Determination of Iron with Thiocyanate
1967
Hsu, Pa Ho
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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