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Contribution of Magnetite to Oxalate-Extractable Iron in Soils and Sediments from the Maumee River Basin of Ohio¹

ABSTRACT

Magnetic separations of whole soil and sediment samples from the Maumee River Basin (Ohio) commonly produced small but significant quantities of detrital magnetite. These magnetites were soluble in acid solutions of ammonium oxalate and were also more reactive than a standard magnetite sample of comparable particle size. Differential thermal analyses suggested that the enhanced reactivity of the soil and sediment magnetites may be due to altered grain surfaces. Since detrital magnetite is a common constituent of the sand and silt fractions of many soils and sediments, care should be exercised when evaluating "amorphous" iron data obtained by any of the popular oxalate procedures.

¹ Contribution from the Dep. of Agron., The Ohio State Univ., Ohio Agric. Res. and Development Center, Journal Paper no. 102–80. Presented before Div. S-9, Soil Sci. Soc. of Am., Ft. Collins, Colo.

² Former Graduate Research Assistant, Assistant Professor, Technical Assistant, and Associate Professor, respectively, Ohio Agric. Res. and Development Center and The Ohio State Univ. The senior author is now Soil Erosion Specialist, USDA Sedimentation Laboratory, Oxford, Miss.

Received for publication May 27, 1980. Accepted for publication January 2, 1981.

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