The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution
Christoph Hennig, A. Ikeda
, K. Schmeide
, Vinzenz Brendler
, Henry Moll
, S. Tsushima
, A. C. Scheinost
, Suntharalingam Skanthakumar
, R. Wilson
, L. Soderholm
, K. Servaes
, and et al.
1 Forschungszentrum Dresden-Rossendorf, Institute of Radiochemistry, Dresden
2 Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, Dresden, Deutschland
3 Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, Dresden, Deutschland
4 Forschungszentrum Dresden-Rossendorf e.V., Institut für Radiochemie, Dresden
5 Nagoya University, Department of Materials, Physics, and Energy Engin, Nagoya, Japan
6 Forschungszentrum Dresden-Rossendorf, Institute of Radiochemistry, Dresden
7 Argonne National Laboratory, Chemistry Division, Argonne, Illinois, U.S.A.
8 Argonne National Laboratory, Chemistry Division, Argonne, Illinois, U.S.A.
9 Argonne National Laboratory, Chemical Sciences and Engineering Division, Argonne, Illinois, U.S.A.
10 Department of Chemistry, Katholieke Universiteit Leuven, Leuven, Belgien
The coordination of U(VI) sulfate complexes has been investigated by uranium LIII-edge EXAFS and HEXS measurements with the aim to distinguish monodentate and bidentate coordinated sulfate in aqueous solution. UV-vis absorption spectroscopy has been used to differentiate the species and to determine the species distribution as a function of the [SO42−]/[UO22+] ratio. A monodentate coordination prevails in solutions with [SO42−]/[UO22+] ratio of 1, where UO2SO4 is the dominant species. Besides the dominating monodentate sulfate a small amount of bidentate sulfate could be observed, indicating that two isomers may exist for UO2SO4. With increasing [SO42−]/[UO22+] ratio the UO2(SO4)22− species becomes the main species. The uranium atom of this species is coordinated by two bidentate sulfate groups.
Radiochimica Acta publishes original papers, review articles, and “rapid communications” (short articles of a more timely interest) on all chemical aspects of nuclear science and technology. The journal is geared toward scientists who are actively engaged in research work.