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本文研究了用气相色谱法测定大豆籽粒中阔草清的残留量。阔草清用酸性丙酮提取，提取液经正己烷和二氯甲烷净化，残留物用碘甲烷甲基化．形成Ｎ－甲基阔草清衍生物，再于气相色谱仪上测定。本实验采用添加法测定回收率，添加水平为 ５．０～１００．０μｇ／ｋｇ时，其平均回收率为 ８８．７％－９５．３％。本方法最小检出限为 ５．０μｇ／ｋｇ，具有灵敏度高、回收率高以及操作简便等优点。
In this paper, the residual amount of broad grass in soybean grain was determined by gas chromatography. Broad grass extract with acidic acetone extraction, the extract was n-hexane and methylene chloride purification, the residue methylated with methyl iodide. N-methyl broad-leaved derivatives to form, and then measured on a gas chromatograph. In this experiment, the recovery was determined by adding method. The average recoveries were 88.7% -95.3% at the level of 5.0 ~ 100.0μg / kg. The minimum detection limit of this method is 5.0μg / kg, with high sensitivity, high recovery and easy operation.