Abstract
A systematic study with the negatively charged cation-exchange resin Amberlite 200 was performed to investigate the influence of anion type on cation exchange. A comprehensive data set was obtained for binary and ternary cation exchanges involving Na, Mg, and Zn on a strongly acidic, sulfonate cation-exchange resin in electrolyte systems with the single anions chloride, perchlorate, and sulfate, and with 1:1 mixtures of them at two total cation concentrations of 0.05 and 0.2 N. The binary and ternary cation exchange data exhibited internal consistency in that Mg and Zn were selected over Na to a comparable degree. The binary and ternary cation exchange data also indicated clearly an effect of anion type, with reduction in selectivity of Mg and Zn relative to Na in the presence of more strongly complexing anions such as sulfate. The effects of anions in cation exchange may be ascribed in part to their association with cations in solution, as demonstrated by application of conventional mass action models fo...
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