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水的总硬度测定

水的总硬度测定. 水硬度的测定. 采用何种方法测定？ 测定体系的 pH 条件？ 如用滴定的方法，如何选用指示剂？ 水中有哪些物质？如何消除干扰？ 水中钙、镁能否分别滴定？为什么？. 水的硬度是表示水质的一项重要指标 , 水的总硬度是以钙、镁总量折算成 CaO 的量来衡量的。. 常用金属指示剂. 铬黑 T （ Eriochrome Black T ， EBT ） 1-(1- 羟基 -2- 萘偶氮 )-5- 硝基 -2- 萘酚 -4- 磺酸钠. p K a =6.3 p K a = 11.6

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水的总硬度测定

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