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Isolation and Characterization of Some Soil Allophanes
Author(s) -
DeMumbrum L. E.,
Chesters G.
Publication year - 1964
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1964.03615995002800030016x
Subject(s) - amorphous solid , weathering , silicate , microcrystalline , soil water , dispersion (optics) , residue (chemistry) , halloysite , fractionation , materials science , mineralogy , diffraction , chemistry , chemical engineering , geology , crystallography , geochemistry , organic chemistry , composite material , optics , soil science , physics , engineering
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.