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Sorption Behavior of Nickel and Palladium in the Presence of NH3(aq)/NH4 +

Published online by Cambridge University Press:  23 January 2013

Taishi Kobayashi
Affiliation:
Graduate School of Engineering, Nuclear Engineering, Kyoto University, Yoshida-honmahi, Sakyo-ku, Kyoto, Japan
Takayuki Sasaki
Affiliation:
Graduate School of Engineering, Nuclear Engineering, Kyoto University, Yoshida-honmahi, Sakyo-ku, Kyoto, Japan
Ken-you Ueda
Affiliation:
Graduate School of Engineering, Nuclear Engineering, Kyoto University, Yoshida-honmahi, Sakyo-ku, Kyoto, Japan
Akira Kitamura
Affiliation:
Radionuclide Migration Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency, M, Ibaraki, Japan
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Abstract

It is necessary to assess the impact of nitrate salts and their reduction products (e.g. NH3(aq)/NH4 +) contained in low-level radioactive waste generated from nuclear reprocessing process for the safety assessment of geological disposal of the waste. In the present study, sorption behavior of Ni and Pd on pumice tuff was investigated in the presence of NH3(aq)/NH4 +. Under various NH3(aq)/NH4 + concentration, pH and ionic strength conditions, distribution coefficient (Kd) of Ni and Pd on pumice tuff was determined by a batch experiment. For Ni system, the Kd values showed no significant dependence on initial NH4 + concentration ([NH4 +]ini < 1 M) in neutral pH region, which agreed with the prediction from thermodynamic data. For Pd system, the Kd values decreased with an increase of [NH4 +]ini, suggesting the formation of stable ammine complexes (Pd(NH3)m 2+ (m: 1 – 4)). The obtained Kd values for Ni and Pd were analyzed using a surface complexation model. By taking complexes predicted by thermodynamic data into account, sorption behavior of Ni and Pd in the presence of NH3(aq)/NH4 + were well explained.

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Copyright
Copyright © Materials Research Society 2013 

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References

Kitamura, A., Fujiwara, K., Doi, R., Yoshida, Y., Mihara, M., Terashima, M., Yui, M., JAEA-Data/Code 2009-024 (2010).
Rajib, M., Sasaki, T., Kobayashi, T., Miyauchi, Y., Takagi, I., Moriyama, H., J. Sci. Nucl. Technol. 48, 950 (2011).CrossRef
Silva, R. J., Benson, L. V., Yee, A. W., Parks, G. A., “Theoretical and experimental evaluation of waste transport in selected rocks,” in Waste Isolation Safety Assessment Program Task 4: Collection and Generation of Transport Data, PNL-SA8571, Lawrence Berkeley Laboratory (1979).Google Scholar
Dzombak, D. A., Morel, F. M. M., Surface Complexation Modeling; Hydrous Ferric Oxide, John Wiley, New York (1990).Google Scholar

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