Studies with Parchment Supported Membranes. VIII. Determination of the Thermodynamic Effective Fixed Charge Density of Barium Phosphate Membrane by Various Methods and Evaluation of Permselectivity

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Abstract
The thermodynamic effective fixed charge density, the most important parameter governing transport phenomena in membranes, was estimated by methods of TMS, Altug and Hair and the most recent one of Kobatake based on the thermodynamics of irreversible processes. Kobatake’s equation has also been utilized for the evaluation of permselectivity of membranes. The two limiting forms of his equation for dilute and concentrated ranges gave identical values of θ (charge density) for barium phosphate membrane. The theoretical predictions for membrane potential by the equation were borne out quite satisfactorily by experimental results obtained with the investigated membranes.

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