测定自来水的总硬度(微型滴定法)  

Determination of Total Hardness of Tap Water(Micro-titration)

作　　者：马志彦 

机构地区：[1]西北民族大学化工学院,甘肃兰州730000

出　　处：《化工设计通讯》2017年第3期115-115,共1页Chemical Engineering Design Communications

摘　　要：测定自来水的总硬度采用微型滴定法,要掌握测定的基本原理,以及EDTA的标定方法。实验中一般使用在水中溶解度较大的乙二胺四乙酸二钠盐(Na_2H_2Y·2H_2O)替代EDTA。用EDTA溶液标定时,对于不同的测定对象,要选择不同的基准物质。同时为了减少测量误差,标定EDTA应该选择与被测组分相同的基准物质,保持标定和测定的条件相同。自来水硬度的测定对我们分析生活饮用水或工业用水有重要意义,可将实验测得的自来水的总硬度与国家规定标准含量进行对比,来判断生活用水是否合格。Determination of the total hardness of tap water using micro-titration method, to master the basic principles of determination, and EDTA calibration method.In the experiment, EDTA was replaced by ethylanediamine tetraacetic acid disodium salt （Na2H2Y · 2H2O） with high solubility in water.When calibrating with. EDTA solution, different reference substances should be selected for different assay objects.At the same time in order to reduce the measurement error, calibration EDTA should be selected with the measured components of the same reference material, to maintain calibration and determination of the same conditions.Determination of the hardness of tap water for our analysis of drinking water or industrial water is important, can be measured by the total hardness of tap water and the standard content of the state to compare, to determine whether our domestic water is qualified.

关 键 词：自来水 总硬度 测定 

分 类 号：R123[医药卫生—环境卫生学]