气相色谱-质谱法测定茶叶中42种残留农药  

Multi-residue determination of 42 pesticides in tea by gas chromatography-mass spectrometry

作　　者：董金斌[1] 王金花[2] 卢晓宇[2] 徐超一[2] 杨俊佼[1] 

机构地区：[1]北京化工大学理学院,北京100029 [2]北京出入境检验检疫局技术中心,北京100026

出　　处：《北京化工大学学报（自然科学版）》2007年第5期472-476,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：粉碎后的茶叶使用乙腈超声提取,再经石墨化碳固相萃取柱净化,采用气相色谱-质谱法（GC-MS）的选择离子监测（SIM）方式和外标法定量方法,同时分析测定了茶叶中的42种农药（12种有机氯、9种拟除虫菊酯、20种有机磷和戊唑醇）残留量.该方法回收率在62.5%～120.1%之间,相对标准偏差小于15.1%,42种农药的检出限最低为0.3μg/kg,最高为9.2μg/kg.该方法快速、灵敏、准确,各项技术指标满足国内外农药残留检测的要求,能够应用于茶叶试样中痕量农药残留的分析.A method for the determination of 42 pesticide （12 organochlorines, 9 pyrethroids, 20 organophosphorus compounds and tebuconazole） residues in tea by gas chromatography-mass spectrometry is described. Pesticides were extracted from tea with acetonitrile in an ultrasonic bath and purified on a graphitised carbon black column, and then determined by gas chromatography with electron ionization mass spectrometric detection in the selected ion monitoring mode. When the contamination level was in the range 0.01 -0.8 mg/kg, the recoveries ranged from 62.5 % to 120.1% with the relative standard deviation from 0.7 % to 15.1% for the different pesticides. The detection limit of the method was estimated to be 0.0003- 06.0092 mg/kg. The method was shown to be linear over the range assayed, 0.004- 20 mg/kg, with determination coefficients 〉0. 992.

关 键 词：气相色谱-质谱法 茶叶 多种残留农药 

分 类 号：O657.7[理学—分析化学]