Chelating resins with N-substituted diamides of malonic acid as ligands

New chelating resins with improved uptake of metal ions have been synthesiz ed by functionalizing a vinylbenzyl chloride-divinylbenzene copolymer with a sodium salt of diethyl malonate followed by reacting modified beads with diamines (ethylenediamine, diethylenetriamine, 2-aminomethyl pyridine, 3-am inopropyl imidazol). Their chelating properties towards Cu(II), Cd(II), Ni( II) and Zn(II) from an acetate buffer of pH 3.7 and 5.6 have been studied. It was found that the sorption of the above cations on studied resins was h igher than the sorption on reference ones containing respective N-substitut ed amides of monocarboxylic acid. (C) 1998 Elsevier Science Ltd. All rights reserved.