Dependence of the calcium distribution coefficient on a strongly acidic cation-exchange resin on the anion of strong acids and their lithium salts

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Abstract

The dependence of the calcium distribution coefficient on the anion of strong acids HX

as well as on their lithium salts from 0.1 M up to high concentrations has been tested on the strongly acidic cation exchanger Dowex 50W-X12. Under the same experimental conditions, the distribution coefficient decreases in the following order:
. This can be explained in terms of the different anion-calcium interaction's. Using acids as electrolyte, the distribution coefficient exhibits a minimum value in the range of 4–6 M HX and rises at higher concentrations. However, no minimum value was found in systems with the lithium salts over the whole investigated concentration range. The effect on chromatographic separations of the dependence of the distribution coefficient on the anion is discussed.

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