Microbatch Venturi-type System for Determination of Selenium(iv) by Hydride Generation Atomic Absorption Spectrometry

Abstract

A simple microbatch system for the determination of selenium(iv) by use of hydride generation atomic absorption spectrometry was developed. The principle is based on the aspiration of the hydride formed in the reaction flask and its transport to the atomization cell. A Venturi-type device and argon as carrier gas are used. The microbatch system has an analytical range up to 100 ng Se with low consumption of reagents. The characteristic mass obtained was 0.16 ng, with a relative standard deviation of 1.3%, based on ten replicate measurements of aliquots containing 50 ng of Se in aqueous solution. The detection limit was 0.80 ng at 90% confidence level. Selenium(iv) was determined in two samples of drinking water spiked with an Se reference solution. The recoveries were 99 and 103% (mean of ten replicates).

References

1. A. R. Gennaro, Remington-Farmacia, Medica Panamericana, Buenos Aires, Argentina, 17th edn., 1987, vol. 2.
2. A. J. Aller, J. L. Bernal, M. J. del Nozal and L. Debán, J. Sci. Food. Agric., 1990, 51, 447.
3. A. J. Aller and C. Garía-Olalla, J. Anal. At. Spectrom., 1992, 7, 753.
4. B. Welz, S. Akman and G. Schlemmer, J. Anal. At. Spectrom., 1987, 2, 793.
5. T. Kantor, L. Bezur, E. Pungor and J. D. Winefordner, Spectrochim. Acta, Part B, 1983, 38, 581.
6. B. Welz, M. Melcher and G. Schlemmer, Fresenius' Z. Anal. Chem., 1983, 316, 271.
7. B. Welz and M. Melcher, Spectrochim. Acta, Part B, 1981, 36, 439.
8. K. S. Subramanian, Fresenius' Z. Anal. Chem., 1981, 305, 382.
9. M. Yamamoto, M. Yasuda and Y. Yamamoto, Anal. Chem., 1985, 57, 1382.
10. S. Nielsen, J. J. Sloth and E. H. Hansen, Analyst, 1996, 121, 31.
11. D. W. Bryce, A. Izquierdo and M. D. Luque de Castro, J. Anal. At. Spectrom., 1995, 10, 1059.
12. W. Holak, Anal. Chem., 1969, 41, 1712.
13. F. J. Schimidt and J. L. Royer, Anal. Lett., 1973, 6, 17.
14. P. Barth, V. Krivan and R. Husbeck, Anal. Chim. Acta, 1992, 263, 111.
15. B. Welz and P. Stauss, Spectrochim. Acta, Part B, 1993, 48, 951.
16. K. C. Thompson and D. R. Thomerson, Analyst, 1974, 99, 595.
17. T. Wickstrom, W. Lund and R. Bye, J. Anal. At. Spectrom., 1991, 6, 389.
18. B. Zhang, K. Tao and J. Feng, Spectrochim. Acta, Part B, 1989, 44, 247.
19. B. Zhang, K. Tao and J. Feng, J. Anal. At. Spectrom., 1992, 7, 171.
20. F. Nakata, Y. Yasui, H. Matsuo and T. Kumamaru, Anal. Sci., 1985, 1, 417.
21. B. Welz and M. Melcher, Anal. Chim. Acta, 1981, 131, 17.
22. J. A. Fiorino, J. W. Jones and S. G. Capar, Anal. Chem., 1976, 48, 120.
23. International Union Of Pure and Applied Chemistry, Spectrochim. Acta, Part B, 1978, 33, 241.
24. B. Welz and M. Schubert-Jacobs, At. Spectrosc., 1991, 12, 91.
25. W. G. Lan, M. K. Wong and Y. M. Sin, Talanta, 1994, 41, 195.
26. B. Welz, G. Bozsai, M. Sperling and B. Radziuk, J. Anal. At. Spectrom., 1992, 7, 505.
27. H. J. Einbrodt, S. Michels, ‘Selen’, in Metalle in der Umwelt-Verteilung, Analytik und Biologische Relevanz, ed. Merian, E., Verlag Chemie, Weinheim, 1984, p. 551.