Sorption behavior of selenium(-II) on rocks under reducing conditions

Iida, Yoshihisa ; Tanaka, Tadao ; Yamaguchi, Tetsuji ; Nakayama, Shinichi 

Batch sorption experiments were carried out to investigate sorption behavior of selenium onto granodiorite, sandy mudstone, tuffaceous sandstone and their major constituent minerals and accessory minerals under reducing conditions. Rocks and groundwater employed in the experiments were sampled with a special care avoiding exposing the rocks and groundwater to the air to minimize their oxidation. The dominant sorbent minerals for selenium were determined to be biotite for granodiorite, and pyrite for sandy mudstone and tuffaceous sandstone at neutral-alkaline pH.