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OLS Field Name OLS Field Data
Main Title Biological and Abiotic Degradation of Xenobiotic Compounds in Vitro Estaurine Water and Sediment/Water Systems.
Author Walker, W. W. ; Cripe, C. R. ; Pritchard, P. H. ; Bourquin, A. W. ;
CORP Author Battelle Columbus Labs., OH. ;Gulf Coast Research Lab., Ocean Springs, MS. ;Georgia State Univ., Atlanta.;Environmental Research Lab., Gulf Breeze, FL.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/349;
Stock Number PB89-237218
Additional Subjects Pesticides ; Biodeterioration ; Estuaries ; Streams ; Kinetics ; Field tests ; Reprints ; Xenobiotics ; Organochlorine insecticides ; Organophosphorus insecticides ; Environmental persistence
Holdings
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Status
NTIS  PB89-237218 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/18/1989
Collation 18p
Abstract
First-order biotic degradation rate constants of 14 pesticides were determined in estuarine water and sediment/water slurry systems. Test systems used environmentally realistic concentrations of pesticides in sterile and nonsterile samples of water and sediment taken directly from the field. Thiobencarb, sulprofos, chlorothalonil, diclofop-methyl, fenthion, oxyfluorfen, methoxychlor, phorate, and trifluralin all showed significantly (p < = 0.01) more degradation in the presence of nonsterile sediment than in the presence of sterile sediment. Most of these nine pesticides biodegraded significantly faster in flasks containing sediment than in those with water alone. Endosulfan and PCNB, however, biodegraded faster in the absence of sediment. EPN and chlorpyrifos were degraded primarily by abiotic processes. Methomyl did not significantly degrade under any test conditions. Oxyfluorfen and chlorpyrifos were also slow to degrade, with half-lives of generally over two weeks in nonsterile sediment. Diclofop-methyl and phorate were the least persistent, with half-lives of a few days or less.