样品依次用甲醇水（１＋１）和二氯甲烷－石油醚混合溶剂提取，经石油醚－乙腈分配，硅镁吸附剂净化后，用气相色谱法，电子捕获检测器测定。方法检出限为０．０３ｍｇ／ｋｇ，加标回收范围为８２．１％～９３．２％，相对标准差为６．６％～１０．３％。对市售和施用过阿特拉津除草剂的玉米和甘蔗样品进行了测定，获得了满意的结果。 Samples were sequentially extracted with methanol water (1 + 1) and methylene chloride - petroleum ether, and partitioned by petroleum ether - acetonitrile. The samples were purified with silica - magnesium sorbent and determined by gas chromatography and electron capture detector. The detection limit was 0.03mg / kg. The recoveries ranged from 82.1% to 93.2% with the relative standard deviations of 6.6% -10.3%. The corn and sugar cane samples marketed and applied with atrazine herbicide were tested and satisfactory results were obtained.