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A New technique for removing oxyanions from aqueous solution by coprecipitated with barite

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

In the present study, we explore a new application of barite as a sequestering phase for radioactive oxyanions, such as selenium-79, technetium-99, and iodine-129, 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 mainly describes the mechanisms of selenite and selenate distribution between barite and water, thus providing a good estimate of its ability to effectively remove these ions from aqueous solutions (more than 80%) using the optimized experimental parameters examined here.

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