Studies with inorganic precipitate membranes. IV. Evaluation of apparent fixed charge on membranes

Membrane potentials arising across four parchment-supported ferrocyanide membranes of manganese, cobalt, silver, and cadmium when they separate 1:1 electrolyte solutions of concentration C₁ and C₂ such that C₁ = 10C₂, have been measured. The data have been used according to the procedure prescribed by one of the theories of membrane potential due to Teorell and Meyers and Sievers to derive values for the quantity of charge present on the membranes. An alternative procedure employed by Altug and Hair has been considered and found to overestimate the value for the charge on the membranes.