中文摘要：本文构建了一种应用分散液-液微萃取法和GC-MS技术同时测定芹菜中多种农药残留的方法。试验筛选出最佳的提取条件为: CHCl3萃取剂100 mu L、CAN分散剂900 mu L、萃取时间1.62分；在此条件下，三个加标水平所有农药的平均回收率均在70.8%-93.2%（相对标准偏差小于15%），检测限在2.4-14.2μg/kg之间。
外文摘要：A rapid and sensitive method was established to simultaneously determine multiple pesticide residues in celery through gas chromatography-mass spectrometry (GC-MS). Samples were extracted through a modified quick, easy, cheap, effective, robust, and safe method (modified QuEChERS) and then refined and preconcentrated through dispersive liquid-liquid microextraction (DLLME) by using CHCl3 as extractive solvent and acetonitrile (ACN) as dispersive solvent. The main factors, including type of extraction solvent, volume of extraction solvent, volume of dispersive solvent, extraction time, salt concentration, vortex velocity, and pH of aqueous solution, influencing DLLME were initially evaluated by performing single-factor variable experiments; three significant factors, particularly volume of extraction solvent, volume of dispersive solvent, and extraction time, were thoroughly analyzed through response surface methodology. The following optimized extraction conditions were obtained: 100 mu L of CHCl3, 900 mu L of ACN, and 1.62-min extraction time. The optimized method was validated with average recoveries ranging from 70.8 to 93.2 % (with relative standard deviations of < 15 %) at three spiked levels for all of the pesticides. Good linearity with determination coefficients of > 0.9974 was obtained on the basis of the matrix-matched calibration curve of each pesticide; limits of detection ranging from 2.4 to 14.2 mu g/kg indicated high sensitivity. Malathion with concentrations varying from 0.009 to 0.012 mg/kg was detected in all of the samples; other pesticides were not detected.
外文关键词：Pesticide residue； Celery；GC-MS；QuEChERS；DLLME
作者：Yaru Wang； Xuexue明白 Miao； Haifeng Wei
期刊名称：Food Analytical Methods
期刊影响因子：2.167
出版年份：2016
出版刊次：1
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