Interparticle interactions in rare gas-H2O(D2O)-Potassium bromide systems according to data on the solubilities of argon and krypton

The solubilities of krypton in H/D isotope substituted aqueous solutions of potassium bromide were measured in a wide range of solution compositions at 0.1 MPa and 278.15-318.15 K. The results were used to calculate the Sechenov parameters of gas solubility and the coefficients of the McMillan-Mayer virial expansion, which corresponded to the contributions of gas-potassium bromide pair intermolecular interactions to the thermodynamic functions of solvation of krypton. These data were compared with the corresponding characteristics of argon obtained earlier and with the volume properties of water(heavy water)-potassium bromide systems. The isotope effects on the limiting partial molar volumes of the electrolyte were found to correlate with the isotopic effects on the thermodynamic parameters of solvation of rare gases. A stoichiometric [K + + Br] mixture of the ions was found to have approximately equal total effects on the structures of the H/D water isotopomers at temperatures 300 K. It was suggested that argon could be used as a structurally sensitive probe.