1977 Volume 50 Issue 12 Pages 3189-3193
The selectivity of liquid anion exchange membranes consisting of a perchlorate, thiocyanate, or iodide salt of Crystal Violet dissolved in nitrobenzene was studied by measuring membrane potentials. In bi-ionic systems the selectivity coefficient was observed to vary with the concentrations of aqueous solutions and of the ion exchanger in the membrane. This was attributed mainly to the ionic composition at the membrane-solution interface differing from that in the bulk solution. However, when the concentration of the aqueous solutions was sufficiently high in comparison with that of the ion exchanger, a selectivity coefficient intrinsic to a pair of counter ions was obtained. This selectivity coefficient was also applicable to mixed electrolyte systems and was shown to be consistent with the Conti-Eisenman theory on the relation between the selectivity coefficient and ionic parameters.
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