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Polarographic behaviour of metals in ethanolamines

Part VII. Zinc

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Summary

  1. 1.

    The polarpgraphic behaviour of the ethanolamine complexes of zinc has been studied at various pH values and in the presence of sodium hydroxide, sodium carbonate and ammonium chloride-ammonium hydroxide.

  2. 2.

    The reduction process is essentially irreversible, the degree of irreversibility increasing with the number of ethanol groups in the amine.

  3. 3.

    It has not been possible to elucidate from Polarographic data the number of ethanolamine groups that enter the complex in solutions containing sodium hydroxide or ammonium chloride-ammonium hydroxide due to the closeness in the stability of the various complexes.

  4. 4.

    The following complexes have been indicated from the Polarographie data:-Zn (Moen)2 (CO3)1 Zn (Dien)2 (CO3)x 2-2x Zn (Trien)2 (CO3)y 2-2y Moen, Dien, and Trien represent monoethanolamine, diethanolamine and triethanolamine respectively.

  5. 5.

    The reduction waves of zinc-ethanolamine complexes can be used for the estimation of zinc in sodium carbonate solutions.

  6. 6.

    Thermodynamic constants are calculated from Polarographic data in the case of the reversible system.

  7. 7.

    Some important types of Polarographic wave forms obtained in the study of metallic complexes have been given.

  8. 8.

    The limitations regarding the use of irreversible wave equations to derive the formulæ of metallic complexes have been pointed out.

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Authors and Affiliations

  1. General Chemistry Department, Indian Institute of Science, Bangalore-3

    R. S. Subrahmanya

Authors
  1. R. S. Subrahmanya
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Additional information

Communicated by Prof. K. R. Krishnaswami,f.a.sc.

Part of the Thesis approved for the Degree of Doctor of Science in the University of Mysore.

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Subrahmanya, R.S. Polarographic behaviour of metals in ethanolamines. Proc. Indian Acad. Sci. 46, 443–453 (1957). https://doi.org/10.1007/BF03045957

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  • DOI: https://doi.org/10.1007/BF03045957

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