Thermodynamic Properties of Aqueous Species Calculated Using the HKF Model: How Do Different Thermodynamic and Electrostatic Models for Solvent Water Affect Calculated Aqueous Properties?
Joint Authors
Miron, George D.
Leal, Allan M. M.
Yapparova, Alina
Source
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-24, 24 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-02-07
Country of Publication
Egypt
No. of Pages
24
Main Subjects
Abstract EN
Thermodynamic properties of aqueous species are essential for modeling of fluid-rock interaction processes.
The Helgeson-Kirkham-Flowers (HKF) model is widely used for calculating standard state thermodynamic properties of ions and complexes over a wide range of temperatures and pressures.
To do this, the HKF model requires thermodynamic and electrostatic models of water solvent.
In this study, we investigate and quantify the impact of choosing different models for calculating water solvent volumetric and dielectric properties, on the properties of aqueous species calculated using the HKF model.
We identify temperature and pressure conditions at which the choice of different models can have a considerable effect on the properties of aqueous species and on fluid mineral equilibrium calculations.
The investigated temperature and pressure intervals are 25–1000°C and 1–5 kbar, representative of upper to middle crustal levels, and of interest for modeling ore-forming processes.
The thermodynamic and electrostatic models for water solvent considered are: Haar, Gallagher and Kell (1984), Wagner and Pruß (2002), and Zhang and Duan (2005), to calculate water volumetric properties, and Johnson and Norton (1991), Fernandez and others (1997), and Sverjensky and others (2014), to calculate water dielectric properties.
We observe only small discrepancies in the calculated standard partial molal properties of aqueous species resulting from using different water thermodynamic models.
However, large differences in the properties of charged species can be observed at higher temperatures (above 500°C) as a result of using different electrostatic models.
Depending on the aqueous speciation and the reactions that control the chemical composition, the observed differences can vary.
The discrepancy between various electrostatic models is attributed to the scarcity of experimental data at high temperatures.
These discrepancies restrict the reliability of the geochemical modeling of hydrothermal and ore formation processes, and the retrieval of thermodynamic parameters from experimental data at elevated temperatures and pressures.
American Psychological Association (APA)
Miron, George D.& Leal, Allan M. M.& Yapparova, Alina. 2019. Thermodynamic Properties of Aqueous Species Calculated Using the HKF Model: How Do Different Thermodynamic and Electrostatic Models for Solvent Water Affect Calculated Aqueous Properties?. Geofluids،Vol. 2019, no. 2019, pp.1-24.
https://search.emarefa.net/detail/BIM-1153981
Modern Language Association (MLA)
Miron, George D.…[et al.]. Thermodynamic Properties of Aqueous Species Calculated Using the HKF Model: How Do Different Thermodynamic and Electrostatic Models for Solvent Water Affect Calculated Aqueous Properties?. Geofluids No. 2019 (2019), pp.1-24.
https://search.emarefa.net/detail/BIM-1153981
American Medical Association (AMA)
Miron, George D.& Leal, Allan M. M.& Yapparova, Alina. Thermodynamic Properties of Aqueous Species Calculated Using the HKF Model: How Do Different Thermodynamic and Electrostatic Models for Solvent Water Affect Calculated Aqueous Properties?. Geofluids. 2019. Vol. 2019, no. 2019, pp.1-24.
https://search.emarefa.net/detail/BIM-1153981
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1153981