Studies on Environmental Contamination by Uranium 3. Effects of Carbonate Ion on Uranium Adsorption to and Desorption from Soils

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Adsorption of uranium on soils and its desorption from uranium-adsorbed soils in the presence of carbonate ion were examined by using three kinds of soils, alluvial soil, sandy soil and volcanic ash soil. 1) The adsorption ratio of uranium for each soil was approximately 100 per cent for the mixtures of uranyl (1-50 μgU/ml) and carbonate solutions (4.3-109 μgCO3^<-->/ml). 2) In the uranium adsorbed soil (7.1-500μgU/g air-dried soil) with carbonate ion (4.3, 43.4 μg/ml), the desorption ratio of uranium for each soil was low (0.09-1.2%). The adsorption of uranium on soils and the desorption from uranium adsorbed soils with stream water were probably similar to those with carbonate solution.
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