Abstract
AbstractA 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.
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