气相色谱法测定烟草中灭多威残留量

 烟草样品中的灭多威残留用乙酸乙酯提取,再经碱解、液液分配净化等步骤除去干扰物质，用极性毛细管柱（DB-FFAP）分离、氮磷检测器（NPD）测定。方法最小检出量（LOD）为0.01ng,最低检出浓度（LOQ）为0.01 mg/kg；添加浓度为0.1～1.0 mg/kg时，平均回收率为88.9%～91.7%，相对标准偏差（RSD）<15%（n=4）。方法准确、灵敏、无杂质干扰，数据准确可靠，可用于烟草中灭多威残留量的检测。

Determination of Methomyl Residue in Tobacco by Gas Chromatography

Methomyl residue in tobacco was extracted by Ethyl acetate and separated by capillary column DB-FFAP，and then determined by NPD detector after interfering material were eliminated by hydrolysis and liquid-liquid distribution purification. The limit of detection （LOD） was 0.01ng，and the limit of quantitation （LOQ） in the samples of tobacco was 0.01mg/kg.The average recovery of the method varied from 88.9% to 91.7% and the relative standard deviation （RSD） was less than 15% （n=4） when the samples were spiked at 0.1～1.0 mg/kg. The results showed that the method was sensitive and precise.