离子色谱法测定水中钙和镁

ION CHROMATOGRAPHIC DETERMINATION OF Ca^(2+) AND Mg^(2+) IN WATER

水的硬度测定 ,通常采用 EDTA滴定法。文中改用离子色谱法测定 ,一次进样后同时测定水样中 mg· L-1级的钙和镁 ,然后换算成以 mg· L-1碳酸钙表示的硬度。方法的回收率在 98.2 %～ 1 0 2 .0 %之间 ,相对标准偏差为 0 .94%～ 1 .2 1 % ,具有简便、快速、准确的特点。

The determination of total hardness in water by Ion chromatography is reported in this paper. In this method, the concentration of Mg 2+ and Ca 2+ are determined directly and the total hardness in water is found by substituting these data into the formula deduced by the author. Recoveries of 98.2%~102.0% and RSD′s of 0 94%~1.21% are obtained. This method is proved to be simple, rapid and accurate.