On the Electro-Osmotic Water Transport Through Cation—Exchange Resin Membranes

The water transference due to electroosmosis was studied for several cationexchange resin membranes of sulfonated phenol resin type, mainly in sodium chloride solution. It was shown that (1) the electroosmosis depended on the transport number of the membrane and the amount of water contained in the resin, and (2) the experimental results could be explained by introducing the idea of fixed water and mobile water in the membrane. The fixed water is supposed to be composed mainly of the hydration water attached to the polar groups of the resin.