离子色谱法测定水中钙和镁

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

水的硬度测定 ,通常采用EDTA滴定法。文中改用离子色普法测定 ,一次进样后同时测定水样中mg/L级的钙和镁 ,然后换算成以mg/L碳酸钙表示的硬度。方法的回收率在 98 4%～ 1 0 2 2 %之间 ,相对标准偏差为 0 .95 %～ 1 2 2 % ,具有简便、快速。

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 98.4%～102.0% and RDS's of 0.95%～1.20% are obtained. This method is proved to be simple, rapid and accurate.