Extraction of molybdenum and technetium with diamides of dipicolinic acid from nitric acid solutions
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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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- 1.T A. Todd, K. N. Brewer, J. D. Law, D. J. Wood, R. S. Herbst, V. N. Romanovskiy, V. M. Esimantovskiy, I. V. Smirnov, V. A. Babain, Czechoslovak Journal of Physics, Vol. 49 (1999).Google Scholar
- 3.J. D. Law, R. S. Herbst, T. A. Todd, D. R. Peterman, V. N. Romanovskiy, V. M. Esimantovskiy, I. V. Smirnov, V. A. Babain, B. N. Zaitsev, WM’01 Conference, Tucson, AZ, February 25–March 1 (2001).Google Scholar
- 14.M. Yu. Alyapyshev, V. A. Babain, I. V. Smirnov, Radiochem. (Radiokhimiya), Engl. Ed. 46 (2004) 270.Google Scholar
- 15.V. N. Romanovskiy, V. A. Babain, M. Yu. Alyapyshev, Czech. J. Phys., 56 (2006).Google Scholar
- 16.Y. Pokhitonov, V. Aleksandruk, B. Bibichev, G. Novikov, V. Riazantsev, V. Saprykin, in: Waste Management, WM’02 Conference, Tucson, AZ, February 24–28 (2002).Google Scholar
- 23.G. Lumetta, The Problem with Anions in the DOE Complex, in: B. A. Moyer, R. Singh (Eds), Fundamentals and Applications of Anion Separations, Kluwer, New York, 2004.Google Scholar
- 24.E. S. Nikitskaya, V. S. Usovskaya, M. V. Rubtsov, Zh. Obsch. Khimii, Russian J. General Chem., 28 (1958) 161.Google Scholar
- 26.P. Tkac, A. Paulenova, Speciation of Mo(VI) in Aqueous and Organic Phases of Selected Extraction Systems, Separ. Sci. Techn., 45 (2008) accepted.Google Scholar
- 29.K. Schwochau, Technetium, Chemistry and Radiopharmaceutical Applications, Wiley-VCH, Weinheim, ISBN: 3-527-29496-1, (2000) p. 11.Google Scholar