Low-temperature thermodynamic model for the system Na2CO3−MgCO3−CaCO3−H2O

E. Königsberger; L.C. Königsberger; H. Gamsjäger

doi:10.1016/S0016-7037(99)00238-0

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Low-temperature thermodynamic model for the system Na2CO3−MgCO3−CaCO3−H2O

Journal article

Peer reviewed

Low-temperature thermodynamic model for the system Na2CO3−MgCO3−CaCO3−H2O

E. Königsberger, L.C. Königsberger and H. Gamsjäger

Geochimica et Cosmochimica Acta, Vol.63(19-20), pp.3105-3119

1999

DOI: https://doi.org/10.1016/S0016-7037(99)00238-0

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Abstract

A comprehensive low-temperature thermodynamic model for the geochemically important Na2CO3-MgCO3-CaCO3-H2O system is presented. The model is based on calorimetrically determined Δ(f)H298°values, S298°values and C(p)°(T) functions taken from the literature as well as on μ298°values of solids derived in this work from solubility measurements obtained in our laboratories or by others. When these thermodynamic quantities were combined with temperature-dependent Pitzer parameters taken from the literature, solubilities calculated for a wide range of conditions agree well with experimental data. The results for several subsystems were summarized by depicting the respective phase diagrams. For the MgO-CO2-H2O subsystem, it was found that the commonly believed stability relations must be revised, i.e., in the temperature range covered, nesquehonite never becomes more stable than hydromagnesite at p(CO(2)) ≤ 1 atm. Although the recommended set of thermodynamic data on sparingly soluble solids was derived from experimental results on mainly NaClO4 systems, it can be incorporated in databanks containing additional Pitzer parameters for modeling more complex fresh- or seawater systems.

Details

Title: Low-temperature thermodynamic model for the system Na2CO3−MgCO3−CaCO3−H2O
Authors/Creators: E. Königsberger (Author/Creator) - Montanuniversität Leoben
L.C. Königsberger (Author/Creator) - Montanuniversität Leoben
H. Gamsjäger (Author/Creator) - Montanuniversität Leoben
Publication Details: Geochimica et Cosmochimica Acta, Vol.63(19-20), pp.3105-3119
Publisher: Elsevier BV
Identifiers: 991005541832507891
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Citation topics: 2 Chemistry; 2.165 Nanofibers, Scaffolds & Fabrication; 2.165.1082 Calcium Carbonate Crystallization
Web Of Science research areas: Geochemistry & Geophysics
ESI research areas: Geosciences