Thermodynamic study of (KCl plus proline plus water) system based on potentiometric measurements at T = (298.2 and 303.2)K

In this paper, the results relating to the thermodynamic properties of (KCl + proline + water) system using the potentiometric method are reported. The electromotive force (emf) measurements were performed on the galvanic cell of the type: Ag vertical bar AgCl vertical bar KCl (m), proline (w%), H2O (1 - w)%vertical bar K-ISE, in various mixed solvent systems containing 0, 2.5, 5.0, 7.5, 10.0 and 12.5% mass fraction of proline over ionic strength ranging from 0.0010 to 3.9578 mol.kg(-1) at T = (298.2 and 303.2) K. The modeling of this ternary system was made based on the Pitzer ion-interaction model. The resulting values of the mean activity coefficients, the osmotic coefficients and the excess Gibbs free energy together with Pitzer ion-interaction parameters (beta((0)), beta((1)) and C-phi) for the series under investigated system are reported. (C) 2012 Elsevier B.V. All rights reserved.