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Aerobic soil metabolism of flupyrazofos

✍ Scribed by Kim, Jeong-Han; Kang, Kyong-Goo; Park, Chang-Kyu; Kim, Kyun; Kang, Boo-Hyon; Lee, Sung-Kyu; Roh, Jung-Koo

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
248 KB
Volume
54
Category
Article
ISSN
1526-498X

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✦ Synopsis

To elucidate the fate of Ñupyrazofos [O,O-diethyl O-(1-phenyl-3-triÑuoromethyl-5-pyrazoyl)phosphorothionate] in soil, an aerobic soil metabolism study was carried out for 60 days with [14C]Ñupyrazofos applied at a concentration of 0É38 lg g~1 to a loamy soil. The material balance ranged from 103É5% to 86É9% and the half-life of [14C]Ñupyrazofos was calculated to be 13É6 days. The metabolites identiÐed during the study were 1-phenyl-3-triÑuoromethyl-5-hydroxypyrazole (PTMHP) and O,O-diethyl O-(1-phenyl-3-triÑuoromethyl-5-pyrazoyl)phosphate (Ñupyrazofos oxon), with maximum levels of 9É8% and 1É6% of applied radiocarbon, respectively. Evolved [14C]carbon dioxide accounted for up to 5É3% of applied radiocarbon and no volatile products were detected during the study. Non-extractable 14C-residue reached 31É6% of applied material at 60 days after treatment and radiocarbon was distributed almost evenly in humin, humic acid and fulvic acid fraction.

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