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Published in Soil Sci Soc Am J 47:1240-1246 (1983)
© 1983 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Iron Oxides in Petroferric Materials1

I. J. Ibanga2, S. W. Buol2, S. B. Weed2 and L. H. Bowen3

ABSTRACT

Samples of petroferric materials with a very wide range of chemical and morphological characteristics were obtained from Australia, Bolivia, Brazil, Nigeria, Thailand, and the USA. A prominent feature of all samples is a high content of Fe and/or Al oxides, relative to other constituents. Free Fe oxide is present mainly as goethite or hematite with very small amounts of lepidocrocite in some samples. Soil sample color is related to the Fe oxide mineralogy; the reddish colored samples have a high content of hematite while the yellowish samples have a high goethite content. Also, samples with a low active Fe ratio tend to have a reddish color while those with a high active Fe ratio are yellowish in color. The active Fe ratio is not predictable from a knowledge of the crystallinity or particle size of goethite present, but the presence of lepidocrocite generally increases the oxalate-extractable Fe. Both hematite and goethite in the samples contain Al up to about 25 atom percent. Treatment of the samples with boiling 5M NaOH decreased the Al-content of some but not all hematites and goethites.

NOTES

1 Paper no. 8594 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh, NC 27650. This work was supported in part by the Natl. Sci. Found., Grant no. EAR-7904834-A01.

2 Research Assistant and Professors of Soil Science, Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27650. Current address of Senior Author is Inst. for Agric. Res. Ahmadu Bello Univ., Zaria, Nigeria.

3 Professor of Chemistry, North Carolina State Univ., Raleigh, NC 27650.

Received for publication November 8, 1982. Accepted for publication July 12, 1983.






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