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

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5~1 000 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 Geosmin and 2-Methylisoborneol in Drinking Water by Solid-Phase Microextraction-Gas Chromatography-Mass Spectrometry

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 5-1 000 ng/ L. This method was successfully applied to the analysis trace of the odor compounds in drink water samples.