Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationReduction of Se(IV) with Boom Clay: XAS solid phase speciation
Breynaert, E.; Scheinost, A. C.; Dom, D.; Rossberg, A.; Vancluysen, J.; Gobechiya, E.; Kirschhock, C. E. A.; Maes, A.
Abstract
The geochemical fate of selenium is of key importance for todays society due to its role as a highly toxic essential micronutrient and as a significant component of High Level Radioactive Waste (HLRW) originating from the operation of nuclear reactors. Understanding and prediction of the long-term behavior of Se in natural environments requires identification of the in situ speciation of selenium. This article describes an XAS-based investigation into the solid phase speciation of Se upon interaction of Se(IV) with Boom Clay, a reducing, complex sediment selected as model host rock for clay-based deep geological disposal of HLRW in Belgium and Europe. Using a combination of long-term batch sorption experiments, linear combination XANES analysis and ITFA-based EXAFS analysis allowed for the first time to identify Se0 as the dominant solid phase speciation of Se in Boom Clay systems equilibrated with Se(IV).
Keywords: selenium; XAFS
Involved research facilities
- Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265
Related publications
- DOI: 10.1107/S1600577520014265 is cited by this (Id 13889) publication
- Environmental Science & Technology 44(2010), 6649-6655
Permalink: https://www.hzdr.de/publications/Publ-13889