饮用水中典型致嗅物质吹扫捕集-气相色谱质谱检测方法及优化

采用吹扫捕集/气相色谱-质谱（GC-MS）法对饮用水中致嗅物质2-甲基异茨醇（2-MIB）和土臭素（GSM）进行测定。通过调整吹扫温度、吹扫时间、吹扫时捕集阱的温度、六通阀温度和传输管线温度，分析吹扫捕集条件对吹扫捕集效率的影响，并确定最佳吹扫捕集条件。2-MIB和GSM的方法检出限（MDL）分别为0.729 ng·L-1和1.037 ng·L-1，方法定量限（MQL）分别为2.187 ng·L-1和3.112 ng·L-1，平均加标回收率分别在92%~108%和88%~104%范围内，相对标准偏差分别小于6.5%和9.0%.在20~300 ng·L-1的范围内，各异嗅化合物浓度与响应值的线性关系均良好，相关系数均大于0.999。该方法具有操作简便、检出限低，相关性良好、灵敏度高、重复性好等优点。

Detection and optimization of typical odorous compounds in drinking water by purge/trap-GC/MS

Purge and trap/gas chromatography-mass spectrometry was used to identify the odorous compounds of 2-methylisoborneol (2-MIB) and geosmin (GSM) in drinking water. By adjusting the sample temperature, purge time, purge temperature, valve oven temperature, and transfer line temperature, the effects of the purge and trap conditions on the efficiency of the purge and trap were analyzed, and the optimum conditions were determined. The method of determining the typical odorous compounds was established in the multireaction monitoring mode (MRM), and the optimum chromatographic parameters were determined. The method detection limits (MDL) of 2-MIB and GSM were 0.729 ng·L-1 and 1.037 ng·L-1, respectively. The method quantitation limits (MQL) of 2-MIB and GSM were 2.187 ng·L-1 and 3.112 ng·L-1, respectively. The average recovery rate ranges of 2-MIB and GSM were from 92% to 108% and 88% to 104%, respectively. The relative standard deviations of 2-MIB and GSM were less than 6.5% and 9.0%, respectively. Under concentrations of 20 to 300 ng·L-1, the relationship between the concentration and the response amplitude was good for each odorous compound, as the correlation coefficients were greater than 0.999.The established method has many advantages such as simple operation, low detection limit, good linear relationship, high sensitivity, and good repeatability.