Investigating the Release of Co-precipitated Uranium from Iron Oxides
Preprint2006
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, DOI: 10.23689/fidgeo-2369.
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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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ZugriffsstatistikSammlung:
- Geologie [930]