Determination of Isoprothiolane Residues in Aquatic Products by Gas Chromatography

The gas chromatographic method was used to determine isoprothiolane residues in rice.The isoprothiolane residue in the test sample was extracted with acetonitrile.After the extracts was evaporated,the residues were cleaned up by solid phase extraction(SPE)with a neutral aluminum oxide cartridge and a florisil cartridge.The residue was determined by GC with ECD-detector,using external standard method.The liner range was 0.002 5～0.250 0 μg·mL-1 for isoprothiolane.The correlation coefficients were 0.9996 for isoprothiolane.The regression equation was y= 57194.11x-71.82.The average recoveries of isoprothiolane in spiked samples ranged from 87.8%～106.7%,and the relative standard deviations were between 4.35%～9.91%.The limit of detection was 0.005 mg·kg-1 in method.