气相色谱法测定阔草清在大豆籽粒中的残留量

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，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。

Study on the Residual Analysis of Flumetsulam in Soybean Crain

the residual analysis method of flumetsulam in soybean grain was discussed in this paper.The flumetsulam are extracted from soybean grain by actone/0.1Nhydrochloric acid (9:1)and purified by liquid partition in different pH Direct determination of flumestsulam by gas chromatography (GC)has not been possible because of its thermal instability and low volatlity.The flumestsulam was derivatized with methyl iodide to from the N - methyl derivative.The derivatized flumetsulan is thermally stable for GC analysis.On the level of 5.0-100ug/kg,the average recovery of derivatized flumetsulam in soybean grain were 88.7%-95.3%.The minimum dtecable concentration of flumetsulam is ther mally stable for GC analysis.On the level of 5.0-100.0ug/kg,The minimun detecable concentration of flumetsulam in the sammples of soybean grain was 5.0ug/kg.