Abstract
Highly dispersed vaterite, a metastable modification of CaCO3, can efficiently sorb 90Sr2+ and 90Y3+ ions from neutral aqueous solutions. The sorption proceeds in two stages. The first, rapid, stage (15-20 min) consists in adsorption of the radionuclide ions at active surface sites. The second, slow, stage (3-4 days) consists in irreversible capture of the radionuclides in the bulk upon transition of vaterite to calcite by the recrystallization mechanism.
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