The Donnan Potentials of Polysulfonated Cation Exchange Membranes

Membrane potentials of polysulfonated cation exchange membranes insert ignore into journalissuearticles values(unsupported polysulfone, SA 3 S and polyester supported polysulfone, SA 3 T); for KCl, NaCl and LiCl solutions using Ag/AgCl electrodes were measured. The measurements were carried out for, KCl SA 3 S or SA 3 T MCL, insert ignore into journalissuearticles values(M: K, Na and Li); systems. The concentration of salt insert ignore into journalissuearticles values(KCl); was kept constant in one side of the cell, C 1 , at 1.10 - 2 M was changed in the other side of the cell C 2 , from 1.10 -4 to 2.0 M . The alteration graphs were drawn in order to find the potential values of membranes for   insert ignore into journalissuearticles values( ln C 2 ); changes. Using the Donnan equation and the Teorrel Meyer Sievers theory, Donnan potentials were calculated   theoretically. It was found that it had been dependent on ionic concentration of external solution. Donnan potential values determined for both membranes are parallel at 0.05 M concentration but there is deviation this value.