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Solvent extraction of uranium(VI) and plutonium(IV) has been investigated by three unsymmetrical monoamides, viz., N-methyl, N-butyl derivatives of hexanamide (MBHA), octanamide (MBOA) and decanamide (MBDA) in n-dodecane at 25, 30, 40 and 50 °C (±0.1). The extraction of the metal ions follows the order of the basicity of the amides (except for plutonium (IV)-MBDA system) as indicated by the equilibrium constant for the uptake of nitric acid by the amide (K H ). The order of the basicity was found to increase with the length of the carbon chain, viz., MBHA < MBOA < MBDA. Uranium(VI) and plutonium(IV) were found to be extracted as disolvates and trisolvates respectively, as was observed in the case of symmetrical monoamides. The thermodynamic parameters determined by the temperature coefficient method indicate the extraction reactions to be predominantly enthalpy stabilized.

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