Czechoslovak Journal of Physics

, Volume 49, Supplement 1, pp 761–767 | Cite as

The extraction of radioisotopes of alkaline earth metals and sodium by crown ethers and dicarbollylcobaltate in nitrobenzene

  • P. Vañura
Separation Methods, Speciation

Abstract

The extraction of 22Na, 45Ca, 85Sr and 133Ba by the nitrobenzene solution of bis-1,2-dicarbol-lylcobaltate has been investigated and the influence of the presence of various substituted and unsubstituted crown ethers was shown. Extraction of alkali earth ions in absence of crown ethers increases in the sequence Mg2+<Ca2+<Sr2+<Ba2+ but the difference of values of the exchange extraction constants between Mg2+ and Ba2+ is less than one order of magnitude. The presence of 15-crown-5 increases both, the distribution ratio and the mutual extraction selectivity of alkali earth metals. The logarithm of the synergistic factor for calcium is log S=3.1, for strontium log S =6.0 and for barium log S=7.4. The extraction of Na+ in the nitrobenzene −bis-1,2-dicarbol-lylcobaltate system is low. The addition of DCH18C6 has a little effect on the distribution ratio of sodium (synergistic coefficient S=2). On the other hand, the addition of BD18C6, with almost the same diameter of a cavity as DCH18C6 causes the increase of the distribution ratio of sodium to S=500. This difference is caused by the competition of H+ ions. The distribution ratio of sodium in the system with 15C5 is almost the same as with DB18C6. A maximum on the D(Na) vs. c(15C5) dependence has been found.

Keywords

15C5 Nitrobenzene Crown Ether Distribution Ratio Separation Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Vaňura P., Selucký, P., Rais, J., Kyrš M.: Collect. Czech. Chem. Commun. 44 (1979) 157.Google Scholar
  2. [2]
    Vaňura P., Makrlík E., Rais J., Kyrš M.: Collect. Czech. Chem. Commun. 47 (1982) 1444.Google Scholar
  3. [3]
    Vaňura P., Jedináková-Křížová V., Valentová Z.: J. Radioanal. Nucl. Chem. 208, (1996) 283.CrossRefGoogle Scholar
  4. [4]
    Vaňura P.: J. Radioanal. Nucl. Chem. 228 (1998) 43.CrossRefGoogle Scholar
  5. [5]
    Vaňura P., Makrlík E.: Collect. Czech. Chem. Commun. 50 (1985) 581.CrossRefGoogle Scholar
  6. [6]
    Přibil R.: Komplexometrie, SNTL, Prague, 1977.Google Scholar
  7. [7]
    Rais, J.: Collect. Czech. Chem. Commun. 36 (1971) 3253.Google Scholar
  8. [8]
    Markin V. S., Volkov A. G.: Electrochim. Acta 34 (1989) 93.CrossRefGoogle Scholar
  9. [9]
    Harris N. K., Jin Shidao, Moody G. J., Thomas J. D. R.: Anal. Sci. 8 (1992) 545.CrossRefGoogle Scholar
  10. [10]
    Valentová Z., Vaňura P., Makrlík E.: J. Radioanal. Nucl. Chem. 223 (1997) 45.CrossRefGoogle Scholar
  11. [11]
    Vaňura P.: Solvent Extr. Ion exch 10 (1994) 145.Google Scholar
  12. [12]
    Makrlík E., Vaňura P.: J. Radioanal. Nucl. Chem. 223 (1997) 229.CrossRefGoogle Scholar
  13. [13]
    Kudo Y., Kanamori K., Takeda Y., Matsuda H.: Anal. Sci., 11 (1995) 119.CrossRefGoogle Scholar
  14. [14]
    Kudo Y., Miyakawa T., Takeda Y., Matsuda, H.: J. Inclusion Phenom. Mol. Recognit. Chem., 26 (1996) 331.CrossRefGoogle Scholar
  15. [15]
    Vaňura P., Juklíková, I.: Collect. Czech. Chem. Commun., 58 (1993) 483.CrossRefGoogle Scholar
  16. [16]
    Rais J., Šebestová E., Selucký, P., Kyrš M.: J. Inorg. Nucl. Chem. 38 (1971) 1742.CrossRefGoogle Scholar
  17. [17]
    Vaňura P., Makrlík E.: J. Radioanal. Nucl. Chem., 237 (1998) 11.CrossRefGoogle Scholar

Copyright information

© Institute of Physics, Acad. Sci. CR 1999

Authors and Affiliations

  • P. Vañura
    • 1
  1. 1.Department of Analytical ChemistryInstitute of Chemical TechnologyPragueCzech Republic

Personalised recommendations