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Summary. Extraction of Am(III) and Ln(III) from NaClO 4 medium has been investigated with di(2-ethylhexyl) dithiophosphoric acid, di(2-ethylhexyl) monothiophosphoric acid, di(2-ethylhexyl) monothiophosphinic acid, octylphenyl dithiophosphinic acid and 11 kinds of dialkyl dithiophosphinic acids (alkyl = hexyl, heptyl, octyl, nonyl, 2-ethylhexyl, 1-methylheptyl, phenyl, chlorophenyl, methylphenyl, 2,5-dimethylphenyl, and 3,5-dichloro-4-methylphenyl) in xylene. The effect of chemical structures of those extractants on separation capability has been studied. The relationship between the slope value of the lg D − pH and extraction conditions can be described as: lg S = a lg(C HA /CIn the presence of macro amounts of Eu(ClO 4 ) 3 , the formula, lg SF Am/Eu = B − 2 lg(C HL − D Eu /(D Eu + 1)C Eu ), can well describe the relationship between separation factor and the extraction condition. A high separation factor (SF Am/Eu = 2500) is obtained by solvent extraction from 1 mol/L NaNO 3 solution with 0.5 mol/L di(2-ethylhexyl) dithiophosphinic acid in toluene.

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