Adsorption of Se(IV) onto Beishan Granite

The adsorption of Se(IV) onto crushed Beishan granite (BS03, 600 m) was studied by a batch experimental method. The results showed that the distribution coefficient (K(d)) remained almost constant in the pH range of 3-7 and decreased at pH>7. The adsorption of Se(IV) did not vary with ionic strength. The presence of Ca(2+) (4.10x10(-3) mol . L(-1)) and SO(4)(2-)(3.17x10(-3) mol . L(-1)) had no effect on Se(IV) adsorption. Moreover, we found that the adsorption of Se(IV) (1.46x10(-5) mol . L(-1)) and Eu(III) (3.33x10(-6) mol . L(-1)) on Beishan granite had no effect on each other in the ternary adsorption system consisting of Se(IV)/Eu(III)/granite. The adsorption of Se(IV) onto Beishan granite was quantitatively interpreted by considering the two surface complexation reactions of HseO(3)(-) to form SHSeO(3) and SSeO(3)(-) on the SOH general adsorption sites.