Variations of Complex Permittivity due to Water Content and Heavy Metal Contamination = 함수비와 중금속 오염도에 따른 유전상수의 변화

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 "complex permittivity of sand at low frequency Journal of the Korean Geotechncial Society" 21 (21): 93-103, 2005

2 "Using complex permittivity and artificial neural networks for contaminant prediction Journal of Environmental Engineering" 740-747, 2002

3 "Use of a resistivity cone for detecting contaminated soil layers" 361-369, 2001

4 "The dielectric constant of soil-NAPL mixtures at low frequencies Proceeding of Nonaqueous Phase Liquids" 100 163-174, 1996

5 "Standard test methods for AC loss characteristics and permittivity" -94, 1994

6 "Soils and waves" 2001

7 "Soil water content measurement with a high-frequency capacitance sensor Journal of agricultural Engineering Research" 395-403, 1998

8 "Principles of Modern Chemistry" Saunders College Publishing. 1996

9 "Ohmic conductivity of a compacted silty clay Journal of Geotechnical and Geoenvironmental Engineering" 824-835, 2002

10 "Measurement of relative permittivity in sandy soils using TDR including the effects of bulk soil electrical conductivity Journal of Hydrology" 1999pp.198-211.

11 "Measurement of electrical properties of contaminated soil" 477-488, 1998

12 "Lange's Handbook of Chemistry" 1999

13 "Laboratory measurement of electromagnetic propagation constants in 1.0- to 1.5-GHz microwave special region" 5 terrain analysis by electromagnetic means (5 terrain analysis by electromagnetic means): 1971

14 "Ionic conductivity and diffusion at in finite dilution CRC Handbook of Chemistry and Physics" CRC Press. 2002

15 "Identification of contaminated soils by dielectric constant and electrical conductivity Journal of Environmental Engineering" 169-177, 1997

16 "Handbook of Vadose Zone Characterization & Monitoring" CRC Press. 1995

17 "Frequency-domain analysis of electrical dispersion of soils Journal of Geotechnical Engineering" 618-628, 1995

18 "Electromagnetic determination of soil water content Measurements in coaxial transmission lines" 574-582, 1980

19 "Effect of permeating solutions on complex permittivity of compacted clay" 1016-1025, 2002

20 "Dielectric permittivity of soils mixed with organic and inorganic fluids 0.2 GHz to 1.30 GHz Journal of Environmental and Engineering Geophysics" 37-51, 1997

21 "Complex permittivity measurement system for detecting soil contamination" 498-506, 2001

22 "Complex dielectric permittivity of soil-organic mixtures Journal of Environmental Engineering" 347-357, 2003

23 "Application of resistivity cone penetration testing for qualitative delineation of creosote contamination in saturated soils Proceedings of Geoenvironment 2000" 151-166, 1995