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Separation of Clay Minerals and Soil Clays Using Isopycnic Zonal Centrifugation
Author(s) -
Francis C. W.,
Tamura Tsuneo,
Bonner W. P.,
Amburgey J. W.
Publication year - 1970
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/sssaj1970.03615995003400020047x
Subject(s) - clay minerals , loam , silt , mineralogy , geology , isopycnic , polyvinylpyrrolidone , clay soil , phosphogypsum , chemistry , centrifugation , chromatography , soil water , soil science , raw material , paleontology , organic chemistry
The technique of isopycnic‐zonal centrifugation in a continuous nonaqueous density gradient was used in the purification and separation of standard clay minerals and soil clays. A suspending agent (polyvinylpyrrolidone) compatible with tetrabromoethane and ethanol stabilized clay suspensions produced multiple banding of systems which otherwise flocculated into one band. Data from x‐ray diffraction analyses revealed the technique is useful in purification of clay minerals and identification of clay minerals in soil clays; however the banding obtained from the clay fraction of a Dodge silt loam did not represent discrete bands of specific clay minerals.