Thermodynamic modeling of the KCl plus glucose plus water system based on potentiometric measurements at 298.15 K

In this work, the results relating to the mean activity coefficient measurements for KCl in the KCl + glucose + water system using the potentiometric method are reported. The potentiometric measurements were performed on the galvanic cell of the type: Ag[AgCl]KCl (m), glucose (wt.%), H2O (1 wt) %[K-ISE, in various mixed solvent systems containing 0, 10, 20, 30, and 40% mass fractions of glucose over ionic strength ranging from 0.0001 to 4.000 kgmol(-1). The Pitzer ion-interaction model and the modified three-characteristic-parameter correlation model were used for the experimental data correlation and calculation of thermodynamic properties. The adjustable parameters for each of them were determined. Then, these parameters were used to calculate the values of thermodynamic properties for under investigated systems. The results clearly indicate that a good correlation is obtained with the Pitzer model to describe this system. (C) 2010 Elsevier B.V. All rights reserved.