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目的建立吹扫捕集-气相色谱-质谱联用法测定生活饮用水中25种挥发性有机物。方法用气相色谱质谱联用仪测定生活饮用水中氯乙烯、1,1-二氯乙烯、二氯甲烷、反-1,2-二氯乙烯、氯丁二烯、顺-1,2-二氯乙烯、三氯甲烷、四氯化碳、苯、1,2-二氯乙烷、三氯乙烯、环氧氯丙烷、甲苯、四氯乙烯、氯苯、乙苯、对二甲苯、间二甲苯、邻二甲苯、苯乙烯、三溴甲烷、枯烯、1,2-二氯苯、1,4-二氯苯、六氯丁二烯。结果在本实验条件下,25种挥发性有机物的浓度为0.5μg/L~10μg/L时线性范围良好,方法检出限<0.07μg/L,相对标准偏差(RSD)为0.80%~4.17%,水样加标回收率为90.0%~105.0%。结论本法可一次性完成生活饮用水中25种挥发性有机物的分离和测定,方法简便、快速、准确,能充分满足生活饮用水的检测要求。
Objective To establish a method for determination of 25 volatile organic compounds in drinking water by purge and trap - gas chromatography - mass spectrometry. Methods The contents of vinyl chloride, vinylidene chloride, methylene chloride, trans-1,2-dichloroethylene, chloroprene, cis-1,2-bis Chloroethylene, Trichloromethane, Carbon Tetrachloride, Benzene, 1,2-Dichloroethane, Trichlorethylene, Epichlorohydrin, Toluene, Tetrachlorethylene, Chlorobenzene, Ethylbenzene, Paraxylene, Toluene, o-xylene, styrene, tribromomethane, cumene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, hexachlorobutadiene. Results Under the experimental conditions, the linear range of 25 volatile organic compounds was 0.5μg / L ~ 10μg / L with the detection limit of <0.07μg / L and the relative standard deviation (RSD) of 0. 25% ~ 4.17% , Water samples spiked recoveries of 90.0% ~ 105.0%. Conclusion The method can complete the separation and determination of 25 kinds of volatile organic compounds in drinking water at one time. The method is simple, rapid and accurate and can fully meet the testing requirements of drinking water.