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Development of removal method for radioactive elements by coprecipitation with barite (BaSO$$_{4}$$)

Tokunaga, Kohei   ; Kozai, Naofumi   ; Takahashi, Yoshio*; Ohara, Yoshiyuki

In the present study, we explore a new application of barite (BaSO$$_{4}$$)) as a sequestering phase for selenite (Se(IV)) and selenate (Se(VI)) ions from aqueous solutions. Barite is a common phase in many geological environments, and it can be used to remove toxic and/or radioactive elements from aqueous solutions, but it has not been widely used in environmental studies. This study describes the mechanisms of Se distribution between barite and water, thus providing a good estimate of its ability to effectively remove Se(IV) and Se(VI) from aqueous solutions (more than 80%) using the optimized experimental parameters examined here.

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