Abstract: A multiresidue method is described for the determination of 13 pesticides commonly used in leafy-vegetables which customarily used in eastern of China. 5 g of samples are extracted with ethyl acetate, then analyzed by LC-ESI(+)-MS-MS, without further clean-up steps. The obtained correlation coefficient was ranged from 0.9986 to 0.9998. The average recoveries for the pesticides ranged from 82.1 % to 96.3 %, with the relative standard deviations (RSDs) were less than 8.9% for all compounds. The calculated LOQs (μg/kg) were 9.0μg/kg, lower than the maximum residue limits (MRLs) listed in the positive list. The proposed method is easy,fast and sensitive.

Key words: spinach, HPLC-MS-MS, multi-residues, organophosphorus