Albite feldspar dissolution kinetics as a function of the Gibbs free energy at high pCO_2

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dc.creatorHellmann, Roland
dc.creatorDaval, Damien
dc.creatorTisserand, Delphine
dc.creatorRenard, François
dc.date2008-01-03
dc.date.accessioned2026-07-07T08:52:22Z
dc.date.available2026-07-07T08:52:22Z
dc.descriptionWe are currently measuring the dissolution kinetics of albite feldspar at 100 deg C in the presence of high levels of dissolved CO_2 (pCO_2 = 9 MPa) as a function of the saturation state of the feldspar (Gibbs free energy of reaction, ΔG). The experiments are conducted using a flow through reactor, thereby allowing the dissolution reactions to occur at a fixed pH and at constant, but variable saturation states. Preliminary results indicate that at far-from-equilibrium conditions, the dissolution kinetics of albite are defined by a rate plateau, with R \approx 5.0 x 10^{-10} mol m^{-2} s^{-1} at -70 < ΔG < -40 kJ mol^{-1}. At ΔG > -40 kJ mol^{-1}, the rates decrease sharply, revealing a strong inverse relation between the dissolution rate and free energy. Based on the experiments carried out to date, the dissolution rate-free energy data correspond to a highly non-linear and sigmoidal relation, in accord with recent studies.
dc.identifierhttps://arxiv.org/abs/0801.0548
dc.identifierhttp://arxiv.org/abs/0801.0548
dc.identifierWater-rock Interaction, Taylor and Francis (Ed.) (2007) 591-595
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/145258
dc.subjectGeophysics
dc.titleAlbite feldspar dissolution kinetics as a function of the Gibbs free energy at high pCO_2
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