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Studies in the polarography of metal-amino acid complexes

Part I. Cadmium
  • G. Nageswara Rao
  • R. S. Subrahmanya
Article

Summary

1. A detailed polarographic study of cadmium has been made employing glycine,α-alanine,β-alanine, valine, aspartic acid, glutamic acid and asparagine as complexing agents at various pH values. The effect of incorporating sodium hydroxide, sodium carbonate and ammonium nitrate + ammonium hydroxide, on the polarographic behaviour of amino acid complexes of cadmium has also been investigated.

2. The reduction process has been found to be reversible in all systems.

3. The small shifts in the half-wave potentials noticed due to increase in the concentration of sodium hydroxide and sodium carbonate in presence of amino acids have been explained on the basis of formation of mixtures of pure and mixed amino acid complexes of cadmium. Mixed complexes have also been noticed in presence of ammonium hydroxide and ammonium nitrate and amino acids.

4. Polarographic evidence has been obtained for the formation of over 30 pure and mixed complexes. The dissociation constant K d , the Δ F° value for the dissociation, and standard potential value for the formation, of each complex have been computed.

5. It has been found that cadmium can be polarographically estimated in amino acid solutions.

Keywords

Cadmium Sodium Hydroxide Stability Constant Sodium Carbonate Ammonium Nitrate 
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.

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References

  1. 1.
    Kostromin, A. I. and Vekslina, V. A...Chem. Abstr., 1957,51, 5591.Google Scholar
  2. 2.
    Li, N. C., White, J. M. and Yoest, R. L...J. Amer. Chem. Soc., 1956,78, 5218.CrossRefGoogle Scholar
  3. 3.
    Nageswara Rao, G. and Subrahmanya, R. S...Curr. Sci., 1962,31, 55.Google Scholar
  4. 4.
    Harned, H. S. and Owen, B. B.Physical Chemistry of Electrolytic Solutions, Reinhold Publishing Co., N.Y., 3rd edn. 1958, p. 640.Google Scholar
  5. 5.
    Subrahmanya, R. S...Proc. Ind. Acad. Sci., 1956,43A, 133,Google Scholar
  6. 6.
    Kolthoff, I. M. and Lingane, J. J. ..Polarography, Interscience Pub., 2nd ed., 1952.Google Scholar
  7. 7.
    Calvin, M. and Bailes, R. H...J. Amer. Chem. Soc., 1946,68, 949.CrossRefGoogle Scholar
  8. 8.
    Hall, J. L. and Fisher, J. F.Anal. Chem, 1962,34, 1094.CrossRefGoogle Scholar
  9. 9.
    Laitinen, H. A., Onstott, E., Bailar, J. C. (Jr.) and Swann, S...J. Amer. Chem. Soc., 1950,72, 2484.CrossRefGoogle Scholar
  10. 10.
    Bjerrum, J. ..Metal Ammine Formation in Aqueous Solution, P. Haase and Son, Copenhagen.Google Scholar
  11. 11.
    Subrahmanya, R. S...Proc. Ind. Acda. Sci., 1956,43A, 383.Google Scholar
  12. 12.
    —————.. Ibid., 1957,46A, 433.Google Scholar
  13. 13.
    —————.. Ibid., 1957,46A, 377.Google Scholar
  14. 14.
    —————.. Ibid., 1957,45A, 180.Google Scholar
  15. 15.
    McKenzie, H. A and Mellor, D. P...Aust. J. Chem., 1962,14, 562.Google Scholar
  16. 16.
    Smith, J. H., Cruickshank, A. M., Donaughue, J. T. and Pysz, J. F., Jr.Inorg. Chem., 1962,1, 148.CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1964

Authors and Affiliations

  • G. Nageswara Rao
    • 1
  • R. S. Subrahmanya
    • 1
  1. 1.Department of Inorganic and Physical ChemistryIndian Institute of ScienceBangalore-12South India

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