气相色谱法测定生活饮用水中二氯乙酸和三氯乙酸  

Determination of Dichloroacetic Acid and Trichloroacetic Acid in Drinking Water by Gas Chromatography

作　　者：刘辉 Liu Hui(Sichuan Duowang Environmental Testing Co.,Ltd.,Chengdu Sichuan 610000,China)

机构地区：[1]四川铎旺环境检测有限公司,四川成都610000

出　　处：《山西化工》2024年第10期85-88,共4页Shanxi Chemical Industry

摘　　要：本次检验方法依据《生活饮用水标准检验方法 第10部分:消毒副产物指标》(GB/T 5750.10—2023),建立气相色谱法测定饮用水中二氯乙酸和三氯乙酸。样品采用浓硫酸酸化,1.2-二溴丙烷为内标物质萃取,硫酸-甲醇溶液衍生,然后经SE-30型号毛细管柱分离,电子捕获检测器检测。结果表明:二氯乙酸和三氯乙酸线性范分别在0~200μg/L和0~100μg/L,线性关系良好,相关系数R>0.998,检出限均为0.9μg/L,最低检出质量浓度为2.7μg/L,加标回收率范围依次为在95.7%~104%和97.3%~102%,相对标准偏差为1.2%~2.8%。结论:本次研究饮用水中二氯乙酸和三氯乙酸标准曲线、检出限、精密度和准确度的实验数据均符合标准方法质量要求,但发现该实验方法繁琐,不易操作,衍生时间较长等缺点,实验室可基于此次的初步研究,可继续探讨优化二氯乙酸和三氯乙酸检测条件,具有指导意义。According to The Standard Inspection Methods for Drinking Water Part 10:Disinfection by-product Index(GB/T 5750.10-2023),determination of dichloroacetic acid and trichloroacetic acid in drinking water by gas chromatography method was established.The samples were acidified with concentrated sulfuric acid,extracted with 1,2-dibromopropane as an internal standard substance,derivatized with a sulfuric acid-methanol solution,and then separated by an SE-30 capillary column,with detection by an electron capture detector.The results showed that both dichloroacetic acid and trichloroacetic acid had a good linear relationship within the range of 0~200μg/L and 0~100μg/L,with correlation coefficients R>0.998,whole detection limits of 0.9μg/L,concentration limit of 2.7μg/L,relative standard deviations between 1.2%~2.8%,DCAA and TCAA recovery rates respectively 95.7%~104%and 97.3%~104%.Conclusion:The study of dichloroacetic acid and trichloroacetic acid include:standard curve,detection limit,precision and accuracy of experimental data,whole are meet the standard method quality requirements,but found the experimental method cumbersome,not easy to operate,derivative time long shortcomings,such as laboratory based on this study,can continue to explore the optimization of dichloroacetic acid and trichloroacetic acid detection conditions,which has guiding significance.

关 键 词：饮用水 气相色谱法 二氯乙酸 三氯乙酸 

分 类 号：O657.71[理学—分析化学] R123.1[理学—化学]