Redox and volatility of Tc(CO)3+ compounds in waste glass melting

被引：7

作者：

Luksic, Steven A. ^{[1
]}

Kim, Dongsang ^{[1
]}

Levitskaia, Tatiana ^{[1
]}

Chatterjee, Sayandev ^{[1
]}

Lukens, Wayne ^{[2
]}

Kruger, Albert A. ^{[3
]}

机构：

[1] Pacific Northwest Natl Lab, Richland, WA 99354 USA

[2] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[3] US DOE, Off River Protect, Richland, WA 99354 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2019年 / 515卷

关键词：

TECHNETIUM; RETENTION; RHENIUM;

D O I：

10.1016/j.jnucmat.2018.10.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The behavior of non-pertechnetate (Tc(I)) species was studied by preparing three portions of dried low-activity waste-glass simulated feed, combining it with either the [fac-Tc(CO)(3)(OH)](4) "tetramer," the [fac-Tc(CO)(3)(OH)(H2O2)(2)] "monohydroxo," or the [fac-Tc(CO)(3)CI3](2-) "trichloro," and then heating samples to 600, 800, and 1000 degrees C. For the feeds and the heat-treated samples, Tc concentrations were measured by liquid scintillation counting (LSC) after NaOH and HNO3 fusion, and the results were used to determine the Tc volatility. For unheated samples and samples heated to 600 degrees C, the speciation of Tc was measured by X-ray absorption near-edge structure (XANES) analysis, while partitioning of Tc in the glass-forming melt was determined by leaching the samples in water and measuring the Tc concentration of the leachate. The current results are discussed in connection with previously reported data for Tc(VII) and Tc(IV) species to rationalize the potential mechanism on how different speciation of Tc affect its retention in glass. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：199 / 205

页数：7

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