Residual Determination of Six Insecticides Including Flonicamid in Vegetables by HPLC

A high-performance liquid chromatography(HPLC) method was developed for the determination of flonicamid,chlorantraniliprole,methoxyfenozide,flubendiamide,chlorfenapyr and lufenuron residues in vegetables such as Chinese cabbage,cowpea,cauliflower and tomato.The vegetable samples were extracted with acetonitrile,cleaned up with NH2-SPE columns,and condensed to dry.Determinations of the analytes were completed by HPLC with DAD at 265,254 and 230 nm.The results showed that the fortified recoveries of these six insecticides in vegetable samples were in the range of 88.9%-119.2%,with the relative standard deviations of 0.26%-11.56%.The limit of detection was 1 ng,and the limits of quantification of the six insecticides were 0.05 mg/kg in these vegetable samples.