用气相色谱－微波诱导等离子体原子发射光谱（ＧＣＭＩＰＡＥＤ）对土壤中的路易氏剂的测定方法进行了研究。用稀盐酸萃取土壤中的路易氏剂或它的降解产物２－氯乙烯亚胂酸，再与１，３－二巯基丙烷反应生成挥发性环状化合物。用甲苯萃取衍生物，在４８０１９２、１８１３９７、１８９０４２ｎｍ波长处分析检测了衍生物中的氯、硫、砷等元素的发射信号。检测限为１０ｐｇ。路易氏剂的加标回收率在７１２０％～８７８８％之间。 The method of determination of Lewis’ reagent in soil was studied by gas chromatography-microwave-induced plasma atomic emission spectrometry (GCMIPAED). With dilute hydrochloric acid in the soil Rehmannite agent or its degradation products 2-chloroethylene acid, and 1,3-dimercaptopropane reaction of volatile compounds. The derivatives were extracted with toluene, and the emission signals of chlorine, sulfur, arsenic and other elements in the derivatives were analyzed at 480192,181397,189042 nm. The detection limit is 10pg. The regent of lewisite was recovered between 7120% ~ 8788%.