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Publication Detail
An experimental study of magnesite dissolution rates at neutral to alkaline conditions and 150 and 200°C as a function of pH, total dissolved carbonate concentration, and chemical affinity
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Saldi GD, Schott J, Pokrovsky OS, Oelkers EH
  • Publication date:
    15/11/2010
  • Pagination:
    6344, 6356
  • Journal:
    Geochimica et Cosmochimica Acta
  • Volume:
    74
  • Issue:
    22
  • Status:
    Published
  • Print ISSN:
    0016-7037
Abstract
Steady-state magnesite dissolution rates were measured in mixed-flow reactors at 150 and 200°C and 4.6MgOH2+} stands for the concentration of hydrated magnesium centers on the magnesite surface, kMg designates a rate constant, A refers to the chemical affinity of the overall reaction, R denotes the gas constant, and T symbolizes absolute temperature. Within this model decreasing rates at far-from-equilibrium conditions (1) at constant pH with increasing temperature and (2) at constant temperature with increasing pH and ΣCO2 stem from a corresponding decrease in {>MgOH2+}. This decrease in {>MgOH2+} results from the increasing stability of the >MgCO3- and >MgOH° surface species with increasing temperature, pH and CO32- activity. The decrease in constant pH dissolution rates yields negative apparent activation energies. This behavior makes magnesite resistant to re-dissolution if formed as part of mineral carbon sequestration efforts in deep geologic formations. © 2010 Elsevier Ltd.
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