黄瓜中噻嗪酮、三唑酮残留量的测定

Determination of Buprofezin and Triadimefon Residues in Cucumbers by GC-MS

利用气相色谱-质谱(GC-MS),电子轰击(EI)法同时测定了黄瓜中噻嗪酮、三唑酮残留量。试样经丙酮-石油醚提取,二氯甲烷萃取,无水硫酸钠干燥,浓缩。选择灵敏度高、干扰少的检测离子,用选择离子监测(SIM)方式测定了其中两种农药残留。噻嗪酮,三唑酮的检出限量分别为0.13和0.013mg/kg,标准添加(0.013～1mg/kg)的回收率为71.1%～123%,测定的相对标准偏差(RSD)为3.4%～17%。

Buprofezin and triadimefon residues in cucumbers were determined by gas chromatography-mass spectrometry (GC- MS) with electron impact (EI) ionization. The samples were treated by extraction solvent aceton and petroleum ether, then dichloromethane.The organic phase was separated from water by adding NaCl. No clean up step was required. Buprofezin and triadimefon were analyzed by GC-MS with selected-ion monitoring (SIM). Detection limits of 2 pesticides were 0.13 and 0.013 mg/ kg. The recoveries of 2 pesticides ranged from 71.7% ～ 123%. The relative standard deviation was 6.5%～17%.