Determination of twelve herbicides in tobacco by a combination of solid-liquid-solid dispersive extraction using multi-walled carbon nanotubes, dispersive liquid-liquid micro-extraction, and detection by GC with triple quadrupole mass spectrometry
文献类型： 外文期刊
作者： Liao, Qie Gen 1 ; Zhou, Yao Min 1 ; Luo, Lin Guang 1 ; Wang, Li Bing 2 ; Feng, Xiao Hu 2 ;
作者机构： 1.Jiangxi Acad Agr Sci, Agr Prod Qual Safety & Stand Inst, Key Lab Qual & Safety Agr Prod, Nanchang 330200, Peoples R China
2.Fuzhou Tobacco Co, Fuzhou 344000, Jiangxi, Peoples R China
关键词： Herbicides;Tobacco;Multi-walled carbon nanotubes;Solid-liquid-solid dispersive extraction;Dispersive liquid-liquid micro-extraction;Gas chromatography-triple quadrupole mass spectrometry
期刊名称：MICROCHIMICA ACTA （ 影响因子：5.833； 五年影响因子：5.357 ）
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收录情况： SCI
摘要： We report on a method for the determination of twelve herbicides using solid-liquid-solid dispersive extraction (SLSDE), followed by dispersive liquid-liquid micro-extraction (DLLME) and quantitation by gas chromatography with triple quadmpole mass spectrometric detection. SLSDE was applied to the extraction of herbicides from tobacco samples using multi-walled carbon nanotubes (MWCNTs) as clean-up adsorbents. The effect of the quantity of MWCNTs on SLSDE, and of type and volume of extraction and disperser solvents and of salt effect on DLLME were optimized. Good linearity is obtained in the 5.0- 500 μg kg~(-1) concentration range, with regression coefficients of >0.99. Intra-day and inter-day repeatability, expressed as relative standard deviations, are between 3 and 9 %. The recoveries in case of herbicide-spiked tobacco at concentration levels of 20.0, 50.0 and 100.0 g kg~(-1) ranged from 79 to 105 %, and LODs are between 1.5 and 6.1 μg kg~(-1). All the tobacco samples were found to contain butralin and pendimeihalin at levels ranging from 15.8 to 500.0 μg kg~(-1).
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