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Mikrochemie

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

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

  • I. M. Kolthoff
Originalabhandlungen

Summary

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.

Keywords

Cobalt Thiocyanate Ferric Iron Nickel Sulfate Potassium Iodide Solution 
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).
    W. Skey, Chem. News16, 201, 324 (1867).Skey describes here a similar test for uranly, molybdate, tungstate, gold, copper and uses aether to shake the coloured substances out.Google Scholar
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    H. W. Vogel, Ber.12, 2313 (1879).Google Scholar
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    F. Feigl, Oesterr. Chem. Ztg. No. 11 and 12 (1923).Google Scholar
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    Pharmac. Weekbl.60, 1285 (1923).Google Scholar
  5. 5).
    E. S. Tomula, Acta. chemica Finnica, No. 3–7 (1929).Google Scholar
  6. 6).
    B. J. F. Dorrington andA. M. Ward. Analyst,54, 327 (1929).CrossRefGoogle Scholar

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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