Abstract
The ion interaction approach of Pitzer permits the prediction of thermodynamic
characteristics of multiple-electrolyte solutions if the ion interaction
parameters (Pitzer parameters) for each type of single-electrolyte
solutions are known. The purpose of the present paper is to suggest
the best sets of volumetric Pitzer parameters, V(MX)oBAR, beta(MX)(O)V,
beta(MX)(1)V, beta(MX)(2)V and C(MX)V, at 25-degrees-C for salts
formed from Na+, K, Mg2+, Ca2+, Cl-, Br-, HCO3-, CO32- and SO42-
ions. Using essentially all published relevant experimental data,
a database for the mass densities and apparent molar volumes at 25-degrees-C
vs. the solute concentration has been created for each single-electrolyte
solution type. Unreliable data were discarded by an appropriate statistical
lest. The remaining data, covering solute concentrations from infinite
dilution to saturation, were used to compute the unrestricted and
restricted sets of volumetric Pitzer parameters by least squares.
Taking the differences between the calculated and experimental densities
and apparent molar volumes as the criterion of quality , the best
set of volumetric Pitzer parameters was selected for each type of
electrolyte and was used to calculate the mass densities, at 25-degrees-C,
of some multiple-electrolyte solutions resembling Dead Sea waters.
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