Comparative aerobic soil metabolism of fenvalerate isomers
An aerobic soil metabolism study was conducted to determine the degradation rate of individual isomer of fenvalerate and to assess the potential influence of the RS, SR, and RR isomers to the metabolism of the most insecticidally active SS isomer. Individual (phenoxyphenyl-/sup 14/C)fenvalerate isomers degraded at different rates. The calculated half-lives for the SR, RS, SS, and RR isomers in fenvalerate (racemic mixture) were 155, 89, 108, and 178 days, respectively. The resolved SS isomer degraded at a faster rate with a calculated half-life of 74 days. Racemization of the resolved SS isomer did not occur. A qualitative difference in the chemical nature of soil metabolites between fenvalerate and the resolved SS isomer was not observed. Soil degradation products, phenoxybenzoic acid, 3-(4-hydroxyphenoxy)benzoic acid, and 4'-OH- and CONH/sub 2/-fenvalerate, each accounted for less than 2% of the applied radioactivity. Extensive degradation of these soil metabolites was evident since approximately 50% of the applied radioactivity was recovered as /sup 14/C/sub 2/ and as unextractable bound residues.
- Research Organization:
- E. I. du Pont de Nemours and Co., Wilmington, DE
- OSTI ID:
- 6181595
- Journal Information:
- J. Agric. Food Chem.; (United States), Journal Name: J. Agric. Food Chem.; (United States) Vol. 35; ISSN JAFCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Basic Studies-- Radiometric Techniques-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROBIC DIGESTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIODEGRADATION
CARBON 14
CARBON ISOTOPES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DIGESTION
EVEN-EVEN NUCLEI
INSECTICIDES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLING
LIGHT NUCLEI
MANAGEMENT
NUCLEI
PESTICIDES
PROCESSING
RADIOISOTOPES
SOIL CHEMISTRY
SOILS
TRACER TECHNIQUES
WASTE MANAGEMENT
WASTE PROCESSING
YEARS LIVING RADIOISOTOPES