Various membrane parameter such as membrane potential, bi­ionic potential, permselectivity of these membranes have been determined. Thermodynamically effective fixed charge density and the impedance characteristics of inorganic precipitate membranes have also been analysed in order to understand the mechanism of ionic diffusion through bio-membranes. The observed value of membrane capacitance and resistance were found to be dependent on the concentration of bathing electrolyte and applied frequency. The complex impedance spectra have been found to deviate from the theoretical predicitions at low frequencies due to non homogenious and rough surface of the membrane.