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INITIAL TEST OF THE BENCHMARK CHEMICAL APPROACH FOR PREDICTING MICROBIAL TRANSFORMATION RATES IN AQUATIC ENVIRONMENTS
Citation:
Newton, T., D. Gattie, AND D. Lewis. INITIAL TEST OF THE BENCHMARK CHEMICAL APPROACH FOR PREDICTING MICROBIAL TRANSFORMATION RATES IN AQUATIC ENVIRONMENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/003 (NTIS PB90219643), 1990.
Description:
Using 2,4-dichlorophenoxyacetic acid methyl ester (2,4-DME) as a benchmark chemical, we determined relative pseudo-first-order rate coefficients for butoxyethyl ester of 2,4-dichlorophenoxyacetic acid (2,4-DBE), methyl parathion, and methyl-3-chlorobenzoate in a diversity of microbial samples, including water, sediment, biofilm, and floating microbial mats collected from a laboratory mesocosm as well as from streams, lakes, and wetlands in Georgia and Florida. he decreasing order of reactivity for relative microbial transformation rates was 2,4-DBE>2,4-DME>methyl-3- chlorobenzene>methyl parathion. alf-lives of the chemicals varied about 60-fold depending on the chemical and microbial sample. elative rate coefficients, however, typically varied only about threefold for field-collected samples. elative rate coefficients determined with samples from a laboratory mesocosm were consistently low compared with the field sample data. verall, the data indicated that microbial transformation rates of a chemical can be satisfactorily inferred for a wide variety of microbial habitats such as water, biofilm, or a sedimenton the basis of its transformation rate relative to that of an appropriate benchmark chemical by using a single type of microbial sample.
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INITIAL TEST OF THE BENCHMARK CHEMICAL APPROACH FOR PREDICTING MICROBIAL TRANSFORMATION RATES IN AQUATIC ENVIRONMENTS