Degradation of [14C]tebupirimphos under anaerobic aquatic conditions
1997
Halarnkar, P.P. | Leimkuehler, W.M. | Green, D.L. | Marlow, V.A.
An anaerobic aquatic metabolism study with [pyrimidinyl-2-14C]tebupirimphos at a concentration of 2 ppm was conducted using a sandy loam flooded with pond water at a constant 22 degrees C. Over the course of the study, extractable residues from water decreased from 56.9% at day 0 to 42.6% of the applied radioactivity at day 127. Extractable residues from soil decreased from 38.3% at day 0 to 30.7% at day 127. Nonextractable residues in water and soil at the end of day 127 were 22.3% and 7.4%, respectively. Volatile residues never exceeded 0.1% of the applied radioactivity during the entire period of incubation. The parent concentration declined from 93.5% at day 0 to 51.1% at day 127. The half-life of tebupirimphos under anaerobic aquatic conditions was calculated to be 194 days. The degradates formed were desisopropyltebupirimphos, desethyltebupirimphos, tertbutylhydroxypyrimidine, and the S-ethyl isomer of isopropyltebupirimphos. Desisopropyltebupirimphos and tert-butylhydroxypyrimidine were the major products (>10%), whereas desethyltebupirimphos and the S-ethyl isomer of isopropyltebupirimphos never exceeded 3% of the applied radioactivity during the entire period of incubation.
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