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Rapid Estimation of Iron Oxides in Soils and Clays by Spectrophotometric Analysis¹

ABSTRACT

A simple, rapid method is presented for the determination of Fe in soils and other ferruginous materials involving hot 6M HCl digestion followed by colorimetric analysis of the ferric chloride complex at 365 nm. Absorbance is linear up to Fe concentrations of at least 40 mg/L. An interference by oxalate in solution was found to be small enough to permit the analysis of iron oxide residues after acid ammonium oxalate treatment. No other significant interferences were found.

¹ Contribution from the Texas Agric. Exp. Stn., College Station, Tex.

² Former Research Associate and Professor of Soil Mineralogy, Soil and Crop Sciences Dep., Texas A&M Univ., College Station, TX 77843, respectively. Current address of the first author is Dep. of Soil Science and Agrometeorology, Univ. of Natal, P. O. Box 375, Pietermaritzburg 3200, Republic of South Africa.

Received for publication July 21, 1982. Accepted for publication June 6, 1983.