Sorption behavior of hydroselenide (HSe) onto iron-containing minerals

Iida, Yoshihisa ; Yamaguchi, Tetsuji ; Tanaka, Tadao 

Sorption behaviors of HSe onto iron-containing minerals, magnetite, goethite, ferrous oxide and biotite, were investigated by batch sorption experiments under reducing conditions. The sorption ratios for goethite, as representative examples, show negative dependence on pH and independence of the NaCl concentration. The results indicate that the sorption behavior of HSe is inner sphere surface complexation to ferrol sites. The triple layer model was used in the analysis of the sorption behavior of HSe with Visual Minteq computer program. The intrinsic equilibrium constant was determined by the fitting of model calculations to the experimental results to be 5.5. The value was close to the value of HS (5.3) which is chemically analogous to HSe.