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The extraction of Pu(IV) using 1.1 M solution of tri-iso-amyl phosphate (TiAP)/ n -dodecane (DD) from plutonium nitrate solutions in nitric acid media was examined as a function of equilibrium aqueous phase metal ion concentration and equilibrium aqueous phase acidity at 303 K. The nitric acid concentration in the organic phase was measured as a function of equilibrium organic phase plutonium concentration. The co-extraction of U(VI) and Pu(IV) was studied using 1.1 M TiAP/DD system as a function of their equilibrium aqueous phase metal ion concentration and compared with 1.1 M tri- n -butyl phosphate (TBP)/ n -DD system under identical conditions. Co-extraction and co-stripping of U(VI) and Pu(IV) were studied using 1.1 M TiAP/DD and 1.1 M TBP/DD systems in cross current mode to evaluate the number of stages required for the extraction and stripping of heavy metal ions (uranium and plutonium). The extraction and stripping efficiencies were calculated for both the systems. The saturation limit of the organic phase was also established in these studies.

radiochimica acta

Co-extraction and co-stripping of U(VI) and Pu(IV) using tri-iso-amyl phosphate and tri- n -butyl phosphate in  n -dodecane from nitric acid media under high loading conditions