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A New Approach to Determination of Cation Exchange Capacity¹

ABSTRACT

The dielectric dispersion (₀), defined as the difference in the dielectric constant of a sample measured at 3 x 10⁶ Hz and at 75 x 10⁶ Hz, was linearly related to CEC of the sample. One linear relationship between ₀ 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 ₀ and the CEC of natural soil samples.

¹ Contribution from Univ. of California, Davis.

² Head Chemistry Division, Research Inst., Highways Dep., Ceylon, presently Fulbright Post Doctoral Fellow, Univ. of California, Davis.

³ Associate Professor, Land, Air and Water Resources, Univ. of California, Davis.

⁴ Associate Professor of Civil Engineering, Univ. of California, Davis.

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