Original paper

Data and models for calculating the standard thermodynamic properties of aqueous non-electrolyte solutes under hydrothermal conditions

Sedlbauer, Josef; Majer, Vladimir

European Journal of Mineralogy Volume 12 Number 6 (2000), p. 1109 - 1122

51 references

published: Nov 17, 2000
manuscript accepted: Jul 18, 2000
manuscript received: Mar 14, 2000

DOI: 10.1127/0935-1221/2000/0012-1109

BibTeX file

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Abstract The standard chemical potentials μ0s of aqueous solutes over a wide range of temperatures and pressures are needed to calculate phase and chemical equilibria in hydrothermal systems. The standard derivative thermodynamic properties of solutes such as enthalpies, heat capacities and volumes can be integrated to calculate μ0s at superambient conditions. These derivative properties can be obtained by extrapolation to infinite dilution of calorimetric and volumetric data for aqueous solutions measured as a function of concentration at various temperatures and pressures. A large amount of new experimental results has been reported over the past two decades, which allowed improvement of predictions based on equations of Helgeson, Kirkham and Flowers, among others. Several new thermodynamic models for the standard thermodynamic properties have been proposed during this period. This paper focuses on non-electrolyte solutes and provides an overview of the recent sources of experimental data. We also compare the ability of several thermodynamic models to correlate and predict μ0s


aqueous solutionsnon-electrolyte solutesstandard chemical potentialHenry’s constantheat capacitydensitythermodynamic modelshydration properties