Abstract
A systematic study of the basic chemistry of solvent extraction of metals by organophosphorus compounds carried out in JAERI is reported. As for the general study, thermodynamic and structural chemical approaches were employed.The thermodynamical treatment of the distribution equilibrium measurement was carried out rather precisely to analyse the mechanism of solvent extraction. This was applied to determine the compositions of the complexes formed and the chemical reactions underlying.Further, it was shown the competition of metal and proton acid could clearly explain the extraction behaviors in these systems.The spectroscopic measurements of the solvents were conducted. Especially, in the infra-red region, the shift of the P=0 vibrational spectra of the solvent and the splitting of the NO3 vibrational spectra of the nitrate ions gave very powerful measures to study the microscopic mechanism of complex formation between the solvent and the species extracted.The thermodynamic and structural chemical approaches carried out were turned out to be in good accord and complementary.
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