Difference in transfer of magnesium and sodium ions through electrodialytic membranes modified with chitosan

The difference in transfer of magnesium and sodium ions through electrodialytic cation-exchange membranes modified with chitosan was studied. The membranes were modified by electrodeposition of chitosan from solution on the membrane surface in the course of electrodialysis, preliminary sorption of chitosan on the membrane surface from aqueous chitosan hydrochloride, or application of a chitosan film to the dry membrane surface. The Mg²⁺/Na⁺ selectivity of transfer through modified electrodialytic membranes was examined in relation to the current density.