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RECORD NUMBER: 30 OF 39

OLS Field Name OLS Field Data
Main Title Physical and Chemical Factors That Influence the Anaerobic Degradation of Methyl Parathion in Sediment Systems.
Author Wolfe, N. L. ; Kitchens, B. E. ; Macalady, D. L. ; Grundl, T. J. ;
CORP Author Environmental Research Lab., Athens, GA. ;Colorado School of Mines, Golden. Dept. of Chemistry and Geochemistry.
Year Published 1986
Report Number EPA/600/J-86/301;
Stock Number PB87-175659
Additional Subjects Anaerobic processes ; Degradation ; Sediments ; Pesticides ; Kinetics ; Oxidation reduction reactions ; Reprints ; Methyl parathion ; Phosphorothioate/o-o-(dimethyl)-o-p-(nitrophenyl) ; Aquatic ecosystems
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB87-175659 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 10p
Abstract
The kinetics of disappearance of methyl parathion (0,0-dimethyl-0-p-nitrophenyl phosphorothioate) were studied in anaerobic sediment samples in the laboratory as a function of methyl parathion concentration, pH, and Eh. The disappearance of methyl parathion is described by first-order kinetics and amino methyl parathion (0,0-dimethyl-0-p-aminophenyl phosphorothioate) was identified as a reduction product. In the strongly reducing sediments, the half-lives were on the order of a few minutes. In water isolated from the sediment, no reaction could be detected over the period of a week. Also, there is no apparent correlation between the first-order disappearance rate constants and the pH of the sediment samples. In heat-sterilized sediments, the disappearance rate constants are retarded about two orders of magnitude relative to nonsterile sediments. In chemically treated sediments, first-order disappearance rate constants are comparable to those in the nonsterile system. (Copyright (c) Pergamon Journals Ltd., 1986.)