The effect of pH, grain size, and organic ligands on biotite weathering rates
Abstract
Biotite dissolution rates were determined at 25 °C, at pH 2-6, and as a function of mineral composition, grain size, and aqueous organic ligand concentration. Rates were measured using both open- and closed-system reactors in fluids of constant ionic strength. Element release was non-stoichiometric and followed the general trend of Fe, Mg > Al > Si. Biotite surface area normalised dissolution rates (ri) in the acidic range, generated from Si release, are consistent with the empirical rate law:
- Publication:
-
Geochimica et Cosmochimica Acta
- Pub Date:
- September 2015
- DOI:
- 10.1016/j.gca.2015.04.048
- Bibcode:
- 2015GeCoA.164..127B