Behavior of cyphenothrin in aquatic environment.

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.