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The kinetics of extraction of radioactive octahedral Co(n) by a Chloroform mixture of 8-hydroxyquinoline (HOX) and dibenzo-18-crown-6 (Dbl8C6) from nitrate medium was investigated using a stirred Lewis cell. The effects of the stirring speed, temperature, specific interfacial area and interfacial tension on the extraction rate showed that the extraction process is controlled by a chemical reaction in the bulk aqueous phase rather than at the interface. The results of the effect of [HOX], [Dbl8C6] and [H^] on the extraction rate indicated that the synergistic extraction of octahedral Co(II) is first-order dependent on HOX concentration, of fractional negative Order with respect to H"^ while it is nearly independent of the crown ether concentration. The extraction process is expressed by a reaction mechanism in which the formation of Üie 1:1 cobalt species in the aqueous phase is the rate-controlling Step.

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