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Soil Science Society of America Journal Abstract -

Determination of Iron with Thiocyanate1


This article in SSSAJ

  1. Vol. 31 No. 3, p. 353-355
    Received: Oct 10, 1966
    Accepted: Jan 16, 1967

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  1. Pa Ho Hsu2



The effects of acidity and concentration of thiocyanate on the intensity and stability of the iron-thiocyanate color solution were studied in detail, and a procedure was proposed. In the proposed procedure, a combination of 3 ml of 6N HCl and 10 ml of 20% KSCN is recommended. In the presence of this amount of KSCN, the color intensity was constant while the amount of HCl varied from 5 to 30 meq. Hydroxy-iron polymers in the sample solution can be decomposed by heating the aliquot in the presence of acid prior to the addition of KSCN. By adding H2O2 at the end of the procedure, it is possible to confine the reading time within a short interval and thus overcome rapid color fading.

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