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Determination of Iron with Thiocyanate¹

ABSTRACT

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.

¹ Contribution No. 66-24 from the College of Earth and Mineral Sciences, Pennsylvania State Univ. The author wishes to express his sincere thanks to N. Suhr, J. Bodkin, and L. J. Johnson of Pennsylvania State Univ. for their critical reviews and comments in the preparation of this report. The research is supported by a grant from the Earth Science Div., National Science Foundation.

² Former Assistant Professor of Mineralogy, Pennsylvania State Univ. The author is now Associate Research Professor, Dept. of Soils and Crops, Rutgers Univ., New Brunswick, N. J.

Received for publication October 10, 1966. Accepted for publication January 16, 1967.