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Solubility of selenium at high ionic strength under anoxic conditions

Iida, Yoshihisa ; Yamaguchi, Tetsuji ; Tanaka, Tadao ; Nakayama, Shinichi 

Solubility experiments for selenium were performed at high ionic strengths (1.0 and 2.0 M NaCl) under anoxic conditions. Dominant aqueous selenium species were identified as hydrogen selenide, HSe$$^{-}$$, at pH between 5 and 8, and polyselenide, Se$$_{4}$$$$^{2-}$$ at pH between 9 and 13. A solubility-limiting solid was determined to be amorphous selenium at pH between 5 and 8, and crystalline selenium at pH between 9 and 13. The equilibrium constants of Se(am) + H$$^{+}$$ + 2e$$^{-}$$ = HSe$$^{-}$$, logK$$^{0}$$ = -6.57$$pm$$0.15, 4Se(cr) + 2e$$^{-}$$ = Se$$_{4}$$$$^{2-}$$ logK$$^{0}$$ = -16.67$$pm$$0.03 and ion interaction coefficients for HSe$$^{-}$$ and Se$$_{4}$$$$^{2-}$$ versus Na$$^{+}$$, $$varepsilon$$(HSe$$^{-}$$, Na$$^{+}$$) = -0.01$$pm$$0.10 and $$varepsilon$$(Se$$_{4}$$$$^{2-}$$, Na$$^{+}$$) = -0.03$$pm$$0.02, were determined by specific ion interaction theory. The standard molar free energy of formation of amorphous selenium and polyselenide species were determined to be $$Delta$$$$_{f}$$G$$_{m}$$$$^{0}$$ (Se(am)) = 6.0$$pm$$2.2 kJ mol$$^{-1}$$, $$Delta$$$$_{f}$$G$$_{m}$$$$^{0}$$(Se$$_{2}$$$$^{2-}$$) = 111.64$$pm$$1.61 kJ mol$$^{-1}$$, $$Delta$$$$_{f}$$G$$_{m}$$$$^{0}$$(Se$$_{3}$$$$^{2-}$$) = 98.68$$pm$$1.02 kJ mol$$^{-1}$$ and $$Delta$$$$_{f}$$G$$_{m}$$$$^{0}$$ (Se$$_{4}$$$$^{2-}$$) = 95.14$$pm$$0.17 kJ mol$$^{-1}$$, respectively.

Language

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English

Journal

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Journal of Nuclear Science and Technology

Volume

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47

Number

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5

Pages

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p.431 - 438

Publication Year/Month

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2010/05

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Patent information

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Paper URL

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https://doi.org/10.3327/jnst.47.431

DOI for research data

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Keywords

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no keyword

Research Facility

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BECKY(バックエンド研究施設)  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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経済産業省原子力安全・保安院

Accesses

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- Accesses

InCites™

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Percentile:77.39

Category:Nuclear Science & Technology

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