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An Evaluation of Zonal Centrifugation as a Research Tool in Soil Science: II. Characterization of Soil Clays
Author(s) -
Francis C. W.,
Tamura Tsuneo
Publication year - 1972
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/sssaj1972.03615995003600020044x
Subject(s) - centrifuge , loam , silt , characterization (materials science) , fraction (chemistry) , sedimentation , centrifugation , mineralogy , geology , soil test , soil science , resolution (logic) , chemistry , geotechnical engineering , soil water , chromatography , materials science , sediment , geomorphology , nuclear physics , nanotechnology , artificial intelligence , computer science , physics
Data revealed little resolution in banding is gained in centrifuging for 40 compared to 17 hours in a conventional centrifuge (force field less than 623 × g ). On the other hand, the resolution obtained by centrifuging in an ultracentrifuge is considerably better than that obtained in a conventional refrigerated centrifuge. The clay fraction from a Dodge silt loam banded into nine fractions after centrifuging at 15,000 rpm (38,500 × g ) for 17 hours. Characterization of each band allowed a much more extensive evaluation as to the quantities of each specific clay mineral present than the conventional estimates presently being made by examining X‐ray diffractograms of the total clay fractions.