[Objective] This study aimed to establish a determination method for iprobenfos residue in rice straw and husked rice. [Method] The rice straw and husked rice samples were extracted by acetone-ethyl acetate mixed solvent. The extracts were purified using SPE C18 column and SPE NH2 column, and the iprobenfos residues were determined by GC-FTD. [Result] In the concentration range of 0.005-5.0 mg/kg, iprobenfos concentration showed a good linear relationship with peak area （r=0.999 8）. When the iprobenfos concentrations were 0.01, 0.1 and 1.0 mg/kg respectively, the recoveries of added iprobenfos from rice straw ranged from 72.6% to 99.7% with relative standard deviation ranging from 5.65% to 8.48%; the recoveries of added iprobenfos from husked rice ranged from 81.6% to 97.6% with relative standard deviation ranging from 3.74% to 7.63%. The minimum detectable quantity of iprobenfos was 5×10^-12 g, and the minimum detectable concentrations of iprobenfos in rice straw and husked rice samples were 2.0 and 0.5 μg/kg, respec- tively. [Conclusion] The established determination method is characterized by low de- termination limit, high sensitivity, good reproducibility and high operability, which all meet the requirements by Guideline on Pesticide Residue Trials of the Ministry of Agriculture.
