百草枯(Paraquat,PQ),其20%的溶液国内常用,商品名为克无踪(Gramoxone),合成于本世纪初,1962年开始作为农药及植物生长调节剂用于农业。因其对环境几乎无污染,很快在全世界推广使用。PQ接触土壤可很快分解为无害的化合物且不留残毒,但在使用过程中因操作不当常可造成意外中毒,更 Paraquat (PQ), a 20% solution commonly used in China, is called Gramoxone. It was synthesized at the beginning of this century and used as a pesticide and plant growth regulator for agriculture in 1962. Because of its almost pollution-free environment, it is rapidly being used all over the world. PQ exposure to soil can be quickly decomposed into harmless compounds and does not leave residue, but in the course of improper operation can often result in accidental poisoning, and more