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Report No.
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Solubility of selenium in the presence of iron under reducing conditions

Doi, Reisuke  ; Uchikoshi, Keiji*; Beppu, Hikari*

In order to determine the solubility-controlling solid of Se under reducing conditions, solubility experiments of Se were performed from oversaturation direction in the presence of Fe under reducing conditions. The Se concentration as a function of equilibration periods suggested the attainment of equilibrium in our system within a month. Only FeSe$$_{2}$$ was detected as the Se solid phase by XRD analysis of the solid samples from the equilibrated suspensions. Interpretations using the specific ion interaction theory model showed that the relationship between Eh and the measured concentrations of Se and Fe could be interpreted well by the dissolution reaction of FeSe$$_{2}$$. Therefore, we conclude that FeSe$$_{2}$$ is most likely the solubility-controlling solid of Se under these conditions.

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