顶空-气相色谱法测定5种挥发性消毒副产物在饮用水加热前后的含量变化
目的 建立顶空气相色谱法测定生活饮用水在加热前后5种挥发性消毒副产物三氯甲烷、四氯化碳、一溴二氯甲烷、二溴一氯甲烷、三溴甲烷含量的变化。方法 取出厂水、末梢水、煮沸的开水、敞口持续煮沸1 min的开水各10 mL于顶空瓶中70 ℃顶空平衡15 min, 取上层气体进样进行气相色谱分析, HP-5毛细管色谱柱分离, 电子捕获检测器检测, 外标法定量。 结果 5种挥发性消毒副产物在不同的浓度下线性关系良好, 相关系数为0.9992~0.9996; 加标回收率为83.3%~101.8%。其中三氯甲烷在4种样品中检出浓度为0.717~44.9 μg/L; 四氯化碳、一溴二氯甲烷、二溴一氯甲烷均有不同程度检出, 三溴甲烷均未检出。结论 经过氯化消毒的自来水煮沸后, 挥发性消毒副产物含量大幅降低, 其中以开盖持续煮沸1 min的开水中含量最低, 因此建议饮用自来水需要提前煮沸。
Objective To establish a method for determination of the changes of five kinds of volatile disinfection by-products such as chloroform, carbon tetrachloride, monobromodichloromethane, dibromochloromethane and tribromomethane in drinking water before and after boiling by headspace gas chromatography. Methods The plant water, the terminal water, the boiled boiling water, and boil exposure for 1 min of boiled water were taken to headspace bottle for air balance for 15 min at 70 ℃, and the upper gas was injected for gas chromatography analysis, separated by HP-5 capillary column, detected by electron capture detector, and quantified by external standard method. Results The 5 kinds of volatile disinfection by-products had good linear relationships at different concentrations, and the correlation coefficients were 0.9992-0.9996. The standard recoveries were 83.3%-101.8%. Among them, the detection concentration of chloroform in the four samples was 0.717-44.9 μg/L, carbon tetrachloride, bromodichloromethane and dibromochloromethane were detected in different degrees, and tribromomethane was not detected. Conclusion After the tap water with chlorination disinfection of boiling, volatile disinfection by-product content greatly reduced, in which the content in the boiling water with open lid for boiling for 1 min is the lowest, so it is recommended that drinking tap water need to be boiled in advance.
标题：顶空-气相色谱法测定5种挥发性消毒副产物在饮用水加热前后的含量变化
英文标题：Determination of 5 kinds of volatile disinfection byproducts in drinking water before and after boiling by headspace-gas chromatography
作者：
杨静 滁州市疾病预防控制中心
刘超 滁州市疾病预防控制中心
郑宏玲 滁州市疾病预防控制中心
中文关键词:饮用水,挥发性消毒副产物,煮沸,顶空气相色谱法,
英文关键词:drinking water,volatile disinfection by-products,boiled,headspace gas chromatography,
发表日期：2018-10-16
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