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目的建立饮用水中二氯甲烷、1,1￣二氯乙烯、反式及顺式1,2￣二氯乙烯、1,2￣二氯乙烷的顶空大口径毛细管气相色谱测定法。方法水中的微量卤代烃经顶空提取后,用DB-624大口径毛细管色谱柱,采用程序升温方式进行气相色谱分析,以保留时间定性,外标法定量。结果二氯甲烷、1,1￣二氯乙烯、反式1,2￣二氯乙烯、顺式1,2￣二氯乙烯、1,2￣二氯乙烷的线性范围分别为0.85～168、0.07～12.1、0.40～77.8、0.53～119、1.2～265μg/L,均呈较好的线性关系,检出限分别为0.83、0.07、0.40、0.53、1.10μg/L,均r≥0.999 5。该方法的回收率为102.5%～113.8%,RSD为5.5%～11.8%。结论该方法适用于同时测定饮用水中5种卤代烃的含量,操作简便、灵敏度高。
OBJECTIVE To establish a capillary gas chromatographic method for determination of large-area headspaces in drinking water by dichloromethane, 1,1,1-dichloroethylene, 1,2-dichloroethane and 1,2-dichloroethane. Methods The trace amounts of halogenated hydrocarbons in water were extracted by headspace and analyzed by gas chromatography with DB-624 large-bore capillary column with programmed temperature-rising method. The retention time was qualitative and the external standard method was used for quantification. Results The linear range of methylene chloride, 1,1-dichloroethylene, trans-1,2-dichloroethylene, cis-1,2-dichloroethylene and 1,2-dichloroethane was 0.85-168, 0.07 ~ 12.1,0.40 ~ 77.8,0.53 ~ 119,1.2 ~ 265μg / L, all showed a good linear relationship with the detection limits of 0.83,0.07,0.40,0.53,1.10μg / L, all r≥0.9995. The recoveries of this method ranged from 102.5% to 113.8% with a RSD of 5.5% to 11.8%. Conclusion The method is suitable for the simultaneous determination of five kinds of halogenated hydrocarbons in drinking water content, easy to operate and high sensitivity.