The Cation Exchange Adsorption of Calcium and Strontium from an Ammonium Formate or Ammonium Acetate Solution in Mixtures of Organic Solvents and Water

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Abstract
Ion exchange equilibria of calcium- and strontium-ammonium exchange systems have been studied in methanol-water, acetone-water and dioxane-water mixtures in which acetate or formate ions co-exist as a complexing anion. The selectivity coefficients of calcium against ammonium and those of strontium against ammonium decrease, while the separation factor between strontium and calcium increases, with an increase in the organic solvent concentration. Therefore, by the column operation, calcium can easily be eluted from the column, and strontium can be well separated from calcium when a suitable elutriant with a high separation factor between strontium and calcium and with a low selectivity coefficient of calcium against ammonium is selected. A 1 : 1 mixture of a 2 m ammonium formate aqueous solution and acetone or a 1 : 1 mixture of a 2 m ammonium acetate aqueous solution and methanol is recommended. When strontium in a large amount of calcium is to be analyzed, the latter elutriant is the most suitable.

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