气相色谱-质谱联用仪测定玉米子粒中2,4-D异辛酯的残留

摘要

A Gas Chromatography-Mass Spectrometry method (GC-MS) was established for determining 2, 4-D-ethylhexyl residues in com. The samples were extracted by acetone, extracted with chloroform, purified by glass column chromatography with Florisil and concentrated and then determined by GC-MS. The results showed that the average recoveries were 88.7%-101.7% for corn. The coefficient of variation was 7.6%-9.0% . The minimum detectable level was 2.0×10-11 g and the lowest detectable concentration was 4.0×10-3 mg/kg. The convenient method can satisfy the requirement of residual analysis and provide reference for other crops.%为检测玉米子粒中2,4-D异辛酯残留量,样品用丙酮提取后,三氯甲烷萃取,经弗罗里硅土层析柱净化,用气相色谱质谱联用仪测定.结果表明:玉米子粒中2,4-D异辛酯添加平均回收率为88.7％～101.7％,变异系数为7.6％～9.0％,2,4-D异辛酯的最小检出量为2.0×10-11 g,玉米子粒中最低检出浓度为4.0×10-3mg/kg.