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  • 1 Laiyang Agricultural College Department of Basic Course 265200 Laiyang P.R. China
  • 2 Victoria University of Wellington School of Chemical and Physical Sciences P. O. Box 600 Wellington New Zealand
  • 3 The Chinese Academy of Sciences Institute of Nuclear Research P.O. Box 800-204 201800 Shanghai P. R. China
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N,N,N',N'-Tetrabutyladipicamide (TBAA) was used for the extraction of nitric acid and uranyl(II) ion from nitric acid media into toluene. The effects of nitric acid, uranyl(II) ion, and extractant concentration, temperature and back extraction on the distribution coefficient of uranyl(II) ion have been studied. The main adduct of TBAA and HNO3 is TBAA·HNO3 in 1.0 mol/l nitric acid solution. The 1:2:2 complex of uranyl(II) ion, nitrate ion and TBAA as extracted species is further confirmed by IR spectra of the extraction of uranyl(II) ion with TBAA. The values of the thermodynamic parameters have also been calculated.