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RECORD NUMBER: 2 OF 175

OLS Field Name OLS Field Data
Main Title Abiotic Reduction of Nitro Aromatic Pesticides in Anaerobic Laboratory Systems.
Author Tratnyek, P. G. ; Macalady, D. L. ;
CORP Author Colorado School of Mines, Golden. Dept. of Chemistry and Geochemistry.;Environmental Research Lab., Athens, GA.
Publisher c1989
Year Published 1989
Report Number EPA-R-811250; EPA/600/J-89/254;
Stock Number PB90-135534
Additional Subjects Pesticides ; Oxidation reduction reactions ; Anaerobic conditions ; Mitro compounds ; Aromatic compounds ; Electrochemistry ; Thermodynamics ; Reaction kinetics ; Quinones ; pH ; Reprints ; Environmental pollutants ; Methyl parathion
Holdings
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Status
NTIS  PB90-135534 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/10/1990
Collation 9p
Abstract
Rapid abiotic reduction of nitro aromatic pesticides occurs in homogeneous solutions of quinone redox couples, which were selected to model the redox-labile functional groups in natural organic matter. The kinetics of methyl parathion disappearance are first order in methyl parathion and first order in the monophenolate form of the hydroquinone. The concentration of the monophenolate was calculated from electrode measurement of Eh and pH of the model system and the thermodynamic data. The second-order rate constant at 25 C is 31.1 + or - 4.9 L/min/mol in a solution where the quinone-hydroquinone redox system consists of partially reduced indigo disulfonate and is (3.80 + or - 0.65) x 10(4) L/min/mol in redox systems based on anthraquinonedisulfonate. Reduction of methyl parathion is negligible above about -50 mV; this is the apparent reduction potential of methyl parathion under the conditions used in the study. In indigodisulfonate model systems, the disappearance of profluralin is also second order but with a rate constant equal to 79.0 + or - 8.6 L/min/mol. (Copyright (c) 1989 American Chemical Society.)