Abstract
It has been shown that the diffusion coefficient of a salt in a homogeneous nonionic membrane may readily be evaluated from the electrical conductivity of the membrane when it is immersed in an aqueous salt solution. The diffusion coefficient of sodium chloride in dense isotropic cellulose acetate membranes has been measured by this method, and the activation energy for diffusive salt transport has been obtained from the temperature dependence. The effect of heat-treatment temperature on the electrical conductivity of anisotropic gel membranes has also been examined, and an estimate of the thickness of the “active layer”was obtained from these data.
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