Neutrality-disturbance phenomenon of membrane-solution systems

Abstract The concentration polarization and the neutrality-disturbance phenomenon, or the pH-change, are investigated on several types of membranes in electrolyte solutions. The concentration polarization is considered to be a factor causing the phenomenon, but is not always sufficient, at least with cation-exchange membranes, to develop the phenomenon in a solution of NaCl. The extent to which the phenomenon takes place is a complicated problem. The occurrence and development of the phenomenon depend not only on the hydrodynamic flow conditions of the dialysate, but also on the nature of the counter ions and on the surface property of the membranes.