Journal of Radioanalytical and Nuclear Chemistry

, Volume 280, Issue 2, pp 307–313

Extraction of molybdenum and technetium with diamides of dipicolinic acid from nitric acid solutions


  • J. L. Lapka
    • Oregon State University
    • Oregon State University
  • M. Yu. Alyapyshev
    • Oregon State University
    • Khlopin Radium Institute
  • V. A. Babain
    • Khlopin Radium Institute
  • R. S. Herbst
    • Idaho National Laboratory
  • J. D. Law
    • Idaho National Laboratory

DOI: 10.1007/s10967-009-0518-4

Cite this article as:
Lapka, J.L., Paulenova, A., Alyapyshev, M.Y. et al. J Radioanal Nucl Chem (2009) 280: 307. doi:10.1007/s10967-009-0518-4


The concentration of molybdenum(VI) in dissolved spent nuclear fuel is comparable with the concentrations of Tc, and the minor actinides (Np, Am). Therefore it is of great interest to understand its behavior under conditions imposed by separation processes. The simultaneous extraction ability of ortho, meta, and para isomers of N,N′-diethyl-N,N′-ditolyl-dipicolinamide (EtTDPA) for molybdenum and technetium were investigated in a large range of nitric and hydrochloric acid conditions. Molybdenum shows no increase in extraction at higher concentrations of nitric acid giving a solvate number n=0 with all isomers of EtTDPA, while Mo shows great extractability from HCl. Technetium distribution ratios decrease with increasing concentrations of nitrate showing indication of ion exchange occurring between TcO4 and NO3 anions. Et(m)TDPA and Et(p)TDPA show the greatest extractability, with 60% of the total technetium extracted into the organic phase at 1M HNO3.

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© Akadémiai Kiadó, Budapest, Hungary 2009