吹扫捕集-气相色谱/质谱联用法测定水中土臭素和二甲基异莰醇  

Determination of geosmin and 2-methylisoborneol by purge and trap gas chromatography mass spectrometry

作　　者：林麒[1] 吕华东[1] 许冬梅[2] 苑宝玲[3] 

机构地区：[1]福建省疾病预防控制中心,福州350001 [2]福州大学环境与资源学院,福州350108 [3]福州大学土木工程学院,福州350108

出　　处：《中国卫生检验杂志》2010年第11期2763-2765,共3页Chinese Journal of Health Laboratory Technology

摘　　要：目的:优化分析测定条件,建立水中典型臭味物质土臭素(GSM)和二甲基异莰醇(MIB)的吹扫捕集-气相色谱/质谱(PT-GC/MS)方法并应用于实际水样检测。方法:含GSM和MIB的水样过滤后加入氯化钠、吹扫捕集、气相色谱分离、质谱定性与外标法定量;并验证方法的准确度与精密度。结果:两物质在5 ng/L～500 ng/L浓度范围内,方法检出限分别为1.12 ng/L和0.79 ng/L,相关系数r均为0.9999;水库水在20 ng/L、100 ng/L和500 ng/L加标浓度下,回收率83%～118%,RSD1.6%～8.0%。结论:该方法的准确度和精密度均符合要求,满足国标生活饮用水中的GSM和MIB的卫生标准检测要求,且用于实际水样的检测效果良好。Objective：The method for determination of the typical odorous compounds geosmin（GSM） and 2-methylisoborneol（MIB） was established,which was applied to the analysis of environmental water samples.Methods： Samples were purged and trapped,then which were separated and determined by gas chromatography mass spectrometry.Results： The calibration curves were linear in the range of 5 ng/L～500 ng/L,with a correlation coefficient at 0.9999.The limits of detection（LOD） were 1.12 ng/L for GSM and 0.79 ng/L for MIB.Recoveries were 83%～118% and RSD 1.6%～8.0%,and the matrix-spiked water was from a reservior source.Conclusion： This method is accurate,simple and high sensitivity;which fits for the determination of GSM and 2-MIB in the ＂standards for drinking water quality＂ and which was applied to the analysis of environmental water samples successfully.

关 键 词：吹扫捕集 气质联用 土臭素 二甲基异莰醇 

分 类 号：O657.63[理学—分析化学]