Separation of Clay Minerals and Soil Clays Using Isopycnic Zonal Centrifugation
1970
Francis, C. W. | Tamura, Tsuneo | Bonner, W. P. | Amburgey, J. W.
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.
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