The metal capacity vs pH contours and the separation ratios for copper, zinc, and aluminum have been studied for an oxine-containing, chelating ion-exchange resin. Metal-metal exchange studies on this resin involving the three metals have demonstrated that this is not a simple substitution process, sorption and desorption of the ions being controlled by solution concentration. The sterically hindered ligand, 8-hydroxyquinaldine, incorporated in a resin, demonstrated much greater selectivity for other metals over aluminum and confirmed published solvent extraction data for this ligand.
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Vernon et al. (1978) studied this question.
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