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Ion exchange membranes with high permselectivity (the character of separating cations from anions or anionsfrom cations) and high selectivity (the character of separating cations or anions of different valencies) are important forelectrodialysis process. The Donnan equilibrium theory, based on the equilibrium of ions and no electric field, can not ex-actly explain the permselectivity of ion exchange membrane for ED process, since it is impossible to set up a ion exchangeequilibrium between membrane and solution and to neglect the influence of electrical driving force on ions during ED proc-ess. A novel model named “anti-electric potential” is established to interpret the permselectivity of ion exchange membrane,according to the determination of electric potential between membranes and the variation of elements content in solutionsand membranes. The results of experiment prove that the “anti-electric potential” really exists within membranes. As for theselectivity, the results reveal that electric potenti
Ion exchange membranes with high permselectivity (the character of separating cations from anions or anions from cations) and high selectivity (the character of separating cations or anions of different valencies) are important forelectrodialysis process. The Donnan equilibrium theory, based on the equilibrium of ions and no electric field, can not ex-actly explain the permselectivity of ion exchange membrane for ED process, since it is impossible to set up a ion exchange unequilibrium between membrane and solution and to neglect the influence of electrical driving force on ions during ED proc-ess . A novel model named “anti-electric potential” is established to interpret the permselectivity of ion exchange membrane, according to the determination of electric potential between membranes and the variation of elements content in solutions and membranes. The results of experiment prove that the “anti-electric potential ” really exists within membranes. As for theselectivity, the results revea l that electric potenti