A thermodynamic model for solution behavior and solid-liquid equilibrium in Na-K-Mg-Ca-Al(III)-Fe(III)-Cr(III)-Cl-H2O system from low to very high concentration at 25°C - BRGM - Bureau de recherches géologiques et minières Accéder directement au contenu
Article Dans Une Revue Acta Scientifica Naturalis Année : 2019

A thermodynamic model for solution behavior and solid-liquid equilibrium in Na-K-Mg-Ca-Al(III)-Fe(III)-Cr(III)-Cl-H2O system from low to very high concentration at 25°C

Résumé

In this study we evaluated new mixing (θ and ψ) Pitzer parameters, and developed models for solution behavior and solid liquid equilibria for the following mixed systems: 1) KCl The solubility modeling approach, implemented to the Pitzer specific interaction equations is employed. The values of the binary parameters for the binary subsystems needed here to parameterize models for mixed systems are taken from our previous studies. Mixing solution parameters are evaluated in this study using activity (when available) and solubility data. Following an approach in our previous modeling studies on M(III) chloride and sulfate systems, in this work we accept that complex Al(III), Cr(III), and Fe(III) aqueous species do not exist in solutions. We test the new models by comparing model predictions with experimental data (activity data for unsaturated solutions and solubility data in ternary systems). The agreement between model predictions and experimental data is very good. Combining present parameterization, with our M(III) models developed previously we fully complete our at 25°C model for the 8 th component system Na-K-Mg-Ca-Al(III)-Cr(III)-Fe(III)-Cl-H2O. The resulting model calculates solubilities and solution activities to high solution concentration within experimental uncertainty. Limitations of the model due to data insufficiencies are discussed. The resulting parameterization was developed for the Pitzer formalism based PHREEQC database.

Domaines

Géochimie
Fichier principal
Vignette du fichier
2019-Andre_et_al-ASN.pdf (523.69 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02145943 , version 1 (07-06-2019)

Identifiants

Citer

Laurent André, Christomir Christov, Arnault Lassin, Mohamed Azaroual. A thermodynamic model for solution behavior and solid-liquid equilibrium in Na-K-Mg-Ca-Al(III)-Fe(III)-Cr(III)-Cl-H2O system from low to very high concentration at 25°C. Acta Scientifica Naturalis, 2019, 6 (1), pp.26-36. ⟨10.2478/asn-2019-0004⟩. ⟨hal-02145943⟩
102 Consultations
254 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More