Determination of Pesticide Residues in Vegetables by Solid Phase Extraction and Gas Chromatography

Objective To establish a method for the determination of pesticide residues in vegetables by solid phase extraction and gas chromatography.Methods The samples were ground,soaked,and extracted by solid phase,organophosphorus pesticide residues were determined by GC with FPD detector and organochlorine and pyrethroid pesticides compounds by GC with ECD detector.Results The linearity range and coefficients of correlation were 0.125-6.25 g/ml and 0.999 1-0.999 8 for organophosphorus respectively,and 0.005-1.0 g/ml and 0.999 3-0.999 6 for organochlorine,and 0.010-2.0 g/ml and 0.998 90.999 8 for pyrethroid.The relative standard deviation varied between 0.82% to 2.5%,and recovery rate ranged from 88.5% to 110.0%.No significant difference was found between this method and national standard method.Conclusion The method has the advantages of easy and quick operation,more disturbances being eliminated and higher accuracy and precision.