Abstract
The synergistic solvent extraction of cobalt (II) from sulfate aqueous solutions with capric acid (HL) and tri-n-octylphosphine oxide (TOPO) intochloroform, has been studied. The experimental data for the capric acid alone reveal the self-adduct formation CoL2(HL)2, in the organic phase. A remarkable enhancement on the extraction of cobalt (II) with capric acid was observed upon the addition TOPO. The synergistic enhancement was ascribed to the adduct formation CoL2(HL)2 n(TOPO) (n= 1 or 2). The TOPO-HL interaction strongly influences the synergistic extraction efficiency. The value of the partition, dimerization and equilibrium constants were determined.
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