Carb/PSA固相萃取净化-气相色谱质谱法测定茶叶中的34种农药成分

Detemination of 34 Pesiticide Residues in Tea by GC-MS with Carb/PSA Solid-phase Extraction

建立了茶叶中34种农药多残留的气相色谱质谱分析方法。茶叶样品用乙腈一次性提取后，经Carb／PsA固相萃取小柱净化，气相色谱质谱定性定量。添加回收试验的结果表明：34种农药的平均回收率70％124％，相对标准偏差为0．2%-14．9％。方法的检出限为0．1-25．0μg／kg。该方法的灵敏度、准确度和精密度均符合农药残留测定的技术要求。

A multiresidue analytical method was developed for the determination of 34 pesticide residues in tea using gas chromatography-mass spectrometry. The samples were extracted by acetonitrile and cleaned up by Carb/PSA solid phase extraetion（SPE） columns. The results of the spiked level test showed that the average recovery of 34 pesticides ranged from 70% to 124% with relative standard deviations （RSDs） of 0.2%-14.9%. The limits of detection were 0.1-25.0μg/kg. The sensitivity and accuracy meet the requirements of the multiple pesticide residue analysis.