Kinetic model for the short-term dissolution of a rhyolitic glass
Aqueous dissolution experiments with the vitric phase of a rhyolitic tuff were performed at 25??C and constant pH in the range 4.5-7.5. Results suggest interchange of aqueous hydrogen ions for cations situated both on the surface and within the glass. At time intervals from 24 to 900 hr., dissolution kinetics are controlled by ion transport to and from sites within the glass. Experimental data indicate that parabolic diffusion rate of a chemical species from the solid is a nonlinear function of its aqueous concentration. A numerical solution to Fick's second law is presented for diffusion of sodium, which relates it's aqueous concentration to it's concentration on glass surface, by a Freundlich adsorption isotherm. The pH influence on sodium diffusion in the model can be accounted for by use of a pH-dependent diffusion coefficient and a pH-independent adsorption isotherm. ?? 1980.
Citation Information
Publication Year | 1980 |
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Title | Kinetic model for the short-term dissolution of a rhyolitic glass |
DOI | 10.1016/0009-2541(80)90038-8 |
Authors | A. F. White, H. C. Claassen |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Chemical Geology |
Index ID | 70012126 |
Record Source | USGS Publications Warehouse |