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  • 1 Kyoto University Research Reactor Institute Noda, Kumatori, Sennan, Osaka 590-0494 Japan
  • | 2 Japan Nuclear Cycle Development Institute O-arai Engineering Center 4002 Narita O-arai, Ibaraki 311-1393 Japan
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Extraction behaviors of Pd(II) in the TRUEX and PUREX solvent extractions were studied by using octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide. The effect of scrubbing in the TRUEX solvent extraction was demonstrated by adding oxalic acid. The distribution ratios of palladium (DPd's) in the diluted region of [HNO3] were found to depend strongly on the fraction of cationic species, Pd(NO3)+, existed in the aqueous phase. The gradual decrease of DPd with the increase of acidity beyond [H+] 1 mol·dm-3 was controlled by the formation of the anionic species Pd(NO3)3-.