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ABSTRACT
The extraction equilibria of Co(II) from 1.0 M KC1 medium by the commercial extractant Cyanex 301 dissolved in toluene has been studied. The effects of pH, extractant concentration and metal concentration on the extraction behaviour have been examined. Experimental data have been treated graphically and numerically and can be explained by assuming the extraction of the dominant species CoL2. HL being bis(2,4,4-trimethylpentyl) dithiophosphinic acid, the major component of Cyanex 301. The numerical treatment also indicated the extraction of a minor species of probable stoichiometry CoClL(HL), but whereas the former species has been clearly identified, the latter species, probably due to the fact that its contribution to the extraction process is very little, can only be considered as an approximation as its stoichiometry is not defined precisely by this numerical treatment. Conditional equilibrium constants of the extraction process are also given.