Complex resistivity properties and spectral parameters of TCE contaminated soils

doi:10.13745/j.esf.sf.2021.2.4

Abstract

Abstract:

The complex resistivity has become a promising contaminant monitoring tool due to its sensitivity to pore water chemical properties, solid-liquid interface and fluid content. In this study, we chose trichloroethylene (TCE) as a typical organic contaminant and measured the complex resistivity of TCE contaminated soils by SIP method. We studied the effects of pore water salinity, water saturation and soil types on the complex resistivity characteristics and spectral parameters of TCE-contaminated soils. Results show that the complex resistivity of contaminated soil samples increases with decreasing water saturation and pore water salinity. The clay content affects the continuity of pore water. When the pore water is discontinuous, the real and imaginary parts change greatly. The total chargeability (M) increases with decreasing pore water salinity and decreases at first and then increases with decreasing water saturation. M is also reduced by decreasing specific surface area caused by the rearrangement of clay particles and increased by double layer polarization. The mean relaxation time decreases with increasing pore water salinity as shown by a logarithmic correlation. The main reason for the variation of M with water saturation is the change of polarizable pore size. This study establishes a relationship between geophysical and hydrogeological parameters, thus providing a theoretical basis for SIP field measurements.

Key words: complex resistivity, induced polarization, trichloroethylene, Debye model, spectral parameters

CLC Number:

ZHANG Zhenyu, XU Weiwei, DENG Yaping, REN Jinghua, SHI Xiaoqing, WU Jichun. Complex resistivity properties and spectral parameters of TCE contaminated soils[J]. Earth Science Frontiers, 2021, 28(5): 114-124.

Figures/Tables 14

Fig.1 Experimental setup for the spectral induced polarization (SIP) measurements

Fig.2 Testing the agar gel-iron mesh electrodes

Table 1 Physical and chemical properties of soil samples

样品	类型	阳离子交换容/ (cmol·kg^-1)	有机质含量/%	不同粒径颗粒占比/%			比表面积BET/ (m²·g^-1)	pH值	Zeta电位/mV
样品	类型	阳离子交换容/ (cmol·kg^-1)	有机质含量/%	黏粒	粉粒	砂粒	比表面积BET/ (m²·g^-1)	pH值	Zeta电位/mV
土样A	砂质土	10.76	0.16	9.56	10.37	80.07	21.22	9.75	-22.8
土样B	粉砂质土	5.52	0.29	6.65	76.87	16.48	8.57	7.62	-22.6

Fig.3 Resistivity vs. frequency plots under different pore water salinity for saturated sample A

Fig.4 Phase vs. frequency plots under different pore water salinity for saturated sample B

Fig.5 Resistivity vs. frequency curve for sample A under different levels of water saturation at 0.1 S·m-1(a), 0.01 S·m-1(b) and 1 S·m-1(c) (EC)

Fig.6 Phase vs. frequency curve for sample B under different levels of water saturation at 0.1 S·m-1(a), 0.01 S·m-1(b) and 1 S·m-1 (c) (EC)

Fig.7 Plot of resistivity vs. frequency under different water saturation at 0.1 S·m-1 (EC) for samples A (a) and B (b)

Fig.8 Relationship between total chargeability and pore water salinity

Fig.9 Relationship between the total chargeability and water saturation (sand-clay)

Fig.10 Relationship between the total chargeability and water saturation under 0.1 S·m-1 (EC) for samples A and B

Fig. 11 Relationship between the mean relaxation time and pore water salinity

Fig.12 Relationship between the mean relaxation time and water saturation

Fig.13 Relationship between the mean relaxation time and water saturation under 0.1 S·m-1 (EC) for samples A and B

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