Studies with model membranes. XXII. Evaluation of thermodynamic parameters and testing of theories of membrane and bi‐ionic potential based on nonequilibrium thermodynamics

Abstract

SynopsisThermodynamically effective fixed-charge density of mercuric phosphate and carbonate parchment-supported membranes have been evaluated by the most recent method of Nagasawa et al., based on the thermodynamics of irreversible processes and compared with the values obtained by the Kobatake et al. and TeoreU-MeyerSievers (TMS) methods. Bi-ionic potential (BIP) has also been measured for these membranes with three pairs of electrolyte solutions: KCl-NaCl, KCl-LiCl. and NaC1-LiCl. Theoretical values of BIP have been calculated by using the membrane potential and BE' theories recently developed by Toyoshima et aL, based on nonequilibrium thermcdynamics.Various parameters have also been evaluated and it was found that the theoretical equation of BIP is applicable to these parchment-supported membranes.