Record Display for the EPA National Library Catalog


Main Title Initial Test of the Benchmark Chemical Approach for Predicting Microbial Transformation Rates in Aquatic Environments.
Author Newton, T. D. ; Gattie, D. K. ; Lewis, D. L. ;
CORP Author Technology Applications, Inc., Athens, GA.;Environmental Research Lab., Athens, GA.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/003;
Stock Number PB90-219643
Additional Subjects Microorganisms ; Reaction kinetics ; Biodeterioration ; Environmental surveys ; Water pollution ; Chemical compounds ; Field tests ; Experimental design ; Sampling ; Sediments ; Films ; Microbiology ; Reprints ; Benchmarks ; Environmental persistence ; Biochemical reaction kinetics ; Acetic acid/(methyl-ester)-dichlorophenoxy ; Technology utilization ; Floating mats ; Biological effects ; Biological indicators ; Benzoic acid/(methyl-ester)-chloro ; Parathion/methyl ; Acetic acid/(butoxyethyl-ester)-dichlorophenoxy
Library Call Number Additional Info Location Last
NTIS  PB90-219643 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 6p
Using 2,4-dichlorophenoxyacetic acid methyl ester (2,4-DME) as a benchmark chemical, the authors 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. The decreasing order of reactivity for relative microbial transformation rates was 2,4-DBE>2,4-DME>methyl-3-chlorobenzene>methyl parathion. Half-lives of the chemicals varied about 60-fold depending on the chemical and microbial sample. Relative rate coefficients, however, typically varied only about threefold for field-collected samples. Relative rate coefficients determined with samples from a laboratory mesocosm were consistently low compared with the field sample data. Overall, 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 sediment--on the basis of its transformation rate relative to that of an appropriate benchmark chemical by using a single type of microbial sample. (Copyright (c) 1990, American Society for Microbiology.)