The Solubility of Metallic Selenium under Anoxic Conditions
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<jats:title>ABSTRACT</jats:title><jats:p>The solubility of metallic selenium was measured in a mixture of 0.1M-NaCl and 0.05M-N<jats:sub>2</jats:sub>H<jats:sub>4</jats:sub>under anoxic conditions (O<jats:sub>2</jats:sub> < 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 Se<jats:sub>4</jats:sub><jats:sup>2</jats:sup>at 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</jats:p><jats:p>Se(cr) + H<jats:sup>+</jats:sup> + 2e<jats:sup>-</jats:sup> = HSe<jats:sup>-</jats:sup> logK<jats:sup>0</jats:sup> = -6.5±0.5 and</jats:p><jats:p>4Se(cr) + 2e<jats:sup>-</jats:sup> = Se<jats:sub>4</jats:sub><jats:sup>2-</jats:sup> logK<jats:sup>0</jats:sup> = -16.8±0.5</jats:p><jats:p>were determined. The standard molar free energy of formation of HSe<jats:sup>-</jats:sup> and Se<jats:sub>4</jats:sub><jats:sup>2-</jats:sup>was determined to be (37.1±2.9) and (95.9±2.9) kJ/mol, respectively.</jats:p>
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- MRS Proceedings
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MRS Proceedings 663 2000-01-01
Springer Science and Business Media LLC