[en] The sorption and desorption behaviour of uranium in various fluvial sands of domestic origin were investigated by continual dynamic experiments. U(VI) was sorbed from a 10^-4M solution of uranyl nitrate in demineralized water at ca 0.3 cm³/min flow rate. Desorption was made first with demineralized water and then with 10^-2M solution of sodium carbonate in demineralized water. The retardation coefficients (R) were determined via breakthrough curves (BTC) and displacement curves (DPC). Based on the R values and on the observed density and porosity, the distribution coefficients (K_d) were calculated for the sorption and desorption of uranium in dynamic conditions. The U(VI) sorption capacity of sands and the amount of desorbed uranium were calculated. The calculations proved the reversible character of sorption of U(VI), which also implies that uranium retained in sands can be easily mobilized by groundwater giving even slight alkaline reaction