Collect. Czech. Chem. Commun. 1979, 44, 2024-2031

Extraction of iron, cobalt, nickel and copper with dibenzyl sulfoxide solution in toluene

František Vláčil and Huynh Dang Khanh

Department of Analytical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


The dependence of the distribution ratio of the metal on the concentration of hydrochloric of nitric acid was examined for Fe, Co, Ni and Cu extraction with 0.05M solution of dibenzylsulfoxide in toluene. Iron is extracted considerably more than the other metals, and is better extracted from hydrochloric acid than from nitric acid. The separation factor αFe/M (for 8M-HCl) is of the order of 104; this is not sufficient for a separation of trace quantities of iron from Co, Ni and Cu, but even at lower concentrations of HCl (e.g., 5M) the values is high enough for extraction chromatographic separation. The composition of the iron solvate extracted from HCl or LiCl medium was determined to be HFeCl4.2 B (B = dibenzyl sulfoxide).