Journal of Analytical Chemistry

, Volume 63, Issue 1, pp 26–29 | Cite as

Simultaneous second-derivative spectrophotometric determination of cobalt and vanadium using 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone

  • A. P. Kumar
  • P. R. Reddy
  • V. K. Reddy


2-Hydroxy-3-methoxy benzaldehyde thiosemicarbazone reacts with cobalt(II) and vanadium(V) at pH 6.0 forming, respectively, brown-and green-colored complexes in aqueous dimethyl formamide. The second-derivative spectrum of Co(II) complex shows a zero amplitude at 434.5 nm and a considerably large amplitude at 409.5 nm, while the V(V) complex shows a sufficient amplitude at 434.5 nm and a zero amplitude at 409.5 nm. Furthermore, the derivative amplitudes obey Beer’s law at 409.5 and 434.5 nm for Co(II) and V(V) in the range 0.059–3.535 and 0.051–4.074 μg/mL, respectively. This enables the simultaneous determination of Co(II) and V(V) without separation. A large number of foreign ions do not interfere in the present method. The method is applied to the simultaneous determination of Co(II) and V(V) in synthetic mixtures and alloy steel samples.


Vanadium Ammonium Meta Vanadate Zero Amplitude Derivative Amplitude Benzaldehyde Thiosemicarbazone 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Hoilmeyer, H., Spectrophotometry in Medicine, London: Adam Hilger, 1943.Google Scholar
  2. 2.
    Glenn, A.L., J. Pharm. Pharmacol., 1960, vol. 12, p. 595.Google Scholar
  3. 3.
    Pernarowski, M., Knevel, A.M., and Christian, J.F., J. Pharm. Sci., 1961, vol. 50, no. 1, p. 43.Google Scholar
  4. 4.
    Cho, M.J. and Pernarowski, M., J. Pharm. Sci., 1970, vol. 59, no. 9, p. 1333.CrossRefGoogle Scholar
  5. 5.
    Geinn, A.L., J. Pharm. Pharmacol., 1963, vol. 15, p. 123.Google Scholar
  6. 6.
    Wahbi, A.M., J. Pharm. Pharmacol., 1970, vol. 22, p. 848.Google Scholar
  7. 7.
    Wahbi, A.M. and Barary, M., J. Assoc. Off. Anal. Chem., 1981, vol. 64, p. 855.Google Scholar
  8. 8.
    Wahbi, A.M., Belal, S., Abdine, H., and Bedair, M., Talanta, 1982, vol. 22, nos. 10–11, p. 931.CrossRefGoogle Scholar
  9. 9.
    Wahbi, A.M., Abdine, H., and Belal, S., J. Assoc. Off. Anal. Chem., 1977, vol. 60, p. 1175.Google Scholar
  10. 10.
    Fell, A.F., Proc. Anal. Divol. Chem. Soc., 1978, vol. 15, p. 260.Google Scholar
  11. 11.
    Bedair, M., Korany, M.A., and El-Yazbi, F.A., Sci. Pharm., 1986, vol. 54, p. 31.Google Scholar
  12. 12.
    Korany, M.A., Wahbi, A.M., Elsayed, M.A., and Mandour, S., Anal. Lett., 1984, vol. 17, no. 12, p. 1373.Google Scholar
  13. 13.
    Jones, J.H., Clark, G.R., and Harrow, L.S., J. Assoc. Off. Agric. Chem., 1951, vol. 34, p. 135.Google Scholar
  14. 14.
    Singh, R.B., Garg, B.S., and Singh, R.P., Talanta, 1978, vol. 25, no. 8, p. 425.CrossRefGoogle Scholar
  15. 15.
    Reddy, K.H. and reddy, D.V., Q. Chem. Rev., 1985, vol. 1, p. 47.Google Scholar
  16. 16.
    Garg, B.S. and Jain, V.K., Mikrochem. J., 1988, vol. 38, p. 44.CrossRefGoogle Scholar
  17. 17.
    Sah, P.T. and Peoples, S.A., J. Am. Pharm. Assoc. Sci. Edn., 1954, vol. 43, p. 513.CrossRefGoogle Scholar
  18. 18.
    Vogel, A.I., A Text book of Quantitative Inorganic Analysis, London: Longman, 1985, 4th ed.Google Scholar
  19. 19.
    Jeffery, G.H., Bassett, J., Mendham, J., and Denny, R.C., Vogel’s Text Book of Quantitative Inorganic Analysis, London: Longman, 1996, 5th ed..Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • A. P. Kumar
    • 1
  • P. R. Reddy
    • 1
  • V. K. Reddy
    • 1
  1. 1.Department of ChemistrySri Krishnadevaraya UniversityAnantapurIndia

Personalised recommendations