固相微萃取-气相色谱-质谱法测定饮用水中土嗅素和2-甲基异茨醇

摘要

采用固相微萃取法富集,气相色谱-质谱联用法定性和定量测定饮用水中致嗅物质土嗅素和2-甲基异茨醇.研究并讨论优化了纤维头的类型、盐的种类和浓度、温度、萃取时间等因素对异味化合物萃取量的影响.土嗅素和2-甲基异茨醇的检出限分别为1.02、2.13 ng/L,相对标准偏差分别为4.96％、7.74％.2种异味化合物在5～1000 ng/L的范围内线性关系良好,相关系数均大于0.985.因此,用该方法能够很好地分析水中痕量的异味化合物.%Determination of musty odorants,geosmin (GSM) and 2-methylisoborneol (2-MIB),in drink water was developed by solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry.The operating conditions of SPME,such as fibre type,salt concentration,water temperature and absorption time were studied and discussed.The limits of detection for geosmin and 2-MIB in water were 1.02,2.13 ng/L,and the relative standard deviations for them were 4.96％,7.74％,respectively.There were good linear correlation (the calibration coefficients were all above 0.985) for the two odorous compounds in the range of 5-1000 ng/L.This method was successfully applied to the analysis trace of the odor compounds in drink water samples.