Effect of Cobalt as a Chemical Modifier for the Determination of Lead by Electrothermal Atomic Absorption Spectrometry Using a Tungsten Furnace

(Note: The full text of this document is currently only available in the PDF Version )

TOMOHIRO NARUKAWA, ATSUSHI UZAWA, WATARU YOSHIMURA and TADAO OKUTANI


Abstract

The effectiveness of cobalt as a chemical modifier was investigated for the determination of lead by electrothermal atomic absorption spectrometry using a tungsten furnace. A 10 µl aliquot of the 0.1% m/v cobalt modifier (CoCl2 in 1 M HCl) was dropped onto a tungsten metal board and pre-heating was carried out at 1200 °C. After the addition of a solution containing lead, followed by charring at a temperature of 1000 °C, the absorbance of lead was measured at an atomization temperature of 2400 °C. The loss of lead by volatilization could be suppressed at charring temperatures up to 1250 °C by the addition of the cobalt modifier. The relative standard deviation at the 0.06 mg l-1 lead level was less than 3% (n=5) and the detection limit (S/N=3) was 0.07 ng.


References

  1. E. J. Czobik and J. P. Matousek, Anal. Chem., 1978, 50, 2 CrossRef CAS.
  2. W. Slavin and D. C. Manning, Anal. Chem., 1979, 51, 261 CrossRef CAS.
  3. W. G. Brumhaugh and S. R. Koirtyohann, Anal. Chem., 1988, 60, 1051 CrossRef.
  4. S. Imai, M. Ichinoseki, Y. Nishiyama and Y. Hayashi, Bull. Chem. Soc. Jpn., 1991, 64, 901 CAS.
  5. D. L. Tsalev, V. I. Slaveykoba and P. B. Mandjukov, Spectrochim. Acta Rev., 1990, 13, 225 Search PubMed.
  6. G. Schlemmer and B. Welz, Spectrochim. Acta, Part B, 1986, 41, 1157 CrossRef.
  7. A. Isozaki, Y. Morita, T. Okutani and T. Matsumura, Anal. Sci., 1996, 12, 755 CrossRef CAS.
  8. X.-P. Yan and Z.-M. Ni, Spectrochim. Acta, Part B, 1993, 48, 1315 CrossRef.
  9. K. Yasuda, Y. Hirano, K. Hirokawa, T. Kamino and T. Yaguchi, Anal. Sci., 1993, 9, 529 CAS.
  10. Y. Terui, K. Yasuda and K. Hirokawa, Anal. Sci., 1991, 7, 599 CAS.
  11. Y. Hirano, K. Yasuda and I. Hirokawa, Bunseki Kagaku, 1995, 44, 521 CAS.
  12. K. Ouishi, K. Yasuda, Y. Morishige and K. Hirokawa, Fresenius' J. Anal. Chem., 1994, 348, 195 CrossRef CAS.
  13. Y. Hirano, K. Yasuda and K. Hirokawa, Anal. Sci., 1994, 10, 481 CAS.
  14. Y. Morishige, K. Hirokawa and K. Yasuda, Fresenius' J. Anal. Chem., 1994, 350, 410 CrossRef CAS.
  15. K. Yasuda, Y. Hirano, T. Kamino and T. Yaguchi, Anal. Sci., 1996, 12, 659 CAS.
  16. N. Fudagawa, A. Hioki and A. Kawase, Bunseki Kagaku, 1992, 41, T39 CAS.
  17. N. Fudagawa and A. Kawase, Bunseki Kagaku, 1984, 33, 328 CAS.
  18. Y. Nakamura, Y. Kobayashi and K. Abe, Bunseki Kagaku, 1986, 35, 685 CAS.
  19. S. Imai, T. Tanaka, K. Tanabe and Y. Hayashi, Bunseki Kagaku, 1990, 39, 579 CAS.
Click here to see how this site uses Cookies. View our privacy policy here.