Bioaccumulation and Biodegradation of the (<i>S</i>)-Acid Isomer of Fenvalerate (Sumicidin<sup>®</sup>) in an Aquatic Model Ecosystem

OHKAWA Hideo, KIKUCHI Ryoichi, MIYAMOTO Junshi

doi:10.1584/jpestics.5.11

The degree of bioaccumulation and biodegradation of the (S)-acid isomer of fenvalerate [(RS)-α-cyano-3-phenoxybenzyl-(2S)-2-(4-chlorophenyl) isovalerate], S-fenvalerate, was examined in comparison with DDT. When carp were held in static water containing nominal initial concentration of 0.8ppb of either ¹⁴CN-S-fenvalerate or ¹⁴C-ring-DDT, S-fenvalerate was taken up into fish more slowly as compared with DDT. S-Fenvalerate residues in fish were readily excreted with a half-life of about 5 days during a clearing period, but DDT residues were hardly eliminated from the fish body. In an aquatic model ecosystem, bioaccumulation ratios (BR) for S-fenvalerate ranged from 69 to 117 in fish with three different labeled compounds, and were lower in fish than in snails, daphnids and algae. The BR values for DDT and DDT-R (sum of DDT, DDE and DDD) in fish were about 10 times and 20 times, respectively, larger than that of S-fenvalerate. Metabolism of S-fenvalerate proceeded through hydroxylation at the phenoxy group, hydrolysis of the CN group and cleavage of the ester linkage in four species of aquatic organisms in the ecosystem. It appears that fish is most active in the metabolism of S-fenvalerate among four species. The S-fenvalerate metabolites did not tend to accumulate to high degrees in these aquatic organisms.

Bioaccumulation and Biodegradation of the (<i>S</i>)-Acid Isomer of Fenvalerate (Sumicidin<sup>®</sup>) in an Aquatic Model Ecosystem

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