Identification of the non-pertechnetate species in Hanford waste tanks, Tc(I) carbonyl complexes

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Immobilization of the high-level nuclear waste stored at the Hanford Reservation has been complicated by the presence of soluble, lower-valent technetium species. Previous work by Schroeder and Blanchard has shown that these species cannot be removed by ion-exchange and are difficult to oxidize. The Tc-K edge XANES spectra of the species in Tanks SY-101 and SY-103 were reported by Blanchard, but they could not be assigned to any known technetium complex. We report that the XANES spectra are most likely those of Tc(I) carbonyl species, especially fac-Tc(CO){sub 3}(gluconate){sup 2-}. This is further supported by EXAFS and {sup 99}Tc-NMR studies in ... continued below

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Lukens, Wayne W.; Shuh, David K.; Schroeder, Norman C. & Ashley, Kenneth R. October 16, 2003.

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Immobilization of the high-level nuclear waste stored at the Hanford Reservation has been complicated by the presence of soluble, lower-valent technetium species. Previous work by Schroeder and Blanchard has shown that these species cannot be removed by ion-exchange and are difficult to oxidize. The Tc-K edge XANES spectra of the species in Tanks SY-101 and SY-103 were reported by Blanchard, but they could not be assigned to any known technetium complex. We report that the XANES spectra are most likely those of Tc(I) carbonyl species, especially fac-Tc(CO){sub 3}(gluconate){sup 2-}. This is further supported by EXAFS and {sup 99}Tc-NMR studies in nonradioactive simulants of these tank wastes.

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  • Journal Name: Environmental Science and Technology; Journal Volume: 38; Journal Issue: 1; Other Information: Journal Publication Date: 01/01/2004

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  • Report No.: LBNL--53556
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 823079
  • Archival Resource Key: ark:/67531/metadc782186

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 16, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 1:11 p.m.

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Lukens, Wayne W.; Shuh, David K.; Schroeder, Norman C. & Ashley, Kenneth R. Identification of the non-pertechnetate species in Hanford waste tanks, Tc(I) carbonyl complexes, article, October 16, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc782186/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.