Dynamics Study on Residue and Degradation of 40% Chlorpyrifos in Tomatoe Fruit

The residue dynamics of chlorpyrifos in tomato was studied through gas chromatography analysis.The results showed that recommended dose concentration 75 mL/hm2 of chlorpyrifos,the half-life of chlorpyrifos residue was 2.49 day,and being treated with the high concentration 150 mL/hm2,the half-life of the residue was 2.55 day,After 7 day,the final residue of chlorpyrifos in tomato was 0.200 0 mg/kg,agreed with the safety qualification of chlorpyrifos in tomato in China.