ELECTROCHEMICAL CHARACTERIZATION OF A HEMODIALYSIS MEMBRANE

Transport parameters characterizing a commercial hemodialysis membrane (AN69, Hospal), with and without pretreatment with an adsorbed albumi n layer, were determined as a function of the external sodium chloride equilibrium concentration. Measurements included membrane potential, streaming potential, and electroosmosis data. Transference numbers of cations and water were directly calculated from these data and were ch aracteristic of high permselectivity at low ionic strength. Model-depe ndent parameters of the charged membrane, such as zeta potential and f ixed charge density, were also calculated.