Multi-residue Determination of Forty-one Pesticides in Vegetable by Gas Chromatography-IonTrap Mass Spectrometry Using Selective Ion Technique

A method was described for determining forty-one pesticide residues in vegetable,including organophosphorus,organochlorine,carbamate,and synthetic pyrethroid pesticides.These pesticides were extracted from samples with acetone and dichloromethane,and co-extractives were removed by a charcol/celite/alumium column.Analysis was performed by gas chromatography coupled with ion trap mass spectrometry in selective ion storage(SIS) mode.Retention time and specific ions were used to identify the pesticides.Recoveries for 41 pesticides were obtained from cabbage,cucumber and green pepper(blank samples spiked at 0.1,0.5,1.0 mg/kg levels) ranging from 70% to 110%,the coefficient of variation of the method was less than 20% for every case.Limits of detection were ranging from 0.02 mg/ L to 0.1 mg/ L,depending on the compound.