SORPTION OF COPPER (II), NICKEL (II) AND COBALT (II) IONS INTO THE IONITE MODIFIED BY POLYPHINYLCHLORIDE AND POLYETHYLENE POLYAMINE. Scientific journal of the Fergana State University, [S. l.], n. 3, p. 4, 2023. Disponível em: https://journal.fdu.uz/index.php/sjfsu/article/view/199. Acesso em: 2 jan. 2026.