Abstract: Based on the toxicology theory that the organophosphorus pesticide can inhibit AChE and plant-esterase activity,two rapid methods of determining organphosphorus pesticide residues in vegetables by inhibiting AchE or plant-esteraseactivity were established. Results showed that the recoveries of adding standards by the two methods were more than 85%, therelative standard deviations (RSD%) was less than 3% for the latter, and the lowest detection limits ranged from 0.01 to 0.6mg/kg for the both methods. The rapid determining methods can be used for the quantification of organophosphorus pesticideresidues in vegetables, especially by the plant-esterase.

Key words: organophosphorus pesticide residues, rapid determination, inhibiting AChE and plant-esterase activity, vegetable