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在表生条件下铀的迁移能力,取决于它的化学性质,这些性质中比较重要的是四价铀的活动性弱,六价铀的活动性强。六价铀迁移能力强是由于它形成较大的铀酰阳离子,铀酰离子在酸性和弱酸性溶液中活动性强,并且所形成的碳酸盐络离子在碱性和弱碱性介质中稳定。由于铀的这些性质,只有溶液具有相当高的氧化电位时它才能以六价铀状态进行迁移,而在局
The uranium migration ability under superficial conditions depends on its chemical properties. The more important of these properties is that the activity of uranium is weak and the activity of hexavalent uranium is strong. Hexavalent uranium is highly migratory because it forms larger uranyl cations, uranyl ions are highly mobile in acidic and weakly acidic solutions, and the carbonate complex formed is stable in both basic and weakly alkaline media . Because of these properties of uranium, it can only migrate as hexavalent uranium if the solution has a fairly high oxidation potential, whereas in the presence of