Precipitation of Am(III) and REE Peroxides from Alkaline Solutions Containing Complexing Agents

摘要

Precipitation of Am(III) and REE peroxides from alkaline--citrate solutions was studied spectrophotometrically. Hydrogen peroxide (0.25--0.4 M) quantitatively precipitates Am(III) and Nd(III) ions from a solution containing 0.1 M NaOH and 0.2--0.4 M citrate. After H_2O_2 decomposition, the precipitates formed are dissolved in the mother liquor. At lower alkali concentration, 4f and 5f metal ions are precipitated incompletely. In the systems studied, Am and Nd form citrate and hydroxo--citrate complexes in a solution and peroxides in the solid phase.