Polarographic behaviour of metals in ethanolamines

Part V. Copper
  • R. S. Subrahmanya


  1. 1.

    The polarographic behaviour of copper-ethanolamine complexes has been studied at various pH values and also employing the following alkaline reagents, namely, sodium hydroxide, sodium carbonate and ammonium chloride-ammonium hydroxide.

  2. 2.

    It has been noticed that the reduction process is essentially reversible in presence of mono- and diethanolamines and irreversible with triethanolamine.

  3. 3.

    The phenomenon of split wave has been noticed only in solutions containing triethanolamine and non-ammoniacal alkaline reagents. In ammoniacal solutions the split waves are noticed with all the three amines. These observations have been suitably accounted for.

  4. 4.

    The formation of the following complexes is deduced from the polarographic data: Cu2(Moen)4(OH)3 + Cu(Moen)2 ++ Cu (Moen)3 ++ Cu (Dien)1 (OH)2 Cu (Dien)2 (OH)2 Cu (Dien)2 ++ Moen and Dien represent monoethanolamine and diethanolamine respectively.

  5. 5.

    It has been concluded that ethanolamine complexes of copper can be employed for analytical estimation of copper.

  6. 6.

    Thermodynamic constants have been calculated from polarographic data in systems giving rise to reversible reduction processes.



Dien Ethanolamine Triethanolamine Monoethanolamine Ethanol Group 
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Copyright information

© Indian Academy of Sciences 1957

Authors and Affiliations

  • R. S. Subrahmanya
    • 1
  1. 1.Department of General ChemistryIndian Institute of ScienceBangalore-3

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