Complexation study of NpO{sub 2}{sup +} and UO{sub 2}{sup 2+} ions with several organic ligands in aqueous solutions of high ionic strength Metadata

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  • Main Title Complexation study of NpO{sub 2}{sup +} and UO{sub 2}{sup 2+} ions with several organic ligands in aqueous solutions of high ionic strength


  • Author: Borkowski, M.
    Creator Type: Personal
  • Author: Lis, S.
    Creator Type: Personal
  • Author: Choppin, G.R.
    Creator Type: Personal
    Creator Info: Florida State Univ., Tallahassee, FL (United States)


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)


  • Name: Sandia National Laboratories
    Place of Publication: Albuquerque, New Mexico
    Additional Info: Sandia National Labs., Albuquerque, NM (United States)


  • Creation: 1995-09-01


  • English


  • Content Description: The acid dissociation constants, pK{sub a}, and the stability constants for NpO{sub 2}{sup +} and UO{sub 2}{sup 2+} have been measured for certain organic ligands [acetate, {alpha}-hydroxyisobutyrate, lactate, ascorbate, oxalate, citrate, EDTA, 8-hydroxyquinoline, 1, 10-phenanthroline, and thenoyltrifluoroacetone] in 5 m (NaCl) ionic strength solution. The pK{sub a} values were determined by potentiometry or spectrometry. These methods, as well as solvent extraction with {sup 233}U and {sup 237}Np radiotracers, were used to measure the stability constants of the 1:1 and 1:2 complexes of dioxo cations. These constants were used to estimate the concentrations required to result in 10 % competition with hydrolysis in the 5 m NaCl solution. Such estimates are of value in assessing the solubility from radioactive waste of AnO{sub 2}{sup +} and AnO{sub 2}{sup 2+} in brine solutions in contact with nuclear waste in a salt-bed repository.
  • Physical Description: 19 p.


  • Keyword: Alpha-Bearing Wastes
  • Keyword: Uranium Dioxide
  • Keyword: Dissociation
  • Keyword: Hydrolysis
  • Keyword: Wipp
  • Keyword: Oxalates
  • STI Subject Categories: 05 Nuclear Fuels
  • Keyword: Ligands
  • Keyword: Solubility
  • Keyword: Aqueous Solutions
  • Keyword: Complexes
  • Keyword: Stability
  • Keyword: Citrates
  • Keyword: Brines
  • Keyword: Solvent Extraction
  • Keyword: Chelates
  • Keyword: Cations
  • Keyword: Acetates
  • STI Subject Categories: 40 Chemistry
  • Keyword: Neptunium Oxides
  • Keyword: Quinolines


  • Conference: 5. international conference on the chemistry and migration behaviour of actinides and fission products in the geosphere, Saint-Malo (France), 10-15 Sep 1995


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Other: DE95017641
  • Report No.: SAND--95-2005C
  • Report No.: CONF-950946--7
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 102411
  • Archival Resource Key: ark:/67531/metadc622839


  • Display Note: INIS; OSTI as DE95017641