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Journal articles
Modelling the Dissolution/Precipitation of Ideal Solid Solutions
Abstract : The kinetic behaviour of an ideal solid solution is modelled by two competing reactions: the stoichiometric dissolution of the existing solid and the precipitation of the least soluble compound, i.e. that with respect to which the oversaturation of the fluid is maximum; both reaction rates are expressed as a function of the corresponding departure from equilibrium, with a pH-dependent kinetic constant. Within this ideal model, the saturation curves and the fluid evolution of a simple reacting system may be displayed conveniently in chemical potential diagrams. The simulation of a geochemical system, constituted of a glauconitic sandstone aquifer infiltrated through by a sea water enriched in carbonates, allows to analyze the impact of taking into account two ferro-magnesian solid solutions, a calcite and a chlorite, on Fe-Mg exchanges during carbonates dissolution. The model accounts well for the tendency of solid solutions to dissolve congruently before precipitation starts and drives the fluid composition towards equilibrium.
Cited literature [34 references]
https://hal-emse.ccsd.cnrs.fr/emse-00613150
Contributor : Andrée-Aimée Toucas <>
Submitted on : Wednesday, February 13, 2019 - 9:36:01 AM
Last modification on : Tuesday, April 20, 2021 - 12:12:08 PM
Long-term archiving on: : Tuesday, May 14, 2019 - 3:07:05 PM
Contributor : Andrée-Aimée Toucas <>
Submitted on : Wednesday, February 13, 2019 - 9:36:01 AM
Last modification on : Tuesday, April 20, 2021 - 12:12:08 PM
Long-term archiving on: : Tuesday, May 14, 2019 - 3:07:05 PM
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nourtier_vol60n2.pdf
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