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The Solubility of Metallic Selenium under Anoxic Conditions

Published online by Cambridge University Press:  21 March 2011

Yoshihisa Iida ,
Tetsuji Yamaguchi ,
Shinichi Nakayama ,
Tomoko Nakajima  and
Yoshiaki Sakamoto
Yoshihisa Iida
Affiliation:
Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan Email: [email protected]
Tetsuji Yamaguchi
Affiliation:
Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan Email: [email protected]
Shinichi Nakayama
Affiliation:
Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan Email: [email protected]
Tomoko Nakajima
Affiliation:
Hokkaido University, Kitaku, Sapporo, Hokkaido, 060-0810, Japan
Yoshiaki Sakamoto
Affiliation:
Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan Email: [email protected]
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Abstract

The solubility of metallic selenium was measured in a mixture of 0.1M-NaCl and 0.05M-N2H4under anoxic conditions (O2 < 1 ppm) by both oversaturation and undersaturation methods. Equilibrium was attained in 40 days. The aqueous selenium species identified were HSe at pH between 5 and 8, and Se42at pH between 10 and 13, by UV-Vis absorption spectrometry. The solid phase was identified as Se (cr) by X-ray diffraction. The equilibrium constants of

Se(cr) + H+ + 2e- = HSe- logK0 = -6.5±0.5 and

4Se(cr) + 2e- = Se42- logK0 = -16.8±0.5

were determined. The standard molar free energy of formation of HSe- and Se42-was determined to be (37.1±2.9) and (95.9±2.9) kJ/mol, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 1143
Copyright
Copyright © Materials Research Society 2001

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References

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