Non-Pertechnetate Technetium Sensor Research and Development

Bryan, Samuel A.¹  Crawford, Amanda D.¹  Heineman, William R.²  Rapko, Bri 

[1] Pacific Northwest National Lab. (PNNL), Richland, WA (United States);Univ. of Cincinnati, OH (United States)

关键词: Non-pertechnetate;    technetium;    spectroelectrochemistry;   

DOI  :  10.2172/1168931
RP-ID  :  PNNL--23655
RP-ID  :  EMSP-RPT-025,Rev.0
PID  :  OSTI ID: 1168931
Others  :  Other: EY4049110

美国|英语

来源: SciTech Connect

【 摘 要 】

There remain several significant uncertainties in the understanding and modeling of the fate and speciation of ⁹⁹Tc in Hanford waste tanks, glass, and low-temperature waste forms. A significant (2% to 25%) fraction of the ⁹⁹Tc in the water-soluble portion of the tank waste may be present as a non-pertechnetate species that has not been identified and, based on experimentation to date, cannot be effectively separated from the wastes. This task will provide a sensor specifically tuned to detect the Tc(I)-carbonyl species believed to constitute the main fraction of the non-pertechnetate form of technetium. By direct measurement of the non-pertechnetate species, such a sensor will help reduce the uncertainties in the modeling of the fate and speciation of ⁹⁹Tc in Hanford tanks and waste forms. This report summarizes work done in FY 2014 exploring the chemistry of a low-valence technetium species, [Tc(CO)₃(H₂O)₃]⁺, a compound of interest due to its implication in the speciation of alkaline-soluble technetium in several Hanford tank waste supernatants. Progress made in FY 2014 was sponsored by the Department of Energy???s Office of Environmental Management and is summarized in this report.