Comparative Study of the Adsorption Selectivity of Cr(VI) onto Cationic Hydrogels with Different Functional Groups.Published in:Water, Air & Soil Pollution, 2012, v. 223, n. 4, p. 1713, doi. 10.1007/s11270-011-0977-4By:Tang, Samuel;Lo, Irene;Mak, MarkPublication type:Article