用钙试剂羧酸钠为指示剂络合滴定法测定降水中钙离子

Determination of the Calcium Ion in the Rain by Complex Titration with the Indicator Ca Reagent Carboxylic Acid Sodium

提出用钙试剂羧酸钠作指示剂络合滴定法测定降水中钙离子 ,在自然条件下终点的观察即能顺利进行。同《空气和废气监测分析方法》中钙离子络合滴定法相比较 ,此法终点敏锐 ,回收率为 95 %～ 1 0 0 % ,相对标准偏差均小于 2 .7% ,方法简便、快速、准确、灵敏。具有推广性。

Using the Ca reagent carboxylic acid Na as the indicator for the determination of calcium ion in the rain was reported. The whole experiment can be carried out under the natural condition. Compared to the complex titration for the calcium ion commenced in the (Superrising & Analysis of Air & Waste Gas), the end point is sensitive. The recoveries were from 95.0% to 100%, and the relative standard deviations were less than 2.7%. The advantages of this method are simple, rapid, accurate and sensitive.