Samples of fly ash, slag and boiler scale containing elevated amounts of uranium or lead (Pb) from several coal-fired power stations in the Czech Republic were collected for an assessment of their dissolution parameters - the dissolution rates and their respective fractions in vitro. The dissolution data were fitted either by a biexponential model or by a triexponential model. The uranium U and U in the fly ash sample are classified as M-type. Similarly, type M could be attributed for most of the materials containing Pb. A complementary measurement of the activity concentrations of Pb in relation to the grain size confirmed that the radionuclide is deposited mainly in fine particles (<25 μm).
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