Interaction of uranium(VI) and neptunium(V) with Äspö diorite under anoxic conditions

Schmeide, Katja; Gürtler, Sylvia; Bok, Frank; Brendler, Vinzenz

Interaction of uranium(VI) and neptunium(V) with Äspö diorite under anoxic conditions

Schmeide, K.; Gürtler, S.; Bok, F.; Brendler, V.

The interaction of uranium(VI) and neptunium(V) with diorite obtained from Äspö Hard Rock Laboratory (HRL, Sweden) has been studied by means of batch sorption experiments under anoxic conditions (N₂) as a function of contact time (5 to 108 d) applying a synthetic Äspö groundwater (pH 7.8, I = 0.18 M) as background electrolyte. In the case of uranium(VI), sorption isotherms have been recorded by varying the total uranium(VI) concentration between 3•10⁻⁹ and 2•10⁻⁵ M. Distribution coefficients, K_d values, were determined. Desorption experiments have been performed using synthetic Äspö groundwater. For redox speciation of actinides in sample solution or desorbed from the diorite, solvent extraction has been applied.

Keywords: sorption; reduction; U(VI); Np(V); Np(IV)

Lecture (Conference)
Final Workshop of the Project "Crystalline rock retention processes" (CROCK), 14.-16.05.2013, Karlsruhe, Germany
Poster
Final Workshop of the Project "Crystalline rock retention processes" (CROCK), 14.-16.05.2013, Karlsruhe, Germany
Contribution to proceedings
Final Workshop of the Project "Crystalline Rock Retention Processes" (CROCK), 14.-16.05.2013, Karlsruhe, Germany
Final Workshop Proceedings of the Collaborative Project "Crystalline Rock Retention Processes" (7th EC FP CP CROCK), KIT Scientific Reports 7656, Karlsruhe: KIT Scientific Publishing, 211-223 (2014)

Permalink: https://www.hzdr.de/publications/Publ-18809