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Publication Detail
An experimental study of dolomite dissolution rates at 80 °C as a function of chemical affinity and solution composition
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Gautelier M, Schott J, Oelkers EH
  • Publication date:
    15/08/2007
  • Pagination:
    509, 517
  • Journal:
    Chemical Geology
  • Volume:
    242
  • Issue:
    3-4
  • Status:
    Published
  • Print ISSN:
    0009-2541
Abstract
Steady-state dissolution rates of Haute Vallée de l'Aude dolomite were measured as a function of chemical affinity and aqueous solution composition in mixed-flow reactors at 80 °C. Experiments were performed in HCl-NaHCO3 bearing aqueous solutions with in-situ pH ranging from 6.36 to 7.17. Rates are found to be a strong function of aqueous carbonate concentrations at far-from-equilibrium conditions. Measured rates can be described using the dissolution mechanism of Pokrovsky and Schott [Pokrovsky, O.S., Schott, J., 2001. Kinetics and mechanism of dolomite dissolution in neutral to alkaline solutions revisited. Am. J. Sci., 301, 597-626] where rates are controlled by the detachment of the > MgOH2+ species at the dolomite surface. Within this mechanism, dolomite dissolution rates can be described using{Mathematical expression}where r refers to the overall BET surface area normalized dolomite dissolution rate at both near and far-from-equilibrium conditions, kMg+ designates a rate constant equal to 4.0 × 10- 12 mol cm- 2 s- 1, KCa* and KCO3* denote equilibrium constants equal to 3.5 × 10- 5 and 4.5 × 10- 5, respectively, ai refers to the activity of the subscripted aqueous species, A corresponds to the chemical affinity of the dissolving dolomite, R represents the gas constant, T symbolizes absolute temperature and n designates a stoichiometric coefficient equal to 1.9. © 2007 Elsevier B.V. All rights reserved.
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