食品科学 ›› 2011, Vol. 32 ›› Issue (14): 223-226.doi: 10.7506/spkx1002-6630-201114047

• 分析检测 • 上一篇    下一篇

固相萃取-气相色谱法同时检测茶叶中多种农药和多氯联苯残留

吴 林1,2,吴晓波1,张承聪2,马莉莉1,林诗云1,鲁广秋1,唐 娜1,2   

  1. 1.云南省农药检定所 2.云南大学化学科学与工程学院
  • 出版日期:2011-07-25 发布日期:2011-06-18
  • 基金资助:
    云南省农药检定所农药分析研究项目

Multiresidue Determination of Pesticides and Polychlorinated Biphenyls in Tea by Solid-phase Extraction and Gas Chromatography

WU Lin1,2,WU Xiao-bo1,ZHANG Cheng-cong2,MA Li-li1,LIN Shi-yun1,LU Guang-qiu1,TANG Na1,2   

  1. (1. Agrichemical Examination Section of Yunnan, Kunming 650034, China; 2. College of Chemical science and Engineering, Yunnan University, Kunming 650091, China)
  • Online:2011-07-25 Published:2011-06-18

摘要: 建立茶叶中21种有机氯、拟除虫菊酯类农药和多氯联苯(polychlorinated biphenyls,PCBs)残留固相萃取(solid-phase extraction,SPE)-气相色谱分析方法。用正己烷-丙酮(1:1,V/V)提取,经Envi-Carb/NH2复合固相萃取柱净化,采用RTX-5毛细管柱分离,气相色谱-电子捕获检测器(gas chromatography-electron caputure detector,GC-ECD)检测。在0.02、0.05、0.3mg/kg三个添加水平,平均回收率为68.64%~125.62%,相对标准偏差(relative standard deviation,RSD)为1.05%~12.78%,该方法的检测限(detection of limit,LOD)在0.0022~0.0129mg/kg之间,适用于茶叶试样中痕量残留的分析。

关键词: 气相色谱-电子捕获检测器, 茶叶, 农药, 多氯联苯, 固相萃取

Abstract: A solid-phase extraction and gas chromatographic method was established to simultaneously determine 21 organochlorines, pyrethroids and polychlorinated biphenyls (PCBs) in tea. Tea samples were extracted with hexane-acetone (1:1, V/V) in an ultrasonic bath and cleaned up on an Envi-Carb/NH2 SPE column. The analytes were separated on a RTX-5 capillary column and detected in 63Ni-ECD (electron capture detector). The recoveries for the analytes were from 68.64% to 125.62% with a relative standard deviation (RSD) from 1.05% to 12.78% at the spike levels of 0.02, 0.05 mg/kg and 0.3 mg/kg. The limits of detection (LOD) of the method ranged from 0.0022 to 0.0129 mg/kg. In conclusion, this method can be suitable for the determination of organic contaminants in tea samples.

Key words: tea, pesticides, polychlorinated biphenyls (PCBs), solid-phase extraction (SPE), gas chromatography-electron caputure detector (GC-ECD)

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