Microbial potential for the anaerobic degradation of simple aromatic compounds in sediments of the Milwaukee Harbor, Green Bay and Lake Erie
- Medical Coll. of Wisconsin, Milwaukee, WI (United States). Dept. of Pharmacology and Toxicology
The ability of microbial populations to mediate the anaerobic transformation of six aromatic compounds in sediments from the Milwaukee Harbor, Green Bay, and Lake Erie was examined. Sediment slurries were incubated in an anaerobic mineral salts medium that was amended with multiple electron acceptors, including manganese(IV) and Fe(III) oxides, and the concentrations of the aromatic substrates were followed over a six- to 18-month period. Most sediment samples showed a complete loss of benzoate and 4-hydroxybenzoate within approximately two months. Benzoate losses were partially to markedly inhibited by the addition of molybdate, whereas losses of 4-hydroxybenzoate were not molybdate-inhibited. Significant losses of aniline, 3-chlorobenzoate, and 2,4-dichlorophenoxyacetic acid were observed with many of the sediments after approximately 18 months. Molybdate markedly inhibited the metabolism of 3-chlorobenzoate with all sediments, and of aniline with some sediments. Increases in free chloride, which are indicative of reductive dechlorination, were coincident with losses of 3-chlorobenzoate and 2,4-dichlorophenoxyacetic acid. No significant metabolism of 4-chlorobenzoate was apparent in any of the sediments. Overall, the results indicate that microbes with the ability to degrade at least certain aromatic compounds are present at various sites within these environments.
- OSTI ID:
- 5107193
- Journal Information:
- Environmental Toxicology and Chemistry; (United States), Vol. 13:3; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
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