Environmental behavior of benalaxyl and furalaxyl enantiomers in agricultural soils.

Autor: Qin, Fang1,2 (AUTHOR), Gao, Yong X.1 (AUTHOR), Guo, Bao Y.1 (AUTHOR), Xu, Peng1 (AUTHOR), Li, Jian Z.1 (AUTHOR), Wang, Hui L.1 (AUTHOR) huiliwang@rcees.ac.cn
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Zdroj: Journal of Environmental Science & Health. Part B. Pesticides, Food Contaminants & Agricultural Wastes. Oct2014, Vol. 49 Issue 10, p738-746. 9p.
Abstrakt: The enantioselective environmental behavior of the chiral fungicides benalaxy and furalaxyl in agricultural soils in China was studied. Although sorption onto soils was non-enantioselective, the leaching of benalaxy and furalaxyl was enantioselective in soil columns. The concentrations of theS-enantiomers of both fungicides in the leachates were higher than theR-enantiomers. This can be attributed to enantioselective degradation of the two fungicides in the soil column. Enantioselective degradation of the two fungicides was verified by soil dissipation experiments, and theR-enantiomers degraded faster than theS-enantiomers in partial soils. The half-life was 27.7–57.8 days forS-benalaxyl, 20.4–53.3 days forR-benalaxyl, 19.3–49.5 days forS-furalaxyl and 11.4–34.7 days forR-furalaxyl. The degradation process of the two fungicide enantiomers followed the first-order kinetics (R2> 0.96). Compared to furalaxyl, benalaxyl degraded more slowly and degradation was less enantioselective. These results are attributed to the influence of soil physicochemical properties, soil microorganisms, and environmental factors. [ABSTRACT FROM PUBLISHER]
Databáze: GreenFILE
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