# Albite feldspar dissolution kinetics as a function of the Gibbs free energy at high pCO\_2

Source: [Albite feldspar dissolution kinetics as a function of the Gibbs free energy at high pCO\_2](<https://www.sota2.com/research/paper/68fa212f7a2b558e29335a75>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:52:12.994Z

Authors: Roland Hellmann, Damien Daval, Delphine Tisserand, Fran\\c{c}ois Renard

Published: 2008-01-03T15:29:03.000Z

## Abstract

We 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, \\Delta G). 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 \< \\Delta G \< -40 kJ mol^{-1}. At \\Delta G \> -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.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0801.0548>)

[PDF](<https://arxiv.org/pdf/0801.0548.pdf>)