The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution

Christoph Hennig, A. Ikeda 1 , K. Schmeide 2 , Vinzenz Brendler 3 , Henry Moll 4 , S. Tsushima 5 , A. C. Scheinost 6 , Suntharalingam Skanthakumar 7 , R. Wilson 8 , L. Soderholm 9 , K. Servaes 10 ,  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

Abstract

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.

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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.

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