POLYMERMETALLIC COMPLEXES OF THE MALEIC A CID-VINYL ACETATE COPOLYMERWITH THE IONS OF EUROPIUM, SAMARIUM, LANTHANUM, NICKEL, AND COBALT

Complex formation of ions of rare-earth elements (nickel and cobalt) w ith the maleic acid-vinyl acetate copolymer was studied in aqueous sol utions of different acidity. The sorption capacity of the copolymer wa s determined as a function of the pH of the solution and the concentra tion of the europium, samarium, lanthanum, nickel, and cobalt ions at constant ionic strength mu = 0.1 under static conditions using equilib rium dialysis. The stability constants for the complexes of this copol ymer with these metals were calculated on the basis of the data of equ ilibrium dialysis. It is suggested to use this copolymer as a masking agent for the ions of rare-earth elements when determining nickel and cobalt.