Anzeige
Erschienen in:
2006 | OriginalPaper | Buchkapitel
Uranium speciation in two Freital mine tailing samples: EXAFS, µ-XRD, and µ-XRF results
verfasst von : Andreas C. Scheinost, Christoph Hennig, Andrea Somogyi, Gemma Martinez-Criado, Reinhard Knappik
Erschienen in: Uranium in the Environment
Verlag: Springer Berlin Heidelberg
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
We investigated the uranium speciation in a former WISMUT mine tailing, which was buried for 30 years under mine and construction debris. Chemical extractions, EXAFS, µ-XRD, and µ-XRF reveal two major U pools. The first with a relatively high potential mobility was identified as U(VI) sorbed to layer silicates by inner-sphere complexation; the second pool is represented by the relatively insoluble U(IV) minerals pitchblende and coffinite, and by the U(VI) solids uranyl hydroxide and vanuralite. Distribution between the two pools seems to be controlled by pH. Evidence for reductive precipitation of uraninite was found.