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Solvent Effect on the Extraction of Cobalt(II) Using Bis(2-ethylhexyl) Phosphoric Acid

Abstract The solvent extraction of cobalt(II) from sulfate medium using bis(2-ethylhexy1) phosphoric acid has been investigated. The influence of the following parameters was studied: the equilibrium pH, the concentration of the extractant and the nature of diluent. Influence of diluent using several polar solvents as diluents in addition to non-polar solvents in the extraction of cobalt(II) is discussed. The extractable species has been identified as CoL2 in 1-octanol and methyl isobutyl ketone and CoL2.2HL in toluene, dichloromethane, chloroform, carbon tetrachloride and cyclohexane. Equilibrium formulations were determined for various diluents.