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中国无机分析化学:2023,13(11):1171-1175
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全自动电位滴定法测定水中氯化物
周? 弛1, 郭晋君1, 刘建利1, 张秦铭1, 王? 斐1, 吕? 千2, 吴卫东*1
(1.陕西省环境监测中心站;2.瑞士万通中国有限公司,北京)
Determination of Chloride in Water by Automatic Potentiometric Titration Method
ZHOU Chi1, GUO Jinjun1, LIU Jianli1, ZHANG Qinming1, WANG Fei1, LV Qian2, WU Weidong1
(1.Shaanxi Environmental Monitoring center,xi’an;2.Metrohm China Co,Ltd,Beijing ,China)
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投稿时间:2023-01-30    修订日期:2023-02-27
中文摘要: 为了实现快速准确测定水中氯化物含量,建立了一种全自动电位滴定法测定水中氯化物的分析方法,对取样体积进行了优化,结果表明本方法最佳取样体积为50mL。研究了CO32-、S2-、I-、Br-等对氯化物测定结果的影响,并就干扰离子的消除提出了有效的方法,水样中加入1 ml (2+98)硝酸溶液可消除S2-、CO32-的干扰,当水样中I-、Br-浓度高于5mg/L时仪器可自动校正并扣除干扰。本方法检出限为0.19mg/L,大大低于水质 氯化物的测定 硝酸银滴定法GB 11896-89中规定的10 mg/L的要求,该方法测定地表水、地下水和工业废水实际样品,精密度为1.9%~2.3%,加标回收率为91.9%~99.0%。采用全自动电位滴定法测定水中氯化物,方法检出限低、精密度和正确度良好。本方法的建立为复杂环境水样中氯化物的准确测定提供了有益的技术支撑。
中文关键词: 氯化物  电位滴定  干扰  优化
Abstract:In order to achieve rapid and accurate determination of chloride content in water, a method for the determination of chloride in water by automatic potentiometric titration was established. Through optimizing the sampling volume, the results showed that the optimal sampling volume of this method was 50mL. The influence of CO32-, S2-, I-, Br- on the determination of chloride was studied, and an effective method was proposed to eliminate the interference ions. Adding 1 ml (2+98) nitric acid solution to the water sample can eliminate the interference of S2-, CO32-. When the concentration of I-, Br- in the water sample is higher than 5 mg/L, the instrument can automatically correct and deduct the interference. The detection limit of this method is 0.19 mg/L, which is much lower than the requirement of 10 mg/L specified in Water quality—Determination of chloride—Silver nitrate titration method GB 11896-89. The precision of this method is 1.9% - 2.3%, and the recovery rate of spiking is 91.9% - 99.0%. The automatic potentiometric titration method is used to determine chloride in water. The method has low detection limit, good precision and accuracy, which provides a useful technical support for the establishment of this method for the accurate determination of chloride in water samples in complex environments.
文章编号:     中图分类号:X824???    文献标志码:
基金项目:陕西省地方标准项目(SDBXM 38-2018);陕西省2023年重点研发项目(2023-YBSF-296,2023-YBSF-439)
引用文本:
周? 弛,郭晋君,刘建利,张秦铭,王? 斐,吕? 千,吴卫东*.全自动电位滴定法测定水中氯化物[J].中国无机分析化学,2023,13(11):1171-1175.
ZHOU Chi,GUO Jinjun,LIU Jianli,ZHANG Qinming,WANG Fei,LV Qian,WU Weidong.Determination of Chloride in Water by Automatic Potentiometric Titration Method[J].Chinese Journal of Inorganic Analytical Chemistry,2023,13(11):1171-1175.

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