Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 25, 2001
Publication Date: October 25, 2001
Citation: LOGSDON, S.D., LAIRD, D.A. BOUND WATER IN SMECTITES: CHARACTERIZATION BY DIELECTRIC SPECTROSCOPY. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2001. CD-ROM. MADISON, WI. Technical Abstract: Dielectric spectroscopy has been used in many fields of science to explain molecular relaxation and ion mobility phenomena. The complex dielectric properties are also useful for interpreting time domain reflectometry soil water data, field electrical conductivity mapping, and remote sensing soil water studies. This paper will describe the dielectric spectroscopy technique. The objective is to utilize dielectric spectroscopy as a tool to characterize water surface interactions in soil. We measure dielectric spectra for several monoionic soil clays over a range of temperatures and water contents (from humidification). From this data we determine relaxation times and activation energies, which are used to explain bound water properties and the contribution of surface ion migration to electrical conductivity.