液液萃取-气质联用法测定食用植物油中的敌草快含量

摘要

A method for determining the content of diquat in edible vegetable oils was establish.The sam-ples were extracted by deionized water,and reduced by NaBH4.The reduction compounds were extracted by n-hexane and determined by GC-MS.The results showed that in the range of 0.20-1 0 μg/mL, good linearity(Y=266.5 X-3 326.98,r=0.999 7)was obtained using m/z 1 08 as quantification ion. The recoveries for rapeseed oil,soybean oil and corn oil at different additional levels ranged from 90.6%to 93.8% with relative standard deviations(RSDs)of 0.25%-3.01%.This method had the items of simpleness and accuracy,which could be used for determinting diquat in edible vegetable oils.%建立了食用植物油中敌草快含量的液液萃取-气质联用测定方法.样品以水为提取溶剂,用硼氢化钠还原,正己烷萃取还原产物,气相色谱串联质谱法测定.结果表明:采用m/z 108作为定量离子,在0.20~10 μg/mL范围内线性关系良好(Y=266.5 X-3326.98,r=0.9997);在不同添加水平下,菜籽油、大豆油、玉米油的加标回收率在90.6% ~93.8%之间,相对标准偏差为0.25%~3.01%.该方法简便准确,可用于食用植物油中敌草快含量的测定.