Survey and Analysis of Pesticide Contamination in Greenhouse

Based on the retention time and characteristics of ion abundance ratio,a pretreatment to organic phosphorus pesticides(tradimefon, dimethoate, dichlorvos, quinalphos, phoxim, buprofezin, thimet, malathion and parathion),pyrethroid pesticides (chlorothalonil, cyperme- thrin, fenvalerate, Decamethrin K-othrin Decis Deltamethrin)combining with Foilosil column chromatograph and gas chromatography(GC) was adopted to detect pesticide residues of cucumbers and leaves in greenhouses of Liaoning.The results showed that the detection of types of organic phosphorus pesticides were not fixed, that was, pyrethroid pesticides that were detected was much stable. Organic phosphorus and pyrethroid pesticides that were detected in the leaves were slightly higher than that in the fruit, and the circumstances of detection at different times and in different greenhouses were slightly different. In view of the current status of pesticides application, we should be more attention to the use and regulation of organic phosphorus and the pyrethroid pesticides. Considering the highly toxic of organic phosphorus pesticide, we should advocate reduce or stop using organic phosphorus pesticides; To the pyrethroid pesticides, we should strengthen its role in the pro- paganda and the use of its control, at the same time, in order to avoid unnecessary pollution, it is necessary to control the dosage of pyrethroid pesticides.