Influence of Fe(III) Colloids on Np(V) Migration through Quartz-Packed Columns.

• NAGASAKI Shinya

  The Department of Quantum Engineering and Systems Science, The University of Tokyo

• TANAKA Satoru

  The Department of Quantum Engineering and Systems Science, The University of Tokyo

• SUZUKI Atsuyuki

  The Department of Quantum Engineering and Systems Science, The University of Tokyo

Abstract

The influence on Np(V) migration behaviour through quartz-packed columns brought by the presence of Fe(III) real colloid was studied at pH 6.0 and 9.5. At pH 6.0, NpO₂⁺ -which constituted the dominant species of Np(V) at this pH-proved to move faster in the presence than in the absence of Fe(III) real colloid. Moreover, whereas 25-30% of the supplied NpO₂⁺ was found retained in the column in the absence of Fe(III) real colloid, the presence of this colloid induced about 95% of the NpO₂⁺ to be recovered from the column. It is shown that change in the particle size distribution brought about by the formation of Fe(III) real colloid, and the consequent effect on the filtration of Np(V)-Fe(III) pseudocolloid, vitally influence the migration behaviour of the NpO₂⁺ At pH 9.5, more than 50% of NpO₂CO₃^- -the dominant Np(V) at this pH -remained uneluted in the column, whether or not Fe(III) real colloid was present. The filtration behaviour of NpO2₂CO₃^- -in the forms of Np(V)-Fe(III) and Np(V)-silica pseudocolloidsignificantly affects the migration behaviour of NpO₂CO₃^-. At both pH 6.0 and 9.5, the first stage of contact with eluant was characterized by a small but distinct fraction of Np(V)-Fe(III) pseudocolloid that was eluted from the column faster than HTO, and the rate of Np(V)-Fe(III) pseudocolloid elution was higher at pH 9.5 than at pH 6.0. The rapid elution noted above of a fraction of Np(V)-Fe(III) pseudocolloid is con-sidered attributable to the formation of large pseudocolloid particles.

Journal

• Journal of Nuclear Science and Technology

  Journal of Nuclear Science and Technology 31 (2), 143-150, 1994

  Atomic Energy Society of Japan

Keywords

• colloids
• neptunium ions
• iron ions
• pH values
• Np(V)
• Fe(III) real colloid
• Np(V)-Fe(III) pseudocolloid
• elution
• size distribution
• filtration
• hydrodynamic chromatography

Details

• CRID: 1390282679071518464
• NII Article ID: 130000825593
• DOI: 10.3327/jnst.31.143
• COI: 1:CAS:528:DyaK2cXkt1Sltro%3D
• ISSN: 18811248
• ISSN: 00223131
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed