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RECORD NUMBER: 284 OF 848

OLS Field Name OLS Field Data
Main Title Effects of Sediment Sorption and Abiotic Hydrolyses. 1. Organophosphorothioate Esters.
Author Macalady, D. L. ; Wolfe, N. L. ;
CORP Author Environmental Research Lab., Athens, GA.
Year Published 1985
Report Number EPA/600/J-85/029;
Stock Number PB85-193357
Additional Subjects Sediments ; Hydrolysis ; Reaction kinetics ; Insecticides ; Diazinon ; Water pollution ; Sampling ; Sorption ; Soil analysis ; pH ; Water chemistry ; Phosphorus organic compounds ; Esters ; Experimental design ; Desorption ; Reprints ; Dursban ; Ronnel ; Phosphorothioic acid/diethyl-(isopropyl-methyl-pyrimidinyl)-ester ; Phosphorothioates ; Phosphorothioic acid/(diethyl-ester)-(trichloro-pyridyl) ; Phosphorothioic acid/(dimethyl-ester)-(trichlorophenyl-ester)
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NTIS  PB85-193357 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 8p
Abstract The kinetics of hydrolysis of selected organophosphorothioate insecticides were determined in sediment-water samples to define the role of hydrolysis in the sediment-sorbed state. Investigations with well-characterized sediments showed that the rates of neutral hydrolysis of chlorpyrifos (0,0-diethyl 0-(3,5,6-trichloro-2-pyridyl) phosphorothioate), diazinon (0,0-diethyl 0-(2-isopropyl-4-methyl-6-pyrimidyl) phosphorothioate), and Ronnel (0,0-dimethyl 0-(2,4,5-trichlorophenyl) phosphorothioate) are unaltered when the compounds are sorbed to sediments. For chlorpyrifos, the observed rate constants were the same in the sediment and aqueous phases and similar in magnitude to those found for natural water samples. Limited data for diazinon and Ronnel indicated similar kinetic behavior for these related compounds. Alkaline hydrolysis rates in the sediment-sorbed phase for chlorpyrifos, on the other hand, were slowed considerably relative to those in the aqueous phase. Experiments indicated that the rate of alkaline hydrolysis in the sorbed state is approximately 10 times slower than in the bulk solution.
Supplementary Notes Pub. in Jnl. of Agriculture and Food Chemistry 33, n2 p167-173 Mar/Apr 85.
NTIS Title Notes Journal article.
Title Annotations Reprint: Effects of Sediment Sorption and Abiotic Hydrolyses. 1. Organophosphorothioate Esters.
PUB Date Free Form 1985
Category Codes 7D; 68E; 68D; 99F
NTIS Prices PC A02/MF A01
Primary Description 600/01
Document Type NT
Cataloging Source NTIS/MT
Control Number 521418216
Origin NTIS
Type CAT