大米中78种农药残留的GC-MS-SIM确证方法研究

Determination Study of 78 Pesticide Residues in Rice By GC-MS-SIM

建立了大米中78种农药残留的检测方法。研究中采用乙酸乙酯提取样品,提取液经凝胶渗透色谱(GPC)净化、浓缩、定容后用气相色谱-质谱联用仪(GC-MS)的选择离子模式进行定性,内标法定量。该方法回收率为63.4%～124.1%,相对标准偏差为4.43%～27.73%,测定低限为0.004～0.050mg/kg。

One testing technology of determining 78 pesticides residues in rice was developed. In this study,the sample was reextracted with acetic ether,and then cleaned by passing through one gel permeation chromatography （GPC） column in sequence. The eluate was condensed to a definite volume,and then determined and confirmed by gas chromatography-mass spectrometry-selected ion model （GC-MS-SIM） with internal standard method. The corresponding recoveries were 63.4% ～ 124.1% and the Relative standard deviations（RSDS） were 4.43% ～ 27.73%, and the limit of determination （LOD） was 0.004 ～0.05mg/kg.