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Soil Science Society of America Journal Abstract -

A New Approach to Determination of Cation Exchange Capacity1


This article in SSSAJ

  1. Vol. 41 No. 4, p. 818-820

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  1. M. J. Fernando2,
  2. R. G. Burau3 and
  3. K. Arulanandan4



The dielectric dispersion (Δε0), defined as the difference in the dielectric constant of a sample measured at 3 × 106 Hz and at 75 × 106 Hz, was linearly related to CEC of the sample. One linear relationship between Δε0 and CEC was obtained for clay-silica flour mixtures where CEC was varied by changing the proportion of clay in the sample as well as by using clays with different CEC (kaolinite, illite, montmorillonite). A second linear relationship, with somewhat different slope, was obtained between the Δε0 and the CEC of natural soil samples.

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