Abstract
We report the modelling and experimental studies of SON68 glass dissolution in hyperalkaline solution (pH=13.7) at 30 and 70°C for more than 300days. In the experiments at 30°C and the first 100days at 70°C, the concentrations of B, Mo, alkalis and even Si showed square root of time dependence indicative of a diffusion-controlled process. At 70°C fast dissolution resumed after about 100days due to crystallization of aluminosilicates, and glass dissolution became surface reaction-controlled. For the experiment at 30°C, a simple model coupling dissolution of the glass and precipitation of secondary phases can also produce a good result for non-conservative elements, such as Ca and Al.
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