POLYMERMETALLIC COMPLEXES OF THE MALEIC ACID-VINYL ACETATE COPOLYMER WITH THE IONS OF EUROPIUM, SAMARIUM, LANTHANUM, NICKEL, AND COBALT

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