Abstract: A high performance liquid chromatography method was presented for the determination of chlorpyrifos-methyl residues in tomato, hot pepper and egg plant. The chlorpyrifos-methyl residues in the samples were extracted into acetonitrile, cleaned up using a Carb/NH2 solid phase extraction column, separated on a C8 liquid chromatography column, and detected with a diode array detector (DAD). The average spike recoveries of the method across three spike levels were between 80.7% and 92.4% (n ＝6), with a relative standard deviation between 1.1% and 4.6%. The detection limit of the method were 0.02 mg/kg.

Key words: solanaceous vegetables, chlorpyrifos-methyl, residue, high performance liquid chromatography, solid phase extraction