A Pitzer Parametrization To Predict Solution Properties and Salt Solubility in the H–Na–K–Ca–Mg–NO 3 –H 2 O System at 298.15 K

Adeline Lach; Laurent André; Sylvain Guignot; Christomir Christov; Pierre Henocq; Arnault Lassin

doi:10.1021/acs.jced.7b00953

Journal articles

A Pitzer Parametrization To Predict Solution Properties and Salt Solubility in the H–Na–K–Ca–Mg–NO 3 –H 2 O System at 298.15 K

Adeline Lach ¹ Laurent André ^{1, 2, 3} Sylvain Guignot ¹ Christomir Christov ⁴ Pierre Henocq ⁵ Arnault Lassin ¹

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

2 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327

3 Milieux Poreux - UMR7327

ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327

4 konstantin Preslavsky University

5 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs

Abstract : A new set of Pitzer interaction parameters is proposed to describe the excess properties of the H–Na–K–Ca–Mg–NO3–H2O system at 298.15 K. From these parameters we reproduce the osmotic coefficient, mean activity coefficients, and density for the binary systems, and also salt solubility in the ternary subsystems. The binary interaction parameters are either selected from the literature or redetermined in this study. In the case of KNO3–H2O and HNO3–H2O binary systems, partial electrolyte dissociation has to be taken into account to represent accurately all the experimental data up to very high concentrations. Then solubility data of salts in the corresponding ternary systems are used to determine the ternary interaction parameters and the solubility products of the double salts. As KNO3 and HNO3 are partially dissociated, we have determined new interaction parameters involving neutral species (for instance ηKNO3/Na+/H+ or μHNO3/KNO3/Na+) to draw the phase diagram of quaternary systems Na–K–H–NO3. To complement the study, we also propose a set of volumetric Pitzer interaction parameters for all the binary systems and for the H–K–NO3 ternary system, so solution density can be computed at 298.15 K.

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Journal articles

Domain :

Sciences of the Universe [physics]

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https://hal-insu.archives-ouvertes.fr/insu-01784254
Contributor : Nathalie Pothier <>
Submitted on : Thursday, May 3, 2018 - 11:10:09 AM
Last modification on : Wednesday, October 14, 2020 - 4:01:45 AM

A Pitzer Parametrization To Predict Solution Properties and Salt Solubility in the H–Na–K–Ca–Mg–NO 3 –H 2 O System at 298.15 K

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A Pitzer Parametrization To Predict Solution Properties and Salt Solubility in the H–Na–K–Ca–Mg–NO 3 –H 2 O System at 298.15 K

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