多壁碳纳米管固相萃取净化-气相色谱质谱联用 同时测定茶叶中26种农药

Determination of 26 pesticides in tea by gas chromatography-mass spectro-metry with multi-walled carbon nanotubes as solid-phase

中文关键词:  多壁碳纳米管  茶叶  农药残留  气相色谱质谱联用法

英文关键词:multi-walled carbon nanotubes  tea  pesticides  gas-chromatography-mass spectrometry

中文摘要:

      目的 建立一种多壁碳纳米管固相萃取净化-气相色谱质谱联用同时测定茶叶中26种农药的检测方法。方法 样品经乙腈提取, 过滤型多壁碳纳米管柱净化后, 使用气相色谱质谱仪检测。结果 碳纳米管净化能够有效去除茶叶中干扰物质, 简化实验步骤, 降低前处理过程中农药的分解。26种农药在0.04~1.6 μg/mL范围内具有较好的线性。方法的检出限为0.005~0.05 mg/kg, 定量下限为0.015~0.15 mg/kg。采用该方法对茶叶样品进行加标回收率实验, 加标回收率在66.6%~125.5%, 相对标准偏差为0.3%~6.4%(n=5)。结论 该方法快速、准确、灵敏, 适合茶叶中多种农药的同时测定。

英文摘要:

      Objective To determine 26 pesticides in tea by solid-phase extraction with multi-walled carbon nanotubes and gas chromatography-mass spectrometry (GC-MS). Methods The sample was extracted with acetonitrile. After purified by multi-walled carbon nanotubes, the sample solution was detected by GC-MS. Results The established method was simple, and could reduce the pesticides decomposition in pretreatment. The calibration curves of 26 pesticides were linear in the range of 0.04~1.6 μg/mL. The limits of detection for 26 pesticides in tea were in the range of 0.005~0.05 mg/kg, and their limits of quantitation were 0.015~0.15 mg/kg. The spiked recoveries of 26 pesticides in tea sample were between 66.6% and 125.5% with relative standard deviations of 0.3%~6.4% (n=5). Conclusion The proposed method is rapid, accurate and sensitive, which is suitable for simultaneous detection of multiple pesticides.