Sorption and diffusion behavior of selenium in tuff

摘要

Sorption and diffusion behavior of Se in tuff was studied by batch sorption and through-diffu- sion experiments. Tuff samples used in the experiments were obtained from the Toki Lignite- Bearing Formation, Tono area, Gifu, central Japan. The experiments were carried out in a nitrogen Glove-box with an oxygen level less than 1 ppm at room temperature. Batch sorption experiments Of Se on crushed tuff samples ant its constituent mineral were carried out in the pH range Between 2 and 13. The fraction of Se sorbed on tuff was above 90/100 in the pH range below 8 and Decreased to below 30/100 with increasing pH.