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This article in SSSAJ

  1. Vol. 28 No. 3, p. 355-359
    Received: Sept 27, 1963
    Accepted: Dec 17, 1963

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Isolation and Characterization of Some Soil Allophanes1

  1. L. E. DeMumbrum and
  2. G. Chesters2



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.

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