Interaction of Cs+, Sr2+ and Gd3+ with humin

Humin is separated from a soil sample and characterized by elemental analys is, IR and potentiometric titration. These investigations indicated that hu min displayed similar characteristics as humic acid. The sorption behavior of Cs-137, Sr-90 and Gd-153 with humin was investigated from aqueous soluti on. The results indicated that the sorption process follows the order: Gd3>>Sr2+>Cs+. It was time dependent and increased with pH. The sorption in th e presence of humic acid or EDTA showed that both form a metal-ligand compl ex and consequently decrease the % uptake.