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This article in SSSAJ

  1. Vol. 34 No. 2, p. 351-353

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Separation of Clay Minerals and Soil Clays Using Isopycnic Zonal Centrifugation1

  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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