Abstract
The inorganic counter-ion of an ion-exchange resin affects retention of organic solutes in several ways, such as the formation of co-ordination complexes, ion-dipole interaction, ionic hydration and hydrogen bonding. To study these effects the retention of sugars and sugar alcohols, amino acids and hydroxy acids has been measured on a column of polystyrene-based cation-exchange resin, carrying these counter-ions: Li +, K +, Ca 2+, La 3+. The eluent was water or, in some cases, a salt solution. To correlate retention with complex stability the solubility of calcium sulfate was measured in solutions of the ligands mannitol, sorbitol, glycine, α- and β-alanine. We concluded that the calcium complexes are about as stable in the ion-exchange resin as in aqueous solution.
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