- AutorIn
- Clement N’zau Umba-di-Mbudi
- Titel
- Understanding sorption mechanisms of uranium onto elemental iron, minerals and Shewanella putrefaciens surfaces in the presence of arsenic
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:105-qucosa-27425
- Datum der Einreichung
- 04.06.2009
- Datum der Verteidigung
- 11.12.2009
- Abstract (EN)
- The concomitant occurrence and reported discrepant behavior of uranium and arsenic in water bodies is a major health and environmental concern. This study combined batch and column experiments, hydrogeochemical simulations and XAFS spectroscopy to uncover the exchange mechanisms governing uranium fate between water and scrap metallic iron, minerals and Shewanella putrefaciens surfaces in the presence of arsenic. The main results suggest that both water chemistry and the solid phase composition influence uranium fate in the presence of arsenic. The importance of uranyl-arsenate species as a major control of uranium behavior in the presence of arsenic is shown. The toxicity of arsenic and the presence of nitrate are interpreted as limiting factors of the enzymatic reduction of both toxins. Besides, XANES fingerprinting and EXAFS modeling have confirmed precipitation/co-precipitation of uranyl-arsenates as a major mechanism controlling uranium behavior in the presence of arsenic.
- Freie Schlagwörter (DE)
- Uran, Arsen, Sorption, nullwertiges Eisen, Mineralien, Shewanella putrefaciens, Modellierung, XANES, EXAFS
- Freie Schlagwörter (EN)
- uranium, arsenic, sorption, scrap metallic iron, minerals, Shewanella putrefaciens, modeling, XANES, EXAFS
- Klassifikation (DDC)
- 550
- Klassifikation (RVK)
- AR 22500, UQ 6400, VK 7778, VW 8078, VN 9207
- GutachterIn
- Prof. Dr. rer. nat. habil Broder Merkel
- Prof. Dr.-Ing. habil. Philippe Behra
- BetreuerIn
- Prof. Dr. rer. nat. habil Broder Merkel
- Verlag
- TU Bergakademie Freiberg, Freiberg
- URN Qucosa
- urn:nbn:de:bsz:105-qucosa-27425
- Veröffentlichungsdatum Qucosa
- 19.03.2010
- Dokumenttyp
- Dissertation
- Sprache des Dokumentes
- Englisch