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目的建立利用静态顶空气相色谱-质谱联用法同时检测,生活饮用水中11种常见痕量挥发性卤代烃和苯系物的方法。方法样品中所含的痕量挥发性卤代烃和苯系物经油浴加热后,通过静态顶空进样技术注入气相色谱分离,然后由质谱检测器测定,对升温程序、平衡温度、平衡时间、气液体积比等主要实验条件进行研究和优化。结果在所建立的最佳试验条件下,11种常见卤代烃和苯系物在9 min内可完成测定并具有较好的分离效果;各组分在浓度为0.5μg/L~400μg/L时可获得较好的线性方程,相关系数(r)为0.992 0~0.999 7,检出限为0.05μg/L~0.20μg/L,相对标准偏差(RSD)为3.8%~5.9%,加标回收率为90.4%~104.8%。结论本实验所建立的方法操作简单,分析快速,重现性好,灵敏度高,适用于生活饮用水中常见痕量挥发性卤代烃和苯系物的检测分析。
Objective To establish a method for simultaneous determination of 11 common trace volatile halohydrocarbons and benzenes in drinking water by static headspace gas chromatography-mass spectrometry (GC-MS). Methods The trace volatile halogenated hydrocarbons and benzene compounds contained in the sample were heated in an oil bath and injected into the gas chromatograph by static headspace sampling and then determined by a mass spectrometer. The temperature program, the equilibrium temperature, the equilibrium Time, gas-liquid ratio and other major experimental conditions for research and optimization. Results Under the optimum experimental conditions, 11 kinds of common halohydrocarbons and benzenes could be measured in 9 minutes and had good separation efficiency. The optimum concentration of each component was 0.5μg / L ~ 400μg / L (R) was 0.992 0-0.9997, the detection limit was 0.05μg / L ~ 0.20μg / L, and the relative standard deviation (RSD) was 3.8% -5.9% The recovery rate was 90.4% ~ 104.8%. Conclusion The method established in this experiment is simple, rapid, reproducible and sensitive. It is suitable for the detection and analysis of common trace volatile halogenated hydrocarbons and benzene series in drinking water.