INFLUENCE OF THE NATURE OF CATION ON WATER-SPLITTING AT THE INTERFACEOF A CATION-EXCHANGE MEMBRANE DURING ELECTRODIALYSIS

The phenomenon of water splitting occuring at the interface of a Selem ion CMV cation exchange membrane in contact with solutions containing successively monovalent, divalent and trivalent cations was investigat ed. Under identical hydrodynamic conditions, this investigation is bas ed on recording j-V curves, measurement of transport numbers and pH va riations. Water splitting is not a direct consequence of-concentration polarization phenomenon. The cation nature and especially its acidic character is an important parameter which explains the difference in t he behavior of the Selemion CMV membrane in contact with solutions of different cations.