Study on the Determination of Cypermethrin Residues in Vegetable

The paper establish an analysis method for determination Cypermethrin pesticide residue in vegetable. Using acetonitrile to extract cypermethrin in vegetable, and purified by Agilent Florisil column, NH2 column and C18 column solid phase extraction column for the samples, using capillary column gas chromatography as a detection method, GC-ECD to qualitative analyze. The recovery rate of Cypermethrin is 91.2% ∼ 98% after Cleanert Florisil, the coefficient of variation is 0.53% ~ 3.67%, the detection limit is 0.0015 mg • kg -1. The first day, spraying the fenvalerate, dimethoate, chlorothalonil pesticides residues in lettuce was higher than the greenhouse tomato; pesticides (dimethoate, chlorothalonil, fenvalerate) residues in vegetables were higher than those in the open field, pesticide degradation speed is obviously higher than in greenhouse. Subsidence of pesticide is an important factor affecting greenhouse pesticide residues.