Abstract
The release of a species from a solid that is dissolving in water is of particular interest in scenarios that describe the possible release of radionuclides from glasses that contain immobilized nuclear fuel wastes. The simplest scenario is that of release from a glass that is dissolving congruently in an infinite volume of water. In a previous work, the hypothesis that the dissolution of a glass is a consequence of the diffusion of water into it was used to obtain an approximate expression for the time-dependence of the dissolution. In this present work, the approximate solution is compared with a more rigorous solution, obtained by use of the linear diffusion equation.
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