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Studies on the Development of Membrane Potentials and Evaluation of Apparent Fixed Charge Densities of Porous Membranes Impregnated with Potassium Zinc Ferrocyanide Precipitate in Presence of Alkali Chloride Solutions

Membrane potentials developed across two porous membranes, parchment and cellophane, impregnated with potassiun zinc ferrocyanide precipitate, have been studied in presence of LiCl, NaCl and K.C1 solutions in the concentration range 0.0001 to 0.5 mol dm" . The values show the trend K > Na > Li, but differ in magnitudes in the two membranes, and also deviate from the theoretical Nernstian value, more towards the concentrated range. The parchment membrane shows relatively good behaviour. Attempts have been made to calculate the apparent charge densities with the help of some equations like those of TMS, ALTUG and HAIR, KOBATAKE et al. and KAMO et al. Despite the different approaches for these equations, the results are quite agreeable with each other within the limits of the experiments.