关键词: 气相色谱-离子阱二级质谱, 茶叶, 噻嗪酮, 亚胺硫磷, 哒螨灵

Abstract: A qualitative and quantitative analysis method was developed for determination of buprofezin, phosmet and pyridaben by gas chromatography – ion trap tandem mass spectrometry in tea samples which were extracted and enriched by solid phase extraction. The samples were extracted by acetonitrile, purified by activated carbon method, concentrated and constant volume to analyze. In this experiment, HP–5MS capillary column was used to separate, inspective mode electron bombardment ion source MS was adopted to detect, and external reference method was employed to quantify. The result indicated that the linear relationship of the method was favorable with R ≥ 0.9970, and the minimum detectability was 0.01~0.02 mg/kg, with the fortified recovery of 3 pesticides ranged from 92.0% to 105.0%, RSD 3.0%～9.3%. The method was simple, high efficiency and sensitivity for the simultaneous determination of buprofezin, phosmet and pyridaben in tea samples.

Key words: gas chromatography–ion trap tandem mass spectrometry, tea, buprofezin, phosmet, pyridaben