Record Display for the EPA National Library Catalog


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
Library Call Number Additional Info Location Last
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
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.)