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目的建立饮用水中14种卤代烃的顶空气相色谱(HS-GC)测定方法。方法水中微量卤代烃经顶空提取(平衡时间为45min,平衡温度为70℃)后,应用HP-5毛细管色谱柱(60m*0.32mm*0.25μm),采用程序升温方式进行GC(ECD)分析,以保留时间定性,外标法定量。结果 1,1-二氯乙烯、二氯甲烷、反1,2-二氯乙烯、顺1,2-二氯乙烯、三氯甲烷、1,1,1-三氯乙烷、四氯化碳、1,2-二氯乙烷、三氯乙烯、二氯一溴甲烷、一氯二溴甲烷、氯乙烯、四氯乙烯、三溴甲烷检出限为0.01μg/L～3.15μg/L,该方法的平均回收率为92%～110.6%,RSD为2.7%～6.0%。结论该方法操作简便、快速、灵敏,适用于饮用水中14种卤代烃的同时测定,能够满足国标中饮用水的有机物指标要求。
Objective To establish a method for the determination of 14 halogenated hydrocarbons in drinking water by headspace gas chromatography (HS-GC). Methods The GC (ECD) method was applied to the determination of trace amount of halohydrocarbons in water by headspace extraction (equilibration time: 45 min, equilibrium temperature: 70 ℃) using HP-5 capillary column (60m × 0.32mm × 0.25μm) Analysis, to retain the time qualitative, external standard method of quantitative. Results Vinylidene chloride, methylene chloride, trans 1,2-dichloroethylene, cis 1,2-dichloroethylene, trichloromethane, 1,1,1-trichloroethane, carbon tetrachloride , The detection limits of 1,2-dichloroethane, trichlorethylene, dichlorobromomethane, chlorodibromomethane, vinyl chloride, tetrachlorethylene and tribromomethane are 0.01μg / L ~ 3.15μg / L, The average recovery was 92% ~ 110.6%, RSD was 2.7% ~ 6.0%. Conclusion The method is simple, rapid and sensitive. It is suitable for the simultaneous determination of 14 kinds of halogenated hydrocarbons in drinking water and can meet the organic index requirements of drinking water in GB.