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Isolation and Characterization of Some Soil Allophanes¹

ABSTRACT

A fractionation procedure based on H-dispersion was used to concentrate inorganic amorphous colloidal materials from several soils. Concentrate was evaluated by use of X-ray diffraction, infrared absorption, electron microscopy, and chemical techniques. The allophanes were shown to be metallic silicates, largely hydrous aluminum silicate, which may be a residue of chemical weathering within the soil profiles. In the B and C horizons examined, microcrystalline particles of halloysite were shown to be intimately mixed with the amorphous residues. The presence of amorphous Al(OH)₃ (or related polymers) in the allophanes is suggested.

¹ Contribution from the Soils Department, Univ. of Wisconsin, Madison. Published with the approval of the Director, Wis. Agr. Exp. Sta. Supported in part by a grant under Title IV of the National Defense Education Act of 1958.

² Project Associate and Assistant Professor of Soils, respectively.

Received for publication September 27, 1963. Accepted for publication December 17, 1963.