Abstract
A study has been made of the carrier mechanism of the migration of cations through a non-aqueous liquid membrane. The liquid membrane is a layer of a solution of an amphipatic polyacid—the alternate copolymer of maleic acid and hexadecyl vinyl ether—in N-octanol. The membrane separates two aqueous solutions containing a mixture of electrolytes NaCl and CaCl 2 at varying pH. A description of the thermodynamic and structural properties of the polymer in N-octanol is given. Flux measurements of cations across the membrane are reported for symmetrical situations (unidirectional fluxes) and in the case of asymmetry when the acid and salt concentrations in the aqueous phase were different. In the latter case, incongruent fluxes of sodium ions are found and the mechanism of countertransport is analyzed quantitatively on the basis of the thermodynamic data relating to the affinities of the polymeric acid sites towards alkali and alkaline-earth metal ions in the low dielectric constant medium.
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