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A stoichiometrical ion-exchange was observed for all the systems of Mg2+, Ca2+, Sr2+, and Ba2+ with H+ in the crystalline antimonic(V) acid as a cation exchanger. The selectivity sequence, Mg2+<Ba2+<Sr2+<Ca2+, has been found for the ion-exchange reactions in 0.1 M nitrate salt solutions of different alkaline earth metals. Breakthrough and further elution studies were carried out in order to test the reversibility of the ion-exchange reactions. X-Ray analysis indicates that a solid solution forms for the ion-exchange system of the alkaline earth metal ions in the crystalline antimonic(V) acid.
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Mitsuo Abe (1979) studied this question.
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