Research on detection of pesticide residues in food by solid phase extraction-gas chromatography method

Objective: To seek the best examination method for the detection of pesticide residues in food.Methods: Solid phase extraction was used for pretreatment of pesticide residue detection and GC was adopted to determine the 24 kinds of pesticide residues,which were requested by national food contamination monitoring.Results: The mixed standard solution composed by 19 kinds of pesticides was added into samples of vegetables and fruits for accuracy test with 3 levels of 0.005 mg/L~0.05 mg/L,0.05 mg/L~0.5 mg/L and 0.1 mg/L~1.0 mg/L.The spiked recovery of the method was between 70%~104% with the coefficient of variation under 15%.The detection limit was in the range of 0.0001 mg/kg~0.005 mg/kg.Conclusion: Solid phase extraction-gas chromatography is available for the detection of pesticide residues in food with its satisfied accuracy and recovery.