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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Fernando et al. (1977) studied this question.