Rapid Determination of 7 Pesticide Residues in Eelsby Using Dispersive Solidphase Extraction and Gas Chromatographytandem Mass Spectrometry

A method was developed for the rapid determination of 7 pesticide multiresiduals such as trifluralin, dicofol, propargite in eels by gas chromatographywith dispersive solidphase extraction.The compounds were extracted from homogenized tissue with acetonitrile.Watersoluble and fatsoluble impurities in acetonitrile was removed by a moderate amount of hexane and deionized water, and acetonitrile purified byAluminaN, C18 and PSA dispersive solid phase extraction mixed power was ready for GCMS analysis.The detectionlimits(S/N=3)were in the range of 0.002-0.01 mg/kg.Tests for recovery were made by addition of mixed standardsof 0.01 mg/kg, and the results were 80.7%-118%，and the relative standard deviations were 3.2%-6.4%. Tests for recovery were made by addition of mixed standardsof 0.02 mg/kg, and the results were 79.8%-114%, and the relative standard deviations were 3.3%-5.9%.