水硬度的测定及其对人类生活水平的影响

Analysis of the Relationship between W ater Hardness and Human Life and Its Determination

水的硬度指的是水中钙离子和镁离子的含量,生活中饮用中等硬度的水对人体是有好处的,它可以补充人体所需的钙镁离子含量,同时这样的水口感也很清爽。测定水硬度的方法有:化学分析法、原子吸收法、分光光度法、电化学分析法等。文章主要阐述化学分析法即以EDTA为标准溶液,以铬黑T为指示剂测定钙镁离子总含量即水的总硬度过程中的注意事项。

The hardness of water refers to the content of calcium and magnesium ions in water.Drinking water of medium hardness is good for human body.It can supplement the content of calcium and magnesium ions needed by human body.Water hardness can be measured by chemical analysis,atomic absorption,spectrophotometer,electrochemical analysis,and so on.In this paper,the points for attention in the process of determination of total hardness of water with EDTA as standard solution and Chrome black T as indicator are described.