CO2 were poor substitutes for sulfate. A14C-labeled carboxylated intermediate was detected when the culture was given14C-labeled bicarbonate and nonlabeledm-cresol or nonlabeled bicarbonate and14C-labeledm-cresol. Metabolism of the carboxylated intermediate yielded14C-acetate, which was eventually converted to14CO2. Trace quantities of methylbenzoic acid were also detected as a putativem-cresol intermediate. The importance of this dehydroxylated intermediate in the anaerobic degradation ofm-cresol is unclear, since an amendment of 2-methylbenzoic acid was not degraded by the culture. The stoichiometry of electron acceptor consumption and carbon mass balances confirm thatm-cresol was mineralized by the culture.
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