【摘要】 [目的]评价唐山市生活饮用水中三氯甲烷、一溴二氯甲烷等8种挥发性卤代烃类物质的含量。[方法]采集唐山市自来水公司管网末梢水和高层建筑二次供水管网末梢水水样,采用顶空气相色谱法检测水样中三氯甲烷、一溴二氯甲烷、二溴一氯甲烷、三溴甲烷、三氯乙烯、四氯乙烯、1,1,1-三氯乙烷、1,1,2-三氯乙烷8种挥发性卤代烃类物质的含量,以保留时间进行定性,外标法进行定量分析。[结果]三氯甲烷、一溴二氯甲烷、二溴一氯甲烷和三溴甲烷4种卤代烃的检出率均为100.0%,部分水样检出四氯乙烯和三氯乙烯,所有水样均未检出1,1,1-三氯乙烷和1,1,2-三氯乙烷。除1份市政直供水水样三氯甲烷超出限值外,其余各指标均符合《生活饮用水卫生标准》(GB5749-2006)的要求。4座自来水的管网末梢水中三氯甲烷、一溴二氯甲烷、二溴一氯甲烷和三溴甲烷的含量差异有统计学意义(P﹤0.05)。[结论]唐山市生活饮用水中挥发性卤代烃以三卤甲烷为主,基本符合卫生标准。以地面水、地下水和地面水混合水为水源水的管网末梢水三卤甲烷含量较以地下水为水源的高。更多还原

【Abstract】 [Objective]To evaluate the level of volatile halogenated hydrocarbons in drinking water in Tangshan city.[Methods]The contents of 8 volatile halogenated hydrocarbons in drinking water samples were measured by using headspace gas chromatography.24 water samples of pipe network peripheral water from four water plants and 29 water samples of pipe network peripheral water of secondarily supplied drinking water in Tangshan city were collected.The contents of 8 volatile halogenated hydrocarbons in water samples were evaluated according to Standards for Drinking Water Quality(GB5749-2006).[Results]The 53 water samples all contained chloroform,bromochloromethane,dibromochloromethane and tribromethane.Some of water samples contained tetracarp and trichlorethylene.1,1,1-trichloroethane and 1,1,2-trichloroethane were not detected in all water samples.The concentration of chloroform in one sample was higher than the maximum acceptable level defined by standards for drinking water quality,other 7 volatile halogenated hydrocarbons in 24 water samples were all under the limit of standards for drinking water quality(GB5749-2006).The levels of chloroform,bromochloromethane,dibromochloromethane and tribromethane in the four water plants were different(P﹤0.05).[Conclusion]The trihalomethanes(THMs)were main volatile halogenated hydrocarbons in drinking water in Tangshan city.The levels of THMs in drinking water coming from surface water and mixed surface water and groundwater were higher than that in drinking water coming from groundwater.更多还原