吹扫捕集气相色谱-质谱联用测定水中二甲基异莰醇和土臭素

摘要

该文介绍了吹扫捕集气相色谱—质谱联用测定地表水／饮用水中痕量嗅味物质二甲基异莰醇和土臭素。采用吹扫捕集装置对样品中目标分析物进行富集，再用盐化和红外加热提高吹扫效果[1]；用VF 624 ms的毛细管色谱柱进行分离，质谱检测定量。结果表明线性相关系数均大于0．99，RSD小于10％，加标回收率为90％～110％，最低检出限满足GB 5749—2006中的检测要求[2]。%Determination of 2 methylisoborneol and geosmin in drinking water and surface water by purge and trap capillary column gas chromatography/mass spectrometry was introduced in this paper.Samples of 2 methylisoborneol and geosmin in the water were enriched by purge and trap with Na2 SO4 and infrared heating.The samples were separated by the capillary column VF 624 ms, and detected by mass spectrometry.The results show the linear coefficients of all the calibration curves are more than 0.99 and RSD of all are less than 10%.The recovery rates are 90%~110%.The detection limit meets the requirement of GB 5749—2006.