气相动态顶空法分析水源水中61种挥发性有机物

Simultaneous Determination of 61 Volatile Organic Compounds in Drinking Source Water by Dynamic Headspace Sampling Method Coupled with Gas Chromatography-Mass Spectrometry

建立了用于饮用水源水中61种挥发性有机物(VOCs)同时进行分析的气相-动态顶空进样-气相色谱-质谱法(D-HS-GC-MS),VOCs包括集中式生活饮用水地表水源地特定项目中的31种VOCs。用D-HS-GC-MS法对水样中VOCs进行分析,获得良好的标准曲线线性关系(均大于0.995,溴二氯甲烷除外),除乙醛、丙烯醛、丙烯腈和环氧氯丙烷的方法检出限分别为15 g/L、13 g/L、11 g/L和11 g/L外,其余VOCs的方法检出限均介于0.10～0.58 g/L,饮用水源水实际样品加标回收率和RSD分别为75.8%～116%和1.16%～21.6%(n=3)。气相-动态顶空进样法相对于常见的吹脱捕集法具有不直接接触样品的优势,避免了仪器被样品污染,用于饮用水源水中几十种VOCs的同时分析,在常规监测中可节省大量的人力物力投入。

A dynamic headspace sampling method combined with gas chromatography and mass spectrometry（D-HS-GC-MS）for simultaneous determination of 61 kinds of volatile organic compounds（VOCs）in drinking source water was evaluated.Under the optimum conditions,detection limit obtained were 0.10-15 g/L,with r0.995（except for bromodicloromethane）.Average values of recovery were 75.8%-116%（n=3）in spike drinking source water samples,with RSD 1.16%-21.6%（n=3）.Compared with purge-and-trap method,the purge needle of dynamic headspace sampling method does not have to touch sample directly,and it is suitable for simultaneous determination of 61 VOCs in drinking source water.