水中总硬度的自动电位滴定法的两种测定模式  

Determination of Drinking Water Total Hardness Using Automatic Potentiometric Titration in Two Modes

作　　者：倪蓉[1] 杨龙彪[1] 张燕[1] 

机构地区：[1]上海市徐汇区疾病预防控制中心检验科,上海200031

出　　处：《环境与健康杂志》2008年第10期908-910,共3页Journal of Environment and Health

摘　　要：目的建立水中总硬度的自动电位滴定仪检测方法。方法采用 DET 模式(动态滴定模式)测定总硬度高的样品,MET 模式(等体积滴定模式)测定总硬度低的样品。结果用 DET 模式测定高硬度(48.0～220.5 mg/L)的样品时,RSD为0.7%～1.7%,回收率为101.5%～102.2%(本底值l73.2 mg/L);用 MET 模式检测低硬度(0.57～3.59 mg/L)的样品时,RSD为3.5%～4.0%,回收率为95.8%～103.6%。结论该方法具有快速、简单的特点;结果准确可靠,重现性好,适用于检测大批量各种总硬度含量的水样。Objective To establish a method for determination of total hardness in drinking water by using automatic potentiometrie titrator. Methods Dynamic equivalence point titration （DET） and monotonic equivalence point titration （MET） mode was used to determine the high total hardness and low total hardness of drinking water samples respectively. Results Used DET mode to determine the high total hardness, the relative standard deviation （RSD） was 0.69%-1.72% and the recovery rate was 101.5%-102.2%. Used MET mode to determine the low total hardness, RSD was 3.49%-4.00% and the recovery rate was 95.8%-103.6%. Conclusion This method is rapid, simple, accurate, precise and applicable to the determination of total hardness in drinking water in low and high levels.

关 键 词：水 电位测定法 总硬度 

分 类 号：O657.1[理学—分析化学]