Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
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 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/27/1990
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.)