Automated Continuous-flow Hydride Generation with Inductively Coupled Plasma Mass Spectrometric Detection for the Determination of Trace Amounts of Selenium(IV), and Total Antimony, Arsenic and Germanium in Sea-water

Abstract

An automated continuous-flow hydride generation system was developed for the determination of trace amounts of Se^IV and total Sb, As and Ge in sea-water using ICP-MS detection. Since the same responses can be obtained between the Sb species Sb^V and Sb^III, among the As species As^V, As^III, monomethylarsonic acid and dimethylarsinic acid, and between the Ge species Ge^IV and monomethylgermanium, a single Sb, As and Ge species can be used for calibration. A sensitivity enhancement was observed when methanol was used for matrix modification. Matrix modification was also useful for achieving recoveries close to 100% in recovery tests performed on a sea-water sample. Detection limits of 2.2 ng l^-1 for Sb as Sb^III, 6.5 ng l^-1 for As as As^V, 2.4 ng l^-1 for Ge as Ge^IV and 0.5 ng l^-1 for Se^IV were obtained. For replicate determinations in both a standard solution and a real sea-water sample, the repeatabilities were within 7% (as RSD). The proposed method is rapid (15 samples can be analysed per hour) and sufficiently sensitive to allow trace amounts of Se^IV and total Sb, As and Ge to be directly determined in surface sea-water samples taken at a high latitude of the North Pacific Ocean from Japan to Canada.

References

1. W. Holak, Anal. Chem., 1969, 41, 1712.
2. T. Nakahara, Spectrochim. Acta Rev., 1992, 14, 95.
3. X.-P. Yan and Z.-M. Ni, Anal. Chim. Acta, 1994, 291, 89.
4. H. van der Jagt and P. J. Stuyfzand, Fresenius' J. Anal. Chem., 1996, 354, 32.
5. M. O. Andreae, J.-F. Asmode, P. Foster and L. van't Dack, Anal. Chem., 1981, 53, 1766.
6. G. A. Cutter, Anal. Chim. Acta, 1978, 98, 59.
7. H. Narasaki and M. Ikeda, Anal. Chem., 1984, 56, 2059.
8. A. Tsunoda, K. Matsumoto and K. Fuwa, Anal. Sci., 1986, 2, 119.
9. A. U. Shaikh and D. E. Tallman, Anal. Chem., 1977, 49, 1093.
10. W. A. Maher, Analyst, 1983, 108, 305.
11. D. L. Tsalev, P. B. Mandjukov and J. A. Stratis, J. Anal. At. Spectrom., 1987, 2, 135.
12. J. Agterdenbos, J. P. M. van Noort, F. F. Peters and D. Bax, Spectrochim. Acta, Part B, 1986, 41, 283.
13. Narsito, J. Agterdenbos and S. J. Santosa, Anal. Chim. Acta, 1990, 237, 189.
14. T. Wickstrøm, W. Lund and R. Bye, J. Anal. At. Spectrom., 1995, 10, 803.
15. M. P. Rayman, F. R. Abou-Shakra and N. I. Ward, J. Anal. At. Spectrom., 1996, 11, 61.
16. M. Thompson, B. Pahlavanpour, S. J. Walton and G. E. Kirkbright, Analyst, 1978, 103, 568.
17. T. Wickstrøm, W. Lund and R. Bye, J. Anal. At. Spectrom., 1991, 6, 389.
18. Z.-M. Ni and B. He, J. Anal. At. Spectrom., 1995, 10, 747.
19. B. Welz and M. Melcher, Spectrochim. Acta, Part B, 1981, 36, 439.
20. B. Welz and M. Šucmanová, Analyst, 1993, 118, 1417.
21. H. Chen, I. D. Brindle and X.-C. Le, Anal. Chem., 1992, 64, 667.
22. R. Bye, Talanta, 1990, 37, 1029.
23. I. D. Brindle, H. Alarabi, S. Karshman, X.-C. Le, S. Zheng and H. Chen, Analyst, 1992, 117, 407.
24. Narsito and J. Agterdenbos, Anal. Chim. Acta, 1987, 197, 315.
25. P. Schramel and L.-Q. Xu, Fresenius' J. Anal. Chem., 1991, 340, 41.
26. B. Welz and M. Melcher, Analyst, 1984, 109, 573.
27. B. J. A. Haring, W. Van Delft and C. M. Bom, Fresenius' Z. Anal. Chem., 1982, 310, 217.
28. K. Terada, K. Matsumoto and T. Inaba, Anal. Chim. Acta, 1984, 158, 207.
29. I. D. Brindle and X.-C. Le, Anal. Chim. Acta, 1990, 229, 239.
30. X.-C. Le, W. R. Cullen and K. J. Reimer, Anal. Chim. Acta, 1992, 258, 307.
31. B. Welz and M. Šucmanová, Analyst, 1993, 118, 1425.
32. P. Allain, L. Jaunault, Y. Mauras, J.-M. Mermet and T. Delaporte, Anal. Chem., 1991, 63, 1497.
33. R. Muñoz Olivas, C. R. Quétel and O. F. X. Donard, J. Anal. At. Spectrom., 1995, 10, 865.
34. M. R. Fernandez de la Campa, E. S. Garcia, M. C. Valdes-Hevia y Temprano, B. A. Fernandez, J. M. M. Gayon and A. Sanz-Medel, Spectrochim. Acta, Part B, 1995, 50, 377.
35. S. M. Libes, An Introduction to Marine Biogeochemistry, Wiley, New York, 1992, p. 98.
36. C. I. Measures and J. D. Burton, Earth Planet. Sci. Lett., 1980, 46, 385.
37. G. A. Cutter and K. W. Bruland, Limnol. Oceanogr., 1984, 29, 1179.
38. G. A. Cutter and L. S. Cutter, Mar. Chem., 1995, 49, 295.
39. S. J. Santosa, S. Wada and S. Tanaka, Appl. Organomet. Chem., 1994, 8, 273.
40. S. Tanaka and S. J. Santosa, Biogeochemical Processes and Ocean Flux in the Western Pacific, Terre Scientific, Tokyo, 1995, p. 159.
41. M. Yamamoto, S. Tanaka and Y. Hashimoto, Appl. Organomet. Chem., 1992, 6, 351.
42. J. J. Middelburg, D. Hoede, H. A. van der Sloot, C. H. van der Weijden and J. Wijkstra, Geochim. Cosmochim. Acta, 1988, 52, 2871.
43. B. L. Lewis and M. O. Andreae, Sci. Total Environ., 1988, 73, 107.