Abstract
Cationic membranes were prepared by quaternizing poly(chloromethylstyrene-codivinylbenzene) membrane with triethyl, tri-n-propyl and tri-n-octyl amines. The permeabilities of NaCl, NaBr, NaI and NaNO 3 were measured. The dependence of the permeabilities on the upstream salt concentration was not of a simple Donnan exclusion type, which is unusual. The permeability of the membrane quaternized with triethylamine for NaI showed a marked decrease with upstream salt concentration up to ca. 0.1 mol/l and leveled off thereafter. The permeability of the membrane quaternized with tri-n-propylamine for NaCl, NaBr and NaNO 3 showed minima at relatively low upstream salt concentrations. These results, together with the sorption isotherms, were qualitatively discussed in terms of dual sorption and diffusion modes of the salts
Published Version
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