农药是当前农业生产用于防治病、虫、杂草对农作物危害不可缺少的物质,对促进农业增产有极重要的作用。随着农业科学技术的发展,化学农药的品种和数量不断增加,已成为防治病虫害的主要手段。农药施用到农作物上以后,绝大部分因多种原因而转化,但作物内会残留有极少量的农药。长时间摄食残留农药会影响人体的健康,这就是农约残留量问题的由来。近年来,在茶叶、粮谷、蔬菜及水果种植中由于不少农户忽视农药的正确、合理使用,农药污染问题经常发生,农药残留量超标相当严重,并逐年加剧。而欧盟、美国、日本、加 Pesticides are indispensable substances for preventing agricultural diseases, insects and weeds from harming crops in agriculture at present. They play an important role in promoting agricultural production. With the development of agricultural science and technology, the varieties and quantities of chemical pesticides have been increasing and have become the main means of pest control. After pesticides are applied to crops, the vast majority of them are converted for a variety of reasons. However, very few pesticides remain in the crops. Prolonged consumption of residual pesticides will affect the health of the human body, which is the origin of the problem of agricultural residues. In recent years, due to many farmers neglecting the correct and rational use of pesticides in the cultivation of tea, grain, vegetables and fruits, pesticide pollution problems frequently occur. Pesticide residues exceed the standard seriously and are increasing year by year. The EU, the United States, Japan, Canada