Ability of the Ion-Selective Electrode in the Thermodynamic Modeling of the Mixed Electrolyte System: The Case of the Ternary NH4Cl + KCl + H2O Mixed Electrolyte Systems

作者：Deyhimi Farzad; Abedi Maryam; Karimzadeh Zohreh^*

来源：Journal of Chemical and Engineering Data, 2014, 59(8): 2428-2432.

DOI：10.1021/je500134p

With the recent development and apparition of new sensors and selective membranes, ion-selective electrodes (ISEs) have become an attractive alternative method to the more usual vapor pressure or solvent activity methods for the investigation of thermodynamic properties of electrolyte systems. In this context, it seemed interesting to explore the ability of the ion-selective electrode in the thermodynamic modeling of mixed electrolyte systems. For this purpose, the mixed 1:1 electrolyte system with a common anion, namely the ternary NH4Cl + KCl + H2O electrolyte system was selected, in which the corresponding NH4+ and K+ cations are considered mutually as severe interfering ions for K+ ISE and NH4+ ISEs, respectively. In addition, Pitzer ion-interaction theory for mixed salts was applied for modeling the behavior of ternary electrolyte systems in concentrations ranging from 0.01 mol/kg up to 5 mol/kg, at 298.15 K. The reported results show, effectively, how the magnitude of the potentiometric selectivity coefficient (K-12(pot)) of these ISEs, could play as limiting factors on the investigation of these systems.

• 出版日期2014-8