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Solubility Measurement of Iron-Selenium Compounds under Reducing Conditions

Published online by Cambridge University Press:  01 February 2011

Akira Kitamura ,
Masahiro Shibata  and
Hideo Kitao
Akira Kitamura
Affiliation:
Japan Nuclear Cycle Development Institute, Tokai, Naka, Ibaraki 319–1194, Japan, E-mail: [email protected]
Masahiro Shibata
Affiliation:
Japan Nuclear Cycle Development Institute, Tokai, Naka, Ibaraki 319–1194, Japan, E-mail: [email protected]
Hideo Kitao
Affiliation:
Nuclear Development Corporation, Tokai, Naka, Ibaraki 319–1111, Japan
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Abstract

Chemical behavior of selenium (Se), which was one of the important elements for performance assessment of geological disposal of high-level radioactive waste, was investigated under reducing and iron-containing conditions. A washing method for an iron diselenide (FeSe2(cr)) reagent with acidic and basic solutions was carried out for the purification of FeSe2(cr) reagent, which was considered to be a solubility limiting solid for Se under the geological disposal conditions. Furthermore, solubility of FeSe2(cr) was measured in alkaline solutions under reducing conditions, and thermodynamic data on equilibrium reactions between Se in solution and Se precipitate were obtained. It was found that the dependencies of solubility values on pH and redox potential (Eh: vs. standard hydrogen electrode) were best interpreted assuming that the solubility limiting solid was not FeSe2(cr) but Se(cr) and the aqueous species was SeO32- in the present experimental conditions. The equilibrium constant between Se(cr) and SeO32- at zero ionic strength was determined and compared with literature values. The chemical behavior of Se under geological disposal conditions was discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 609
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

1. Firestone, R. B., and Shirley, V. S.: “Table of Isotopes”, 8th ed., John Wiley & Sons Inc., New York (1998).Google Scholar
2. Tachikawa, H., Kitao, H., Katsurai, K., Yanagisawa, I., Shibata, M., Suyama, T., and Yui, M.: JNC TN8400 99–068(1999) (in Japanese).Google Scholar
3. Mills, K. C.: “Thermodynamic Data for Inorganic Sulphides, Selenides and Tellurides”, Butterworths Co. Ltd., London(1974).Google Scholar
4. Japan Nuclear Cycle Development Institute: JNC TN1400 2000–004 (2000).Google Scholar
5. Shibutani, S., Yoshikawa, H., and Yui, M.: PNC TN8410 94–204 (1995)(in Japanese).Google Scholar
6. Stumm, W., and Morgan, J. J.: “Aquatic Chemistry”, 3rd. ed., John Wiley & Sons Inc., New York (1996)Google Scholar
7. Yui, M., Azuma, J., and Shibata, M.: JNC TN8400 99–070 (1999).Google Scholar
8. Bethke, C. M.: “The Geochemist's Workbench Release 3.0 - A User's Guide to Rxn, Act2, Tact, React, and Gtplot”, University of Illinois (1998).Google Scholar
9. Kitamura, A., Shibata, M., and Kitao, H.: JNC TN8400 2003–004 (2003)(in Japanese).Google Scholar
10. Hummel, W., Berner, U., Curti, E., Pearson, F. J., and Thoenen, T.: “Nagra/PSI Chemical Thermo-dynamic Data Base 01/01”, Universal Pub., Florida, USA (2002).Google Scholar
11. Iida, Y., Yamaguchi, T., Nakayama, S., Nakajima, T., and Sakamoto, Y.: Mat. Res. Soc. Symp. Proc, 663, 1143 (2001).Google Scholar