DETERMINATION OF MULTI-RESIDUES OF PYRETHROID IN FRUITS AND VEGETABLES BY GAS CHROMATOGRAPHY

To establish a method of determining 4 pyrethroid pesticide residues in fruits and vegetables rapidly and accurately.The pesticide residues were extracted by microwave preparation systems,purified by a florisil SPE column,and then determined by capillary gas chromatography-μECD.The method can simultaneously determine 4 pyrethroid pesticides residues,with the detection limits of 0.001μg/mL,the liner range of 0.001～5μg/mL by fenpropathrin and 0.001～10μg/mL by the other three.The coefficients of correlation were more than 0.9990.The recoveries of four pesticides were between 76.2 %～105.9 %,and the relative standard deviations were 3.4%～12.0%.This method was preponderant in sensitivity,time-saving and purification.