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2846812 
Journal Article 
Speciation of technetium peroxo complexes in sulfuric acid revisited 
Poineau, F; German, KE; Burton-Pye, BP; Weck, PF; Kim, E; Kriyzhovets, O; Safonov, A; Ilin, V; Francesconi, LC; Sattelberger, AP; Czerwinski, KR 
2015 
Yes 
Journal of Radioanalytical and Nuclear Chemistry
ISSN: 0236-5731
EISSN: 1588-2780 
303 
2 
1163-1167 
WOS:000348192200017 
The reaction of Tc(+7) with H2O2 has been studied in H2SO4 and the speciation of technetium performed by UV-visible and 99-Tc NMR spectroscopy. UV-visible measurements show that for H2SO4 a parts per thousand yen 9 M and H2O2 = 0.17 M, TcO3(OH)(H2O)(2) reacts immediately and blue solutions are obtained, while no reaction occurs for H2SO4 < 9 M. The spectra of the blue solutions exhibit bands centered around 520 and 650 nm which are attributed to Tc(+7) peroxo species. Studies in 6 M H2SO4 show that TcO4 (-) begins to react for H2O2 = 2.12 M and red solutions are obtained. The UV-visible spectra of the red species are identical to the one obtained from the reaction of TcO4 (-) with H2O2 in HNO3 and consistent with the presence of TcO(O-2)(2)(H2O)(OH). The 99-Tc NMR spectrum of the red solution exhibits a broad signal centered at +5.5 ppm vs TcO4 (-) and is consistent with the presence of a low symmetry Tc(+7) molecule. 
Technetium; Peroxo complexes; Speciation; Sulfuric acid