ArticleMetal-organic complexes in geochemical processes: Estimation of standard partial molal thermodynamic properties of aqueous complexes between metal cations and monovalent organic acid ligands at high pressures and temperatures
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Experimental determination of calcite solubility and the stability of aqueous Ca– and Na–carbonate and –bicarbonate complexes at 100–160 °C and 1–50 bar pCO<inf>2</inf> using in situ pH measurements
2020, Geochimica et Cosmochimica ActaCitation Excerpt :The agreement was within 0.01–0.04 log units, except for the calculated Q1 at 150 and 200 °C where the HKF evaluation was 0.09 and 0.14 log units lower, respectively. The aqueous species and solid component HKF parameters in the CaCO3-H2O system were taken from the Slop07 database (Shock and Helgeson, 1988; Shock and Koretsky, 1995; Shock et al., 1997; Sverjensky et al., 1997; Geopig, 2010). In the present study, the stability constants were determined using an isothermal cell with transfer operating simultaneously with two electrode systems:
Data analysis and estimation of thermodynamic properties of aqueous monovalent metal-glycinate complexes
2019, Fluid Phase EquilibriaCitation Excerpt :Nevertheless, it is important to note that the standard state equilibrium constant of a metal-glycinate reaction is sensitive to the changes in ionic strength, pH, and temperature. Therefore, any small change in these parameters could influence the dissolution or precipitation of minerals [14]. In this study, the average standard state equilibrium constants of metal-glycinate association are calculated based on experimental data that are available in the literature (see Tables 1–4).
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Present address: Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD 21218, USA.