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Report No.
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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 under anoxic conditions. Dominant aqueous selenium species were identified as hydrogen selenide at pH between 5 and 8, and polyselenide at pH between 9 and 13 by UV-Vis absorption spectrometry. 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 and ion interaction coefficients for HSe- and Se42- versus Na+ were determined by specific ion interaction theory.

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