Equilibrium of nitrous acid-catalyzed oxidation of neptunium in nitric acid-tbp extraction system

Osamu Tochiyama, Yoshinobu Nakamura, Yasushi Katayama, Yasushi Inoue

研究成果: Article査読

30 被引用数 (Scopus)

抄録

The redox equilibrium of neptunium with nitric and nitrous acids, [[inline]] was studied in 3 to 6 M nitric acid solutions by 30 vol% TBP-dodecane extraction. The equilibrium distribution ratio of neptunium was shown to be expressed by D=D6R/(l+R), where R is [Np(VI)]/[Np(V)] and D6the distribution ratio of pure Np(Vl). To examine the dependence of the apparent concentration constant for the reaction, on nitric acid concentration. the redox potentials of HNO3HNO2solutions were measured which revealed that the activity correction on H+, NO3-, HNO2and H2O was effective enough to give an ideal Nernst relationship for the potential of HNO3HNO2 With using the activity coefficient quotient, Y=ys2(yuaw)1/2(ys: stoichiometric activity coefficient of nitric acid, yu: activity coefficient of HNO2, aw: rational activity of water), the apparent concentration constant Kappwas shown to be expressed by Kapp=KmixY, where [[inline]] and log Kmix=-2.77 and log Y=-0.13, 0.02 and 0.28 for [HNO3]t=3, 4 and 6 M, respectively.

本文言語English
ページ(範囲)50-59
ページ数10
ジャーナルJournal of Nuclear Science and Technology
32
1
DOI
出版ステータスPublished - 1995 1
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 原子力エネルギーおよび原子力工学

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