The synthesis of two copolymers of poly[acrylamide-co-(N-(hydroxymethyl)acrylamide)] is described. Polymer analogous reactions have been used as well as direct radical polymerization. The two copolymers have been fractionated and ultrafiltered in the presence of Cu2+, Cd2+, Co2+, Ni2+, Pb2+, Zn2+, and an excess of Na+. It has been found that N+ ions do not interact with the copolymers. The effect of the different composition of the copolymers is noted in the study of Cu2+ and Pb2+, but there is no difference in the retention profiles obtained for the rest of the metal ions.