Membrane potential studies of parchment supported silver oxalate membrane

Parchment-supported silver oxalate membrane has been prepared by the interaction method. the membrane potential across the membrane in contact with different 1:1 electrolytes has been measured. the experimentally measured membrane potential values were used to evaluate the thermodynamically effective fixed charge density of the membrane-electrolyte systems using teorell,meyer,and sievers (t. m. s.) [1,2] and kobatake et. al. [3] theories. the values of effective charge densities were quite low (they were in the order of 10-2 - 10-3 eq/l) and hence very difficult to determine by usual exchange methods. the values of effective charge densities by two theories were the same order of magnitude for each membrane-electrolyte system. membrane potential across silver oxalate membrane for a wide interval of concentrations at different concentration ratios (γ = 2,5,10,15,and 20) have been studied. the results have been analyzed by means of the kobatake equation for membrane potential. © 2017.