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Variations of Complex Permittivity due to Water Content and Heavy Metal Contamination  

Oh Myoun-Hak (Research institute of Energy and resources, Seoul Nationl Univ)
Kim Yong-Sung (School of Civil, Urban & Geosystem Engrg., Seoul National Univ)
Yoo Dong-Ju (School of Civil, Urban & Geosystem Engrg., Seoul National Univ)
Park Jun-Boum (School of Civil, Urban & Geosystem Engrg., Seoul National Univ)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.5, 2005 , pp. 231-241 More about this Journal
Abstract
Laboratory experiments were performed to examine the effects of water content and to see if permittivity had sufficient sensitivity to identify subsurface contamination. Both real and imaginary permittivities of unsaturated sand were strongly governed by the volumetric water content. Especially, a linear relationship between real permittivity and volumetric water content was derived at high frequencies (MHz ranges). Heavy metals in pore fluid result in significant increases in the effective imaginary permittivity, due to ionic conduction, but decreases in the real permittivity arises due to the decreased orientational polarization of water molecules caused by hydration of ions. Clear increase in the effective imaginary permittivity with heavy metal concentration was found to be valuable in the application of electrical methods for detecting heavy metals in the subsurface. However, because the permittivity is primarily dependent on the volumetric water content of soil, pre-evaluation on the volumetric water content is required.
Keywords
Heavy metal; Permittivity; Subsurface contamination; Volumetric water content;
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Times Cited By KSCI : 1  (Citation Analysis)
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