The temperature dependence of bytownite feldspar dissolution in neutral aqueous solutions of inorganic and organic ligands at low temperature (5-35 deg C)
- College of Marine Studies, University of Delaware, Lewes, DE (US)
The temperature dependence of silica release from bytownite, a Ca,Al-rich feldspar, was determined in solutions of inorganic and organic ligands at neutral pH from 5 deg C to 35 deg C. The apparent activation energy of dissolution in the inorganic (distilled water and KNO3) solutions was approximately 10 Kcal/mole. The rates and temperature dependence in acetate solutions was indistinguishable from the inorganic solutions. In contrast, both oxalate and gluconate, ligands that form strong complexes with Al in solution and presumably with Al at the mineral surface, enhanced the dissolution rates relative to the inorganic controls and had a significantly lower apparent activation energy consistent with a catalytic effect on the dissolution process.
- Research Organization:
- College of Marine Studies, University of Delaware, Lewes, DE (US)
- Sponsoring Organization:
- Subsurface Science Program, Office of Health and Environmental Research, USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- FG02-91ER61184
- OSTI ID:
- 806804
- Journal Information:
- Chemical Geology, Journal Name: Chemical Geology Journal Issue: 3-4 Vol. 167; ISSN 0009-2541
- Country of Publication:
- United States
- Language:
- English
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