Suzuki Yusuke, Yoshida Mayumi, Sugano Terumi, Shibata Atsushi, Kodaka Rika, Fujisawa Takuo, Katagi Toshiyuki
Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 4-2-1, Takatsukasa, Takarazuka, Hyogo 665-8555, Japan.
Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 3-1-98 Kasugadenaka, Konohana-ku, Osaka 554-8558, Japan.
J Pestic Sci. 2017 May 20;42(2):17-24. doi: 10.1584/jpestics.D16-085.
The behavior of cyphenothrin () [()-α-cyano-3-phenoxybenzyl (1)---2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropanecarboxylate] in an aquatic environment was investigated by using the C-labeled and isomers. In parallel with the rapid partition from water phase to bottom sediment, was degraded with the first-order half-lives of 2.0 (-) and 7.3 days (-) in the water-sediment system under dark conditions. underwent extensive microbial degradation ester cleavage to form 3-phenoxybenzoic acid, finally forming bound residues and mineralizing to CO. Aqueous photolysis significantly accelerated the degradation of with a half-life of <1 day, mainly photo-induced oxidation at the 2-methylprop-1-enyl group and ester cleavage without isomerization. These results strongly suggest that is unlikely to persist in the actual aquatic environment due to its rapid photolysis and extensive microbial degradation.
使用碳-14标记的氯氰菊酯（）[（）-α-氰基-3-苯氧基苄基（1）---2,2-二甲基-3-（2-甲基丙烯基）环丙烷羧酸酯]的异构体研究了氯氰菊酯在水生环境中的行为。与从水相快速分配到底部沉积物同时，在黑暗条件下的水-沉积物系统中，氯氰菊酯以2.0天（-）和7.3天（-）的一级半衰期降解。氯氰菊酯经历了广泛的微生物降解，酯键断裂形成3-苯氧基苯甲酸，最终形成结合残留物并矿化生成二氧化碳。水相光解显著加速了氯氰菊酯的降解，半衰期<1天，主要是在2-甲基丙烯基处的光诱导氧化和酯键断裂，没有异构体化。这些结果强烈表明，由于其快速光解和广泛的微生物降解，氯氰菊酯不太可能在实际水生环境中持续存在。
