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Investigating the Release of Co-precipitated Uranium from Iron Oxides

Noubactep, C.ORCIDiD
Schöner, A.
Dienemann, H.
Sauter, M.
Preprint
2006
DOI: https://doi.org/10.23689/fidgeo-1801
Noubactep, C.; Schöner, A.; Dienemann, H.; Sauter, M., 2006: Investigating the Release of Co-precipitated Uranium from Iron Oxides. In: Noubactep, C.; Schöner, A.; Dienemann, H.; Sauter, M. (2006): Investigating the Release of Co-precipitated Uranium from Iron Oxides, 21 - 27, DOI 10.23689/fidgeo-1801.
 
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  • Abstract
The removal of uranium (VI) in zerovalent iron permeable reactive barriers and wetlands can be explained by its association with iron oxides. The long term stability of this immobilized U is yet to be addressed. The presented study investigates the remobilization of U(VI) from iron oxides via diverse reaction pathways (acidification, reduction, complex formation) in the laboratory. Prior uranium co-precipitation experiments were conducted under various conditions. The addition of various amounts of a pH-shifting agent (pyrite), an iron complexing agent (EDTA) or an iron (III) reduction agent (TiCl3) yielded in uranium remobilisation to concentrations above the US EPA maximum allowed contaminant level (MCL = 30 mg/L). This study demonstrates that U(VI) release in nature will strongly depend on the conditions and the mechanism of its fixation by geological materials.
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