Volumetric ion interaction parameters for single-solute aqueous electrolyte solutions at various temperatures

The ion interaction approach developed by Fitter allows the prediction of t hermodynamic characteristics of mixed electrolyte solutions at various temp eratures, if the respective parameters for each type of single electrolyte solution are known. Among such thermodynamic characteristics are the volume tric ones (density and apparent molal volumes). A database for the densitie s and the apparent molal volumes versus concentrations was developed at a t emperature interval of 288.15-368.15 K using all available literature sourc es for each single electrolyte solution formed by various electrically neut ral combinations of the following ions (Na+, K+, Mg2+, Ca2+, Sr2+, Ba2+, Cl -, Br-, HCO3-, CO32-, and SO42-). these are the most important ions for ind ustrial solutions as well as for natural waters. Statistical treatment was applied to this database in order to discard Door data. The proper treatmen t of all sound quality apparent molal volumes, in a wide range of concentra tions from infinite dilution through saturation, allowed us to compute sets of volumetric ion interaction parameters ((V) over bar (0)(MX), beta ((0)V )(MX), beta ((1)V)(MX), beta ((2)V)(MX), and C-MX(V)) at various temperatur es in a 288.15-368.15 K temperature interval, The validity of the selected sets at various temperatures was demonstrated by a comparison of the experi mental and calculated densities for multiple-solute electrolyte solutions c ontaining NaCl, KCl, MgCl2, and CaCl2 with an ionic strength reaching 9.23 that resembled Dead Sea water. (C) 2001 American institute of Physics.