建立了在线净化-液相色谱-串联质谱测定茶叶中吡虫啉、啶虫脒、噻虫啉、噻虫嗪和噻虫胺5种常见烟碱类农药残留量的方法。样品经水浸泡、乙腈提取和在线净化后，用液相色谱-串联质谱测定。结果表明，本方法对5种烟碱类农药的定量限均为0.01 mg／kg。5种烟碱类农药在1.0～10μg／L范围内具有良好的线性关系，相关系数均大于0.998。在0.01、0.02和0.05 mg／kg的添加水平下，回收率为68.0％～113.2％，相对标准偏差为3.2％～7.6％。本方法简便、快速、准确，适用于茶叶样品中烟碱类农药残留量的检测。
An online clean-up-liquid chromatography-tandem mass spectrometry method was developed for the determination of five neonicotinoid pesticides( imidacloprid,acetamiprid, thiamethoxam,thiacloprid and clothianidin)in tea. After rehydrated,extracted with acetoni-trile,and cleaned-up online,the tea samples were determined by liquid chromatography-tan-dem mass spectrometry. The results indicated that the limits of quantification for the five neoni-cotinoid pesticides were 0. 01 mg/kg,and the calibration curves were linear in the range of 1. 0-10 μg/L. The spiked recoveries for the five neonicotinoid pesticides from tea were in the range of 68. 0%-113. 2% with the relative standard deviations between 3. 2% and 7. 6%. This method is simple,rapid,accurate,and suitable for the simultaneous determination of the five neonicotin-oid pesticides in tea.
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