气相色谱法测定烟草中来福灵和敌杀死残留量

采用乙腈和水混合提取,弗罗里硅土柱净化,以DB-17毛细管柱分离,用气相色谱电子捕获检测器(GC-ECD)测定烟叶中来福灵和敌杀死残留量。来福灵在鲜烟叶和干烟叶中总平均添加回收率分别为90.61%和88.96%,平均变异系数分别为2.90%和3.68%,最低检出浓度为0.0030 mg/kg;敌杀死在鲜烟叶和干烟叶中总平均添加回收率分别为87.58%和86.89%,平均变异系数分别为4.92%和4.28%,最低检出浓度为0.0010mg/kg。

Residue Determination of Exfenvalerate and Deltamethin in Tabacco by Gas Chromatography

Samples were extracted with acetonitrile-water and purified with a Florisil column,followed by separation on the DB-17 capillary column.Pyrethroid pesticide residues in tobacco were then quantitatively determined by GC-ECD.The average recoveries of exfenvalerate were 90.61% and 88.96% respectively in fresh and dry tobacco leaves,whose average coefficients of variation were 2.90% and 3.68%,and the limit of detection was 0.0030 mg/kg.The Average recoveries of deltamethin were 87.58% and 86.89% in Fresh and dry tobacco leaves with the average variation coefficients of 4.92% and 4.28% and the detection limit of 0.0010 mg/kg..