| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4707081 | Geochimica et Cosmochimica Acta | 2005 | 16 Pages |
Abstract
Under alkaline conditions, results from XRD profile modelling and from near infrared diffuse reflectance spectroscopy (NIR-DRS) clearly demonstrate that there is no CaOH+-for-Ca2+ exchange at high pH. The apparent increase in Ca sorption in smectite interlayers with increasing pH is thus probably related to the precipitation of Calcium-Silicate-Hydrate (CSH) phases, which also accounts for the decrease in Si concentration under high-pH conditions. This precipitation is thermodynamically favoured.
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Authors
Eric Ferrage, Christophe Tournassat, Emmanuel Rinnert, Bruno Lanson,