, Volume 8, Supplement 1, pp 176–181 | Cite as

The Cobalt-Thiocyanate Reaction for the Detection of Cobalt and Thiocyanate

  • I. M. Kolthoff


1. Alkali-thiocyanate is a sensitive reagent for the detection of cobalt in presence of 40 to 50% acetone. Ferric iron can be made harmless by addition of an excess of fluoride. A procedure has been developed for the application of the reaction as a micro-and macro test for cobalt. Cupric copper gives a sensitive reaction and must be removed. The thiocyanate is preferable to cyanate as a reagent.

2. A procedure has been described for the micro detection of thiocyanate by evaporating a drop of the solution to be tested with a small drop of cobalt sulfate and moistening the residue with acetone. The formation of a distinctly green solution indicates the presence of thiocyanate. Nitrite interferes.


Cobalt Thiocyanate Ferric Iron Nickel Sulfate Potassium Iodide Solution 
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Copyright information

© EMIL HAIM & CO. 1930

Authors and Affiliations

  • I. M. Kolthoff
    • 1
  1. 1.Contribution from the School of Chemistry University of MinnesotaUSA

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