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Soil Science Society of America Journal Abstract -

Separation of Clay Minerals and Soil Clays Using Isopycnic Zonal Centrifugation1


This article in SSSAJ

  1. Vol. 34 No. 2, p. 351-353

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  1. C. W. Francis,
  2. Tsuneo Tamura,
  3. W. P. Bonner and
  4. J. W. Amburgey Jr.2



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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