饮用水中五种消毒副产物顶空-毛细管气相色谱法检测  

Determination of 5 kinds of disinfection by-products( DBPs) in drinking water by headspace-capillary gas chromatography

作　　者：赵鹏[1] 裘立晓[1] 金晓霞[1] 乌杰[1] 

机构地区：[1]宁波市江北区疾病预防控制中心检验科,浙江宁波315020

出　　处：《中国卫生检验杂志》2014年第4期476-478,共3页Chinese Journal of Health Laboratory Technology

基　　金：浙江省医药卫生科技计划(2011RCA032)

摘　　要：目的建立饮用水中五种消毒副产物的快速检测方法。方法利用消毒副产物在水中的弱溶解性,采用顶空-毛细管气相色谱法,对方法的线性范围、线性关系、最低检出限、精密度等各方面的因素进行考察。结果管网水中三氯甲烷检出浓度为4.13μg/L^19.32μg/L,四氯化碳检出浓度为0.31μg/L^0.47μg/L,一氯二溴甲烷检出浓度为1.21μg/L^4.59μg/L。五种消毒副产物在一定浓度范围内线性关系良好,相关系数r均大于0.992,方法检出限均远低于国家标准,相对标准偏差为0.5%~9.4%,平均回收率为84%~101%。结论本方法能够有效分离和准确测定饮用水中五种消毒副产物,在对宁波某地饮用水检测中发现五种消毒副产物均符合国家限值,且以氯代消毒副产物为主,另外一氯二溴甲烷作为溴代消毒副产物的一种,其产生很可能与海水倒灌和盐潮有关。Objective To establish a method for rapid determination of 5 kinds of disinfection by - products （DBPs） in drinking water. Methods Based on the weak water - solubility of DBPs, capillary gas chromatography with headspace sampling was em- ployed to detect the DBPs in drinking water, and the influencing factors including linear range, linear relationship, lowest detec- tion limit, precision and others were all considered. Results The concentrations of trichloromethane, tetrachloromethane and dibromochloromethane in water pipe network were 4.13μg/L - 19.32 μg/L, 0. 31 μg/L-0. 47 μg/L and 1.21 μg/L- 4.59 μg/L, respectively. The curves of 5 kinds of DBPs showed good linear relationship in a certain range. The correlation co- efficients were all greater than 0. 992, the detection limit of the method was far below the national standards, relative standard deviations were 0.5 % - 9.4% （ n = 6）. The average recovery rates were 84% - 101%. Conclusion This method can effec- tively separate and accurately determine 5 kinds of DBPs in drinking water. In addition, the research indicates that the 5 kinds of DBPs conform to the national standards. Chloro - DBPs were dominant in drinking water in this area. Dibromochloromethane may be produced with back flow of sea water or salty tide.

关 键 词：消毒副产物 顶空-毛细管气相色谱法 

分 类 号：O657.71[理学—分析化学]