STREAMING POTENTIAL AND HYDRAULIC PERMEATION THROUGH CATION-EXCHANGE MEMBRANES

The streaming potential and the hydraulic permeation were obtained, un der different experimental conditions, for a cation-exchange membrane. From the measurements we have determined the phenomenological coeffic ients, L-ij, that enter the equations describing electrokinetic phenom ena according to the Thermodynamics of Irreversible Processes. The res ults obtained for the streaming potential are correlated to the result s obtained for electroosmosis, under the same experimental conditions, in a previous paper. It permits us to state that Onsager's reciprocit y relation holds up to 10(-1) mol/liter KCl concentration. The effecti ve fixed charge concentration was estimated from the results of the st reaming potential, hydraulic permeation and resistance of the membrane .