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Enantioselectivity in degradation and transformation of quizalofop-ethyl in soils.
- Source :
-
Chirality . Jul2012, Vol. 24 Issue 7, p552-557. 6p. - Publication Year :
- 2012
-
Abstract
- The enantioselective degradation of quizalofop-ethyl and its metabolite quizalofop-acid in two soils, a Wuhan acidic soil and a Baoding alkaline soil, was investigated. The dissipation of quizalofop-ethyl consisted of two phases, a rapidly deceasing first phase that lasted 1 day and a slowly decreasing second phase that extended till the end of the incubation. It is shown that S-quizalofop-ethyl degraded slightly faster than R-quizalofop-ethyl in the two soils. Further incubation of enantiopure enaniomers showed that quizalofop-ethyl was configurationally stable in soil. Quizalofop-acid was produced quickly, and its amount reached a maximum at 1-6 days time and then decreased slowly with half-lives ranging from 11 to 21 days. The results also showed that quizalofop-acid degraded faster in the acidic Wuhan soil than in the alkaline Baoding soil. At last, significant enantiomerization from S-quizalofop-acid to R-quizalofop-acid was observed, and the enantiomerization was fast, resulting in residues enriched with R-quizalofop-acid whatever racemic quizalofop-ethyl or pure enantiomers were initially applied in the soils. Chirality 24:552-557, 2012. © 2012 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08990042
- Volume :
- 24
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Chirality
- Publication Type :
- Academic Journal
- Accession number :
- 76653640
- Full Text :
- https://doi.org/10.1002/chir.22053