Determination of Residual Carbendazol,Imidacloprid and Thiophanate Methyl in Fruits and Vegetables by HPLC

A method based on solvent extraction combined with HPLC for the determination of residual carbendazol,imidacloprid and thiophanate methyl in fruits and vegetables was proposed.The residual insecticides in sample were extracted with a mixed solvent of dichloromethane and acetic acid,and separated on an AtlanticsB dC18 column.Gradient elution with a mixed solution of methanol and 0.1 mol·L-1 HCl was performed and the insecticides in the eluate were determined by UV-detection at 267 nm.Recoveries of the method were 84% for carbendazol,83% for imidacloprid and 89% for thiophanate methyl,with relative deviation of 10.68%,6.60%,9.08% respectively.