Sorption and diffusion of selenium oxyanions in granitic rock

The Kd of selenium was found to be in the range of (6.2-7.0 ± 2.0) × 10− 3 m3/kg in crushed rock whereas the Kd obtained from block scale through diffusion experiment varied between (1.5 ± 0.3) × 10− 3 m3/kg and (1.0 ± 0.6) × 10− 4 m3/kg. The De of selenium was significantly higher for GG; De = (2.5 ± 1.5) × 10− 12 m2/s than for KGG; De = (7 ± 2) × 10− 13 m2/s due to the higher permeability of GG compared with KGG.