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Speciation of Technetium in Sulfuric Acid/Hydrogen Sulfide Solutions

Abstract : The reaction between TcVII and H2S(g) in 12 M H2SO4 has been studied. This reaction produced a black solid and a brown supernate. The solid was analyzed by energy dispersive X-ray (EDX) and X-ray absorption fine structure (XAFS) spectroscopy and the results were consistent with the presence of Tc2S7. The speciation of technetium in the supernate was performed by UV/Visible and XAFS spectroscopy. Experiments showed that in 12 M H2SO4 an intermediate TcV sulfate complex was formed. Analysis indicated that the final complex present in solution was a polymeric species with a Tc-O-Tc core coordinated to sulfate ligands. Density Functional Theory (DFT) calculations showed that the proposed complexes were stable and that the theoretical structure was in good agreement with XAFS data.
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http://hal.in2p3.fr/in2p3-00993356
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Submitted on : Tuesday, May 20, 2014 - 10:47:34 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:32 PM

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M. Ferrier, J. Roques, F. Poineau, A. P. Sattelberger, J. Unger, et al.. Speciation of Technetium in Sulfuric Acid/Hydrogen Sulfide Solutions. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2014, 2014, pp.2046-2052. ⟨10.1002/ejic.201301410⟩. ⟨in2p3-00993356⟩

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