Abstract
The extractive properties of tri-isoamyl-phosphate (TAP), an indigenously prepared extractant, and the loading capacity of extraction solvent containing TAP for U(VI) and Pu(IV) ions in nitric solution have been investigated. The dependence of the distribution ratio on the concentration of nitric acid showed that TAP has an ability to extract these actinides, while the fission product contaminants are poorly extracted. The distribution data revealed a quantitative extraction of both U(VI) and Pu(IV) from moderate nitric acidities in the range 2–7 mol · dm−3. Slope analysis proved predominant formation of the disolvated organic phase complex of the type UO2(NO3). 2TAP and Pu(NO3)4·2TAP with U(VI) and PU(IV), respectively. On the contrary, the extraction of fission product contaminants such as144Ce,137Cs,9Nb.,147Pr,106Ru,95Zr was almost negligible even at very high nitric acid concentrations in the aqueous phase indicating its potential application in actinide partitioning. The recovery of TAP from the loaded actinides could be easily accomplished by using a dilute sodium carbonate solution or acidified distiled water (≈0.01 mol · dm−3 HNO3) as the strippant for U(VI) and using uranous nitrate or ferrous sulphamate as that for Pu(IV). Radiation stability of TAP was adequate for most of the process applications.
Similar content being viewed by others
References
W. W. Shulz, J. D. Navratil, Science and Technology of Tributyl Phosphate, Vols 1–3, CRC Press, Boca Raton, Florida, 1984.
Z. Kolarik, Revs. Inorg. Chem., 10 (1989) 27.
Y. Morita, M. Kubota, J. Nucl. Sci. Technol., 24 (1987) 227.
G. M. Kosolapoff, Organophosphorus Compounds, John Wiley, New York, 1950.
T. Sato, J. Radional. Nucl. Chem., 158 (1992) 391.
D. J. Crouse, W. D. Arnold, F. J. Hurst, Proc. Intern. Solvent Extraction Conference, Denver, Colorado, 1983, p. 90.
A. S. Nikiforov, B. S. Zakhrikin, Eh. V. Renard, A. M. Rozen, Eh. Ya. Smetanin, Proc. Intern. Conf., “Actinide-89”, Tashkent, 1989, p. 20.
B. D. Pandey, D. C. Rupainwar, J. Inorg. Nucl. Chem., 41 (1979) 377.
S. H. Hasan, D. C. Rupainwar, Acta Chim. Hung., 127 (1990) 65.
S. H. Hasan, D. C. Rupainwar, Acta Chim. Hung., 127 (1990) 235.
J. P. Singh, S. H. Hasan, D. C. Rupainwar, Ind. J. Tech., 24 (1986) 169.
S. A. Pai, J. P. Shulka, P. K. Khopkar, M. S. Subramanian, J. Radional. Chem., 42 (1978) 323.
A. H. Blatt, Organic Synthesis, Vol. 2, Wiley New York, 1943, p. 109.
S. S. Rattan, A. V. R. Reddy, V. S. Mallapurkar, R. J. Singh, S. Prakash, J. Radional. Chem., 67 (1981) 95.
J. L. Ryan, E. J. Wheelwricht, USAEC Rept. HW-55893, 1959.
J. Bjerrum, G. Schwarzenbach, L. G. Sillen (Eds), Stability Constants of Metal Ion Complexes, Part II, Inorganic Ligands, Chemical Society, London, 1958.
H. R. Ihle, A. P. Murrenhof, M. Karayanis, IAEA, Viena, 1967, p. 69.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Shukla, J.P., Gautam, M.M., Kedari, C.S. et al. Extraction of uranium (VI), plutonium (IV) and some fission products by tri-iso-amyl phosphate. J Radioanal Nucl Chem 219, 61–67 (1997). https://doi.org/10.1007/BF02040266
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02040266