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RECORD NUMBER: 554 OF 767

OLS Field Name OLS Field Data
Main Title Prediction of Substrate Removal Rates of Attached Microorganisms and of Relative Contributions of Attached and Suspended Communities at Field Sites.
Author Lewis, D. L. ; Gattie, D. K. ;
CORP Author Environmental Research Lab., Athens, GA. ;Technology Applications, Inc., Athens, GA.
Year Published 1988
Report Number EPA/600/J-88/034;
Stock Number PB88-224928
Additional Subjects Water pollution ; Aquatic microbiology ; Water flow ; Biodeterioration ; Adsorption ; Mathematical models ; Chlorine organic compounds ; Depth ; Field tests ; Reprints ; Aquatic ecosystems ; Pesticide removal ; D 2-4 herbicide ; Acetic acid/dichlorophenoxy(methyl ester) ; Acetic acid/dichlorophenoxy(butoxyethyl ester) ; Environmental transport
Holdings
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NTIS  PB88-224928 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/29/1988
Collation 9p
Abstract
A mathematical model composed of a direct proportionality relationship between bulk water velocities and field-determined second-order microbial transformation rate coefficients, and the relative rate coefficient of a benchmark chemical, was developed for estimating the substrate removal rates of rapidly degraded chemicals by attached microorganisms in shallow (less than 1 m deep) aquatic ecosystems. Data from 31 field experiments involving the addition of 2,4-dichlorophenoxyacetic acid methyl ester (2,4-DME) in nine field areas were used to determine a field-derived second-order rate coefficient for microbial transformation of the ester. By using 2,4-DME as a benchmark chemical, the model was used to predict microbial transformation rates of the butoxyethyl ester of 2,4-dichlorophenoxyacetic acid (2,4-DBE) at five other field sites. The predicted half-lives of 2,4- DBE varied 1500-fold and were within about a 3-fold range or less of the measured half-lives.