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Experimental study of the effect of pH on the kinetics of montmorillonite dissolution at 25 °C |
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| Authors: | M Luisa Rozalén F Javier Huertas Patrick V Brady Susana García-Palma |
| Institution: | a Estación Experimental del Zaidín - CSIC, Department of Environmental Geochemistry, Profesor Albareda 1, 18008 Granada, Spain b Sandia National Laboratories, Albuquerque NM 87185-0754, USA c Institute of Earth Sciences Jaume Almera - CSIC. C/ Lluís Solé i Sabarís s/n. 08028 Barcelona, Spain |
| Abstract: | The effect of pH on the kinetics of smectite (K-montmorillonite) dissolution was investigated at 25 °C in batch and stirred flow-through reactors over the pH range of 1-13.5, in KNO3 solutions. Dissolution rates were obtained based on the release of Si and Al at steady-state under far from equilibrium conditions. Dissolution was non-stoichiometric between pH 5 and 10, due to adsorption/precipitation of Al. Dissolution rates computed from batch and flow-through experiments were consistent, irrespective of the Si and Al concentrations. Sample pre-treatment and the interlayer cation do not affect the steady-state dissolution rate or stoichiometry of cation release. The rate dependence on pH can be described by: |
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