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Publication Detail
An experimental study of illite dissolution kinetics as a function of ph from 1.4 to 12.4 and temperature from 5 to 50°C
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Köhler SJ, Dufaud F, Oelkers EH
  • Publication date:
    01/10/2003
  • Pagination:
    3583, 3594
  • Journal:
    Geochimica et Cosmochimica Acta
  • Volume:
    67
  • Issue:
    19
  • Status:
    Published
  • Print ISSN:
    0016-7037
Abstract
Dissolution rates of natural illite (Illite du Puy) were measured from Si release rates during closed system experiments at pH ranging from 1.4 to 12.4 and temperatures ranging from 5 to 50°C. Experiments performed at 4pH>11. Si release rate decreased with time during all experiments; for those experiments performed at 4>pH>11 this observation can be attributed to either 1) changing reactive surface area; 2) the effect of initial fine particle dissolution; or 3) a negative order of the illite dissolution reaction with respect to aqueous Al and/or Si. Measured dissolution rates exhibited a typical variation with pH; rates decrease with increasing pH at acid conditions, minimize at near to neutral pH and increase with increasing pH at basic conditions. An empirical expression describing rates obtained in the present study is given by r = AH exp(-EAH+/RT) a0.6H+ + AH2O exp(-EAH2O/RT) + AOH exp(-EAOH-/RT) a0.6OH- where AH, AH20 and AOH equal 2.2 × 10-4, 2.5 × 10-13 and 0.27 mol m-2 s-1, EAi stands for activation energies equal to 46, 14 and 67 kJ mol-1, R designates the gas constant, T refers to absolute temperature, and ai signifies the activity of the subscripted aqueous species. © 2003 Elsevier Ltd.
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