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Fresenius' Zeitschrift für analytische Chemie

, Volume 191, Issue 5, pp 321–329 | Cite as

Polarographic separation of cobalt from nickel

  • V. D. Anand
  • J. P. Srivastava
  • G. S. Deshmukh
Originalabhandlungen
  • 14 Downloads

Summary

The polarographic behaviour of nickel and cobalt in the mixed base electrolytes, urea-pyridine and urea-hydrazine has been studied. The effect of pH, concentration of supporting electrolyte and the presence of various other ions was investigated. Well defined polarograms for both the elements were obtained at pH 6.0 and 5.0 respectively. Attempts were made to utilize these observations in the separation of the two cations. While the difference in E1/2 of the ions in urea-pyridine was greater than −0.3 volts that in urea-hydrazine was about −0.2 volts or slightly less even under the optimum conditions. In a mixed solution the waves for Co and Ni were therefore well developed and separated in the former base electrolyte. The polarograms in urea-hydrazine were, however, of little analytical use because of the washing away of the Ni wave due to the presence of even small amounts of cobalt.

Keywords

Physical Chemistry Nickel Analytical Chemistry Cobalt Inorganic Chemistry 
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.

Zusammenfassung

Das polarographische Verhalten von Nickel und Kobalt in Harnstoff-Pyridin- und Harnstoff-Hydrazinlösung wurde untersucht und der Einfluß des pH-Wertes, der Leitsalzkonzentration sowie der Gegenwart verschiedener anderer Ionen festgestellt. Bei pH 6,0 bzw. 5,0 wurden für beide Elemente gut ausgebildete Polarogramme erhalten. Es wurde versucht, die erhaltenen Ergebnisse zur Trennung der beiden Ionen zu benutzen. In Harnstoff-Pyridinlösung beträgt der Unterschied der beiden Halbstufenpotentiale mehr als −0,3 V und man erhält gut ausgebildete und voneinander getrennte Stufen. In Harnstoff-Hydrazinlösung dagegen beträgt der Unterschied nur −0,2 V oder etwas weniger, selbst unter optimaler Bedingungen, und die Ni-Stufe wird schon durch kleine Kobaltmengen beeinträchtigt.

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Copyright information

© Springer-Verlag 1962

Authors and Affiliations

  • V. D. Anand
    • 1
  • J. P. Srivastava
    • 1
  • G. S. Deshmukh
    • 1
  1. 1.Chemical LaboratoriesBanaras Hindu UniversityVaranasi-5India

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