Can we predict uranium bioavailability based on soil parameters? Part 2: Soil solution uranium concentration is not a good bioavailability index

A surface structural model for ferrihydrite II: Adsorption of uranyl and carbonate

“…This species is bioavailable ( Vandenhove et al, 2007). In solution, UO 2 2+ may hydrolyze and in contact with CO 2 , uranyl forms a variety of carbonate complexes (Guillaumont et al, 2003).…”

“…The migration depends on the distribution of uranium over the mobile and immobile phases. Uranium in the mobile phase may interact with mineral phases and organic matter (Davis et al, 2004;Vandenhove et al, 2007). In the case of adsorption, the distribution over phases will depend on the type of surface complexes formed at the given solution chemistry.…”

Method of diffusive gradients in thin films (DGT) compared with other soil testing methods to predict phytoavailability of uranium and selected heavy metals from multipolluted soils

“…Mobility and bioavailability of contaminants are among others affected by pollution type and origin, the element's physicochemical form and type and the physicochemical characteristics of the environment itself. Previous efforts to unravel the relation between 'available' forms of U and availability for plant uptake have not been very promising [1][2][3][4][5]. A new approach to assess metal bioavailability in soils, the diffusive gradient in thin film (DGT) technique, was developed for sampling an available fraction of heavy metals in soils [6].…”

Bio-monitoring for uranium using stream-side terrestrial plants and macrophytes

“…16,17 Uranium can bond strongly to common groundwater species of CO 3 2-and Ca 2+ to form stable dissolved complexes, which can compete with mineral surfaces, thus maintaining relatively high mobility of U. 1616,1717 ,18 Desired immobilization of U within such a contaminated zone can be further confounded by the inhibition of microbial reduction of U(VI) to U(IV) in the presence of Ca.…”