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目的建立饮用水中二氯甲烷、苯、甲苯、1,2-二氯乙烷等11种挥发性有机物的顶空-气相色谱法。方法 10 ml样品添加0.30 g NaCl后,在65℃平衡30 min,经顶空进样后,采用Hp-Wax毛细管色谱柱进行分离,以氢火焰离子化检测器进行检测,以保留时间定性,外标法定量。结果二氯甲烷、苯、甲苯、1,2二氯乙烷、乙苯、对二甲苯、间二甲苯、异丙苯、邻二甲苯、氯苯、苯乙烯的线性范围分别为17.4～324、5.5～97、4.1～80、24.5～288、3.6～99、7.2～80、6.2～81、4.1～94、4.2～80、6.4～103和6.2～97μg/L,最低检出浓度为1.1～7.4μg/L,加标回收率为85.8%～107.0%,相对标准偏差(RSD)为1.3%～5.6%(n=6)。结论该分析方法操作简单,基体干扰少,分析效率高,可对饮用水中11种挥发性有机物进行同时监测,便于在各基层单位开展相关的水质监测。
Objective To establish a headspace-gas chromatographic method for the determination of 11 volatile organic compounds in drinking water such as dichloromethane, benzene, toluene and 1,2-dichloroethane. Methods After adding 0.30 g NaCl to 10 ml sample, the solution was equilibrated at 65 ° C for 30 min. After headspace sampling, the samples were separated on a Hp-Wax capillary column and detected by hydrogen flame ionization detector. The retention time was qualitative, Standard method of quantitative. Results The linear ranges of dichloromethane, benzene, toluene, 1,2-dichloroethane, ethylbenzene, p-xylene, m-xylene, cumene, o-xylene, chlorobenzene and styrene were 17.4 ~ 324, 5.5 ~ 97,4.1 ~ 80,24.5 ~ 288,3.6 ~ 99,7.2 ~ 80,6.2 ~ 81,4.1 ~ 94,4.2 ~ 80,6.4 ~ 103 and 6.2 ~ 97μg / L, the minimum detectable concentration was 1.1 ~ 7.4 μg / L, the recoveries were 85.8% -107.0% and the relative standard deviations (RSDs) were 1.3% -5.6% (n = 6). Conclusion The method is simple, less matrix interference and high analysis efficiency. It can monitor 11 kinds of volatile organic compounds in drinking water at the same time and make it convenient to carry out relevant water quality monitoring in each unit.