磷酸氯化铵凝结净化-气相色谱法测定烟草中9种农药残留

Phosphate-ammonium chloride coagulation cleanup-gas chromatographic determination of 9 pesticide residues in tobacco

建立了烟草中两大类9种农药残留气相色谱分析方法。烟叶样品用丙酮提取,经H3PO4-NH4Cl溶液凝结过滤,硅胶柱层析净化,GC-ECD检测。9种农药的平均回收率为83.1%～100.1%,相对标准偏差为4.9%～10%,加标最低检出量为0.01mg/kg,方法的准确度和精密度均符合农药残留测定的技术要求。磷酸氯化铵凝结法适用于本底基质较为复杂的烟草样品的净化,可满足烟叶中多种抑芽剂和拟除虫菊酯类农药残留同时检测的实际需要。

A gas chromatographic method for detecting 9 pesticide residues in tobacco leaves was studied.Pesticide residues were extracted by acetone from the tobacco leaf samples,then purified by phosphate-ammonium chloride coagulation and cleaned up with the silica gel column.Finally the resulting solution was measured by gas chromatography with ECD.The results showed that the average recoveries of nine pesticides ranged from 83.1% to 100.1%,the coefficients of variation were 4.9% to 10%,the minimum detectable conce...