Residues dynamics of fipronil in 5.0% Regent SC paddy

Residues dynamics and terminal residue of fipronil in paddy and field environment were studied by GC.The results showed that the recoveries of fipronil in straw,soil,water,rice and bran samples ranged from 82.15%~97.45%.The half-life of degradation for fipronil was 4.61~4.91 d in straw,14.87~15.42 d in soil,3.84~3.98 d in water respectively.The terminal residues in rice and bran were 0.041 mg/kg,0.053 mg/kg respectively,less than the lowest determination limits.