The stability of the magnesium bicarbonate ion pair from 10 degrees to 90 degrees C

Siebert, R. M.; Hostetler, P. B.

doi:10.2475/ajs.277.6.697

Cited by 33 publications

(8 citation statements)

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“…As in the case of carbonate complexes, studies concerning the alkali earth bicarbonate system are considered to be the most reliable ones and thus, association constants for Ca, Mg, Sr, and Ba with bicarbonate can be regarded as well established. The data are (with uncertainties of 2' standard deviation): MgHCO 3 þ 1:07 AE 0:06 [60], CaHCO 3 þ 1:11 AE 0:07 [61], SrHCO 3 þ 1:18 AE 0:14 [62], and BaHCO 3 þ 0:98 AE 0:12 [63]. The maximum difference in these constants is 0.2 log units, statistically insignificant considering the associated uncertainties.…”

Section: Can We Estimate the Complexation Strength Of Nickel Bicarbonmentioning

confidence: 99%

Nickel Aqueous Speciation and Solubility at Ambient Conditions: A Thermodynamic Elegy

Hummel

Curti

2003

Monatsh Chem

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This review reveals that, in contrast to the general opinion, the aqueous speciation of nickel is poorly known. Besides the fairly well established first hydrolysis constant, data are scarce and only poor estimates can be derived for higher Ni hydrolysis constants from a few solubility studies. The situation is even worse in the case of aqueous carbonate complexes. No reliable experimental study has been published so far and almost all numbers reported in thermodynamic databases are unacceptable estimates. In this review we scrutinise all these published estimates and propose expectation ranges of nickel carbonate complex stability through correlation with other known thermodynamic constants. Solubility constants for a few simple nickel solids are known or have been estimated from thermochemical data. However, none of these simple solids is of geochemical relevance at ambient conditions. Based on field evidence, classes of solids are identified which potentially govern nickel concentrations in ground and surface waters. Recent spectroscopic data indicate that magnesium clay minerals and layered double hydroxides are the most prominent candidates for nickel-bearing solids at ambient conditions.

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Section: Can We Estimate the Complexation Strength Of Nickel Bicarbonmentioning

confidence: 99%

Nickel Aqueous Speciation and Solubility at Ambient Conditions: A Thermodynamic Elegy

Hummel

Curti

2003

Monatsh Chem

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“…Data of Neuman et al, 64 Hostetler, 65 Langmuir, 66 Nakayama, 67 Jacobson and Langmuir, 63 Martynova et al, 68 Pytkowicz and Hawley, 69 Siebert and Hostetler, 70 Plummer and Busenberg, 27 Le Guyader et al, 71 Busenberg et al, 72 and Busenberg and Plummer 73 are listed. The tabulated values are not very consistent, as was also observed by Burton.…”

Section: -18 De Visscher Et Almentioning

confidence: 99%

IUPAC-NIST Solubility Data Series. 95. Alkaline Earth Carbonates in Aqueous Systems. Part 1. Introduction, Be and Mg

Visscher

Vanderdeelen

Königsberger

et al. 2012

Journal of Physical and Chemical Reference Data

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The alkaline earth carbonates are an important class of minerals. This volume compiles and critically evaluates solubility data of the alkaline earth carbonates in water and in simple aqueous electrolyte solutions. Part 1, the present paper, outlines the procedure adopted in this volume in detail, and presents the beryllium and magnesium carbonates. For the minerals magnesite (MgCO 3 ), nesquehonite (MgCO 3 Á3H 2 O), and lansfordite (MgCO 3 Á5H 2 O), a critical evaluation is presented based on curve fits to empirical and=or thermodynamic models. Useful side products of the compilation and evaluation of the data outlined in the introduction are new relationships for the Henry constant of CO 2 with Sechenov parameters, and for various equilibria in the aqueous phase including the dissociation constants of CO 2 (aq) and the stability constant of the ion pair MCO 0 3 ðaqÞ (M ¼ alkaline earth metal). Thermodynamic data of the alkaline earth carbonates consistent with two thermodynamic model variants are proposed. The model variant that describes the Mg 2þ ÀHCO À 3 ion interaction with Pitzer parameters was more consistent with the solubility data and with other thermodynamic data than the model variant that described the interaction with a stability constant.

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“…The remaining standard state properties and HKF parameters were accepted from Sverjensky and others (1997). Siebert and Hostetler (1977) for both complexes and also with the potentiometric measurements of Reardon and Langmuir (1974) for MgCO3 0 ( fig. 5).…”

mentioning

confidence: 60%

“…of MgHCO3 + based on log K values for equation (6) from Siebert and Hostetler (1977) and Stefánsson and others (2014…”

mentioning

confidence: 99%

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An internally consistent thermodynamic dataset for aqueous species in the system Ca-Mg-Na-K-Al-Si-O-H-C-Cl to 800 °C and 5 kbar

et al. 2017

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This study presents an internally consistent thermodynamic dataset for aqueous species in the system Ca-Mg-Na-K-Al-Si-O-H-C-Cl, obtained by adding species of calcium, magnesium and carbon to the core system Na-K-Al-Si-O-H-Cl (Miron and others, 2016). Critically evaluated experimental data on mineral solubility (Ca and Mg hydroxides, Ca and Mg silicates, anorthite, Ca and Mg carbonates) in water and aqueous electrolyte solutions over wide ranges in temperature and pressure were added to the database of experimental data. The complete experimental dataset was then used to simultaneously refine the standard state Gibbs energies of all aqueous ions and complexes in the framework of the revised Helgeson-Kirkham-Flowers (HKF) equation of state. The thermodynamic properties of the solubility-controlling minerals were accepted from the internally consistent dataset of Holland and Powell (1998; updated Thermocalc dataset ds55). The association equilibria of important hydroxide, chloride, carbonate and silicate complexes were critically reviewed, and their standard state properties and HKF parameters were independently derived from conductance, potentiometric and, in a few cases, solubility measurements. In a global optimization of standard Gibbs energies of aqueous species, performed with the GEMSFITS code (Miron and others, 2015), the association equilibria for aqueous complexes were always maintained. The new thermodynamic dataset reproduces all available fluid-mineral phase equilibria and mineral solubility data in the system Ca-Mg-Na-K-Al-Si-O-H-C-Cl with good accuracy over wide ranges in temperature (25 to 800°C), pressure (1 bar to 5 kbar) and composition (salt concentrations up to 5 molal). This makes it possible to perform geochemical and reactive transport modeling of processes in natural and engineered georeservoirs over wide ranges of conditions with an unprecedented level of accuracy and reliability and to address processes of fluid flow and fluid-rock interaction in the Earth's crust from a new perspective. Using the same strategy as applied in the present study, the internally consistent thermodynamic dataset can be further extended with additional major and trace elements, and the data refinement process can be repeated when new experimental data or nextgeneration equation of state or activity models for aqueous solutions become available.

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The stability of the magnesium bicarbonate ion pair from 10 degrees to 90 degrees C

Cited by 33 publications

References 0 publications

Nickel Aqueous Speciation and Solubility at Ambient Conditions: A Thermodynamic Elegy

Nickel Aqueous Speciation and Solubility at Ambient Conditions: A Thermodynamic Elegy

IUPAC-NIST Solubility Data Series. 95. Alkaline Earth Carbonates in Aqueous Systems. Part 1. Introduction, Be and Mg

An internally consistent thermodynamic dataset for aqueous species in the system Ca-Mg-Na-K-Al-Si-O-H-C-Cl to 800 °C and 5 kbar

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