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

Königsberger, Erich; Königsberger, Lan-Chi; Gamsjäger, Heinz

doi:10.1016/s0016-7037(99)00238-0

Cited by 246 publications

(173 citation statements)

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“…Harvie et al 31 assumed an activity coefficient of unity for MgCO 0 3 . He and Morse 29 followed this example for the sake of consistency because they used some of the parameters of Harvie et al 31 Königsberger et al 79 did not introduce an ionic strength dependence other than a Pitzer parameter for the MgCO 0 3 ÀClO À 4 ion-neutral interaction. Given the inconsistency of the data, it seems appropriate to follow the example of He and Morse.…”

Section: -18 De Visscher Et Almentioning

confidence: 99%

“…1.3.2.4). A similar approach, but with a k (ion-neutral) interaction parameter, was used by Königsberger et al 78,79 for the interaction between MgCO 0 3 and ClO À 4 . The interpretation of solubility data in terms of ion pairing with bicarbonate and carbonate has been in debate since Langmuir's 1968 paper.…”

Section: -21 Iupac-nist Solubility Data Series 95-1mentioning

confidence: 99%

“…96 Königsberger et al 79 largely followed the approach of Harvie et al, 31 but assumed ion pairing between Ca 2þ and OH À (stability constant about 12 at 25 C; lg K ¼ 1.078) along with the Ca(OH) 2 Pitzer parameters of Harvie et al, 31 who assumed no such ion pairing in their model. Unlike Harvie et al, 31 Königsberger et al 79 needed this inclusion of a stability constant to correctly predict portlandite (Ca(OH) 2 ) solubility. They used a value consistent with Harvie et al 31 for the magnesium ion pair (lg K ¼ 2.215).…”

Section: -21 Iupac-nist Solubility Data Series 95-1mentioning

confidence: 99%

“…Pitzer parameters for this class of interactions are given in Table 12. We followed Königsberger et al 79 in including both a stability constant and Pitzer parameters in the model, except for MgOH þ , which has a sufficiently high equilibrium constant to replace Pitzer parameters; we assumed b (2) ¼ 0 for all 1-2 ion pairs. For Sr(OH) 2 , we assumed Pitzer parameters that are the average of the parameters for Ca and Ba.…”

Section: -21 Iupac-nist Solubility Data Series 95-1mentioning

confidence: 99%

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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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Section: -18 De Visscher Et Almentioning

confidence: 99%

Section: -21 Iupac-nist Solubility Data Series 95-1mentioning

confidence: 99%

Section: -21 Iupac-nist Solubility Data Series 95-1mentioning

confidence: 99%

Section: -21 Iupac-nist Solubility Data Series 95-1mentioning

confidence: 99%

See 2 more Smart Citations

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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“…Seeding also stimulates post-sparging hydromagnesite growth. Previous studies (e.g., Königsberger et al, 1999;Hopkinson et al, 2012) indicate that in all four experiments the system would have been simultaneously supersaturated with nesquehonite and…”

Section: Hydromagnesite Seedingmentioning

confidence: 67%

Carbonate mineral paragenesis and reaction kinetics in the system MgO–CaO–CO 2 –H 2 O in presence of chloride or nitrate ions at near surface ambient temperatures

Kristová

Hopkinson

Rutt

et al. 2014

Applied Geochemistry

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The Crystallization of Amorphous Calcium Carbonate is Kinetically Governed by Ion Impurities and Water

et al. 2018

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Many organisms use amorphous calcium carbonate (ACC) and control its stability by various additives and water; however, the underlying mechanisms are yet unclear. Here, the effect of water and inorganic additives commonly found in biology on the dynamics of the structure of ACC during crystallization and on the energetics of this process is studied. Total X‐ray scattering and pair distribution function analysis show that the short‐ and medium‐range order of all studied ACC samples are similar; however, the use of in situ methodologies allow the observation of small structural modifications that are otherwise easily overlooked. Isothermal calorimetric coupled with microgravimetric measurements show that the presence of Mg2+ and of PO4 3− in ACC retards the crystallization whereas increased water content accelerates the transformation. The enthalpy of ACC with respect to calcite appears, however, independent of the additive concentration but decreases with water content. Surprisingly, the enthalpic contribution of water is compensated for by an equal and opposite entropic term leading to a net independence of ACC thermodynamic stability on its hydration level. Together, these results point toward a kinetic stabilization effect of inorganic additives and water, and may contribute to the understanding of the biological control of mineral stability.

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

Cited by 246 publications

References 74 publications

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

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

Carbonate mineral paragenesis and reaction kinetics in the system MgO–CaO–CO 2 –H 2 O in presence of chloride or nitrate ions at near surface ambient temperatures

The Crystallization of Amorphous Calcium Carbonate is Kinetically Governed by Ion Impurities and Water

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