Kim_1998_Pest.Sci_54_237

To elucidate the fate of flupyrazofos [O,O-diethyl O-(1-phenyl-3-trifluoromethyl-5-pyrazoyl)phosphorothionate] in soil, an aerobic soil metabolism study was carried out for 60 days with [14C]flupyrazofos applied at a concentration of 0.38 ug g-1 to a loamy soil. The material balance ranged from 103.5% to 86.9% and the half-life of [14C]flupyrazofos was calculated to be 13.6 days. The metabolites identified during the study were 1-phenyl-3-trifluoromethyl-5-hydroxypyrazole (PTMHP) and O,O-diethyl O-(1-phenyl-3-trifluoromethyl-5-pyrazoyl)phosphate (flupyrazofos oxon), with maximum levels of 9.8% and 1.6% of applied radiocarbon, respectively. Evolved [14C]carbon dioxide accounted for up to 5.3% of applied radiocarbon and no volatile products were detected during the study. Non-extractable 14C-residue reached 31.6% of applied material at 60 days after treatment and radiocarbon was distributed almost evenly in humin, humic acid and fulvic acid fraction.