The effect of fluoride on the dissolution rates of natural glasses at pH 4 and 25°C |
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| Authors: | Domenik Wolff-Boenisch Sigurdur R Gislason |
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| Institution: | 1 Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
2 Géochimie: Transferts et Mécanismes, CNRS/UMR 5563-Université Paul Sabatier, 38 rue des Trente-six Ponts, 31400 Toulouse, France |
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| Abstract: | Far-from-equilibrium, steady-state dissolution rates at pH 4 of a suite of natural glasses, ranging from basaltic to rhyolitic in composition, have been determined as a function of aqueous fluoride concentrations up to 1.8 × 10−4 mol/kg in mixed-flow reactors. Dissolution rates of each of these glasses increase monotonically with increasing aqueous fluoride concentration. Measured dissolution rates are found to be consistent with both the Furrer and Stumm (1986) surface coordination model and the Oelkers (2001) multi-oxide dissolution model. Application of the latter model yields the following equation that can describe all measured rates as a function of both glass and aqueous solution composition:
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