绿茶中13种农药残留的气相色谱质谱测定

Determination of 13 kinds of pesticides residues in green tea by gas chromatography/mass spectrometry

采用气相色谱一质谱法检测绿茶中的多种农药残留。样品经正己烷＋丙酮＋乙酸乙酯（1＋1＋1，V／V／V）提取，活性炭和F10risil层析小柱净化，气相色谱一质谱法检测，结果表明，13种农药均具有良好的线性关系，相关系数不低于0．997，高、中、低3档（0．10、0．50、1．00m/L）加标回收率为85．1％-105．3％，相对标准偏差为5．4％-7．2％，检出限为0．002-0．015m/L0该方法具有检测结果准确可靠、简便快速等优点。

A GC-MS method for determination of 13 pesticide residues in green tea was developed. The pesticides in samples was extracted with n-hexane/acetone/ethyl acetate and cleaned up with supeclean Envi-carb and florisil columns, and then detected by gas chromatography-mass spectrometry. The calibration curves for 13 pesticide residues all had good linear relationships with correlation coefficients not less than 0.997. The spiked recoveries at three concentrations of 0.10, 0.50, 1.00 mg/L were ranged from 85.1% to 105.3% with relative standard deviations of 5.4%-7.2%. The limits of detection were in the range of 0.002-0.015 mg/L. It was an effective method which fit for the pesticide residues analysis and has high accuracy, precision and sensitivity.