Identification of the Non-Pertechnetate Species in Hanford Waste Tanks, Tc(I)−Carbonyl Complexes
Environmental Science & Technology2003Vol. 38(1), pp. 229–233
Citations Over TimeTop 19% of 2003 papers
Abstract
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)3(gluconate)2-. This is further supported by EXAFS and 99Tc−NMR studies in nonradioactive simulants of these tank wastes.
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