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Electrical conductivity spectra of smectites as influenced by saturating cation and humidity

Published online by Cambridge University Press:  01 January 2024

Sally D. Logsdon  and
David A. Laird
Sally D. Logsdon*
Affiliation:
National Soil Tilth Laboratory, 2150 Pammel Drive, Ames, IA 50011, USA
David A. Laird
Affiliation:
National Soil Tilth Laboratory, 2150 Pammel Drive, Ames, IA 50011, USA
*
*E-mail address of corresponding author: logsdon@nstl.gov
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Abstract

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Electrical conductivity is an important soil property related to salinity, and is often used for delineating other soil properties. The purpose of this study was to examine the influence of smectite properties on the complex electrical conductivity spectra of hydrated smectitic clays. Four smectites were saturated with Ca, Mg, Na or K and equilibrated at four relative humidities ranging from 56 to 99%. X-ray diffraction was used to determine fractions of the various smectite layer hydrates (0 to 4 layers of interlayer water molecules) in each sample. A vector network analyzer was used to determine the real component of the complex electrical conductivity spectra (σ′) for frequencies (f) ranging from 300 kHz to 3 GHz. Values of the dc electrical conductivity(σ0), the frequency where the slope changes in the spectra (fr), and the slope at the high-frequency end of the spectra (n) were determined by fitting σ′ to σ′(f) = σ0(1 + f/fr)n. Both σ0 and fr increased with the total amount of water, the amount of interlayer water, and, for saturating cations in the order K < Mg < Ca < Na. The opposite trends were observed for n. The values of these parameters were influenced by the type of smectite, but the trends were not consistent for the effect of layer charge. The results indicate that interlayer water in smectites contributes to the electrical conductivity of hydrated smectites, and that polarization of water by local electrical fields has a substantial influence on the complex electrical conductivity spectra of smectites. The accuracy of salinity estimates for soils and sediments that are based on conductivity measurements maybe adversely affected unless the effects of hydrated clays on electrical conductivity are considered.

Keywords

Bound WaterCharge CarrierElectrical ConductivityHydrationSmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 4 , August 2004 , pp. 411 - 420
Copyright
Copyright © The Clay Minerals Society 2004

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