Determination of long-lived radionuclides by inductively coupled plasma quadrupole mass spectrometry using different nebulizers

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J. Sabine Becker, Rajiv S. Soma, Karen L. Sutton, Joseph A. Caruso and Hans-Joachim Dietze


Abstract

Different nebulizers (cross-flow, ultrasonic and two microconcentric nebulizers) were used for sample introduction of radioactive solutions into a quadrupole-based inductively coupled plasma mass spectrometer (ICP-QMS). The best sensitivity (from 420 to 850 MHz, which is about one order of magnitude higher in comparison with the cross-flow nebulizer) for long-lived radionuclides (226Ra, 230Th, 237Np, 238U and 241Am) was observed using the ultrasonic nebulizer. However, using the ultrasonic nebulizer, a significantly higher sample size (26-fold) in comparison with the micronebulizers is required. Sample introduction by micronebulization with a small sample size in the low picogram range is the method of choice for the determination of long-lived radionuclides. The precision of determination of a 10 ng l–1 concentration was in the low-% range (and sub-% range) for all measurements using different nebulizer types. The detection limits for the determination of long-lived radionuclides in aqueous solutions applying the different nebulizers were 0.01-0.6 ng l–1. The flow injection analysis approach was optimized for isotope dilution analysis of 232Th (using 20 µl of 5 µg l–1230Th) by ICP-QMS. The isotopic abundance ratios of 230Th-232Th isotope mixtures (230Th/232Th=0.01, 0.001 and 0.0001) were determined using a microconcentric nebulizer and 1 µg l–1 Th solutions with a relative external standard deviation of long-term stability measurements (over 20 h) of 0.17, 0.62 and 2.66%, respectively.


References

  1. C. K. Kim, R. Seki, S. Morita, S. Yamasaki, T. Tsumura, Y. Igarashi and M. Yamamoto, J. Anal. At. Spectrom., 1991, 6, 205 RSC.
  2. G. P. Russ and J. M. Bazan, Spectrochim. Acta, Part B, 1987, 42, 49 CrossRef.
  3. J. S. Becker and H.-J. Dietze, Adv. Mass Spectrom., 1998, 14, 681 Search PubMed.
  4. J. S. Crain, Spectroscopy, 1996, 11, 30 Search PubMed.
  5. J. S. Becker and H.-J. Dietze, J. Anal. At. Spectrom., 1997, 12, 881 RSC.
  6. P. D. P. Taylor, P. De Bievre, A. J. Walder and A. Entwistle, J. Anal. At. Spectrom., 1995, 10, 395 RSC.
  7. I. T. Platzner, J. S. Becker and H.-J. Dietze, At. Spectrosc., 1999, 20, 6 CAS.
  8. W. Kerl, J. S. Becker, H.-J. Dietze and W. Dannecker, Fresenius' J. Anal. Chem., 1997, 359, 40 CrossRef.
  9. Inductively Coupled Plasma Mass Spectrometry, ed. A. Montaser, Wiley-VCH, New York, Chichester, Weinheim, 1998 Search PubMed.
  10. J. S. Becker and H.-J. Dietze, J. Anal. At. Spectrom., 1998, 13, 1057 RSC.
  11. W. Kerl, J. S. Becker, H.-J. Dietze and W. Dannecker, Adv. Mass Spectrom., 1998, 14, MoPo143 Search PubMed.
  12. K. Hoppstock, J. S. Becker and H.-J. Dietze, At. Spectrosc., 1997, 18, 180 CAS.
  13. W. Kerl, J. S. Becker, H.-J. Dietze and W. Dannecker, J. Anal. At. Spectrom., 1996, 11, 723 RSC.
  14. J. I. G. Alonso, F. Sena, P. Arbore, M. Betti and L. Koch, J. Anal. At. Spectrom., 1991, 6, 335 RSC.
  15. J. M. B. Moreno, J. I. G. Alonso, P. Arbore, G. Nicolaou and L. Koch, J. Anal. At. Spectrom., 1996, 11, 929 RSC.
  16. J. S. Becker, G. Küppers, F. Carsughi, W. Kerl, W. Schaal, F. Ullmaier and H.-J. Dietze, Ber. Forschungszentrums Jülich, 1996, 3272, 143 Search PubMed.
  17. W. Kerl, J. S. Becker, W. Dannecker and H.-J. Dietze, Fresenius' J. Anal. Chem., 1998, 362, 433 CrossRef.
  18. K. L. Sutton, C. B'Hymer and J. A. Caruso, J. Anal. At. Spectrom., 1998, 13, 885 RSC.
  19. A. Beauchemin and A. A. Specht, Anal. Chem., 1997, 69, 3183 CrossRef.
  20. K. G. Heumann, Int. J. Mass Spectrom. Ion Processes, 1992, 118/119, 575 CrossRef.
  21. IUPAC, Pure Appl. Chem., 1991, 63, 991 Search PubMed.
  22. J. S. Becker and H.-J. Dietze, presented at the 4th Symposium Massenspektrometrische Verfahren der Elementspurenanalyse, Mainz, 1998, Fresenius' J. Anal. Chem., in the press Search PubMed.
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