自动顶空气相色谱法测定饮用水中二氯甲烷、1,1-二氯乙烷和1,2-二氯乙烷的研究  

Determination of dichloromthane,1,1-dichloroethane and 1,2-dichloroethane in drinking water by headspace gas chromatography

作　　者：郑三燕[1] 林少美[1] 吴俊[1] 

机构地区：[1]温州市疾病预防控制中心,浙江温州325000

出　　处：《中国卫生检验杂志》2014年第19期2762-2763,2766,共3页Chinese Journal of Health Laboratory Technology

摘　　要：目的探讨生活饮用水中二氯甲烷、1,1-二氯乙烷及1,2-二氯乙烷的顶空气相色谱(HS-GC)测定方法。方法水中的微量二氯甲烷、1,1-二氯乙烷及1,2-二氯乙烷经顶空提取后,用DB-624毛细管色谱柱,采用程序升温方式进行分析,采用ECD作为检测器,以保留时间定性,外标法定量。结果二氯甲烷的线性范围为1.5μg/L^244μg/L;1,1-二氯乙烷的线性范围为5.0μg/L^216μg/L;1,2-二氯乙烷的线性范围为1.7μg/L^414μg/L,二氯甲烷、1,1-二氯乙烷和1,2-二氯乙烷最低检出浓度分别为0.5μg/L、1.7μg/L和0.6μg/L,二氯甲烷回收率范围为95.1%~107%,RSD为3.9%;1,1-二氯乙烷回收率范围为91.3%~111%,RSD为4.9%;1,2-二氯乙烷回收率范围为99.5%~103%,RSD为2.3%。结论该方法具有准确度高、选择性好、检出限低、线性范围宽等特点,满足生活饮用水中二氯甲烷、1,1-二氯乙烷及1,2-二氯乙烷的定量分离测定。Objective To establish a method for determination of dichloromethane,1,1- dichloroethane and 1,2- dichloroethane in drinking water with headspace gas chromatography. Methods Dichloromethane,1,1- dichloroethane and 1,2- dichloroethane in water were extracted by headspace technology,then analyzed with DB- 624 capillary column. Meanwhile,dichloromethane,1,1- dichloroethane and 1,2- dichloroethane were determined with GC by controlling the temperature. Results The linear rang of dichloromethane,1,1- dichloroethane and 1,2- dichloroethane were 1. 5 μg /L - 244 μg /L,5. 0 μg /L -216 μg /L,1. 7 μg /L - 414 μg /L respectively. The determination limit was 0. 5 μg /L,1. 7 μg /L,0. 6 μg /L,and the rate of recovery 96. 4% - 113%,and the RSD was 2. 3% - 4. 9%. Conclusion The method was accurate and selective,low limit of detection,wide liner range. It was suitable for the determination of dichloromethane,1,1- dichloroethane and 1,2- dichloroethane in drinking water.

关 键 词：顶空气相色谱法 电子捕获检测器 二氯甲烷 1 1-二氯乙烷 1 2-二氯乙烷 

分 类 号：O657.71[理学—分析化学]