金属离子污染砂土复电阻率的时变特征及形成机制

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Abstract In order to understand the time-varying characteristics and control mechanisms of complex resistivity in soils with different contamination degree, the experiment of sand column and water column was designed to measure the phase in 10⁰~10³Hz by taking NaCl, MnCl₂ and artificial seawater as contaminants. The results showed that the phase decreased with the pollutant concentration and increased with the frequency. The phase in sand column was more sensitive than that in water column with the change of pollutant concentration. Under the background of soil and water, when contaminated by 1g/L NaCl, the phase of soil decreased by about 42%, while the change in water column was almost invisible at 1Hz. The results of repeated measurements for fixed frequencies showed that the phase in water column was stable while it took on obvious time-varying property in sand column (>16Hz). This property also decreased with pollutant content in solution. At 10²Hz, the background value of phase measurement in sand column was between -4.05~-11.67mrad, the variance reached 4.8 while it was only 0.09 in water column. Complex resistivity method has better performance in detection and monitoring of cations contaminated sites, the change of its parameters is mainly related to the content of cations in pore water. However, due to the interface properties and the complexity of the pore structure, migration and polarization of charge carrier in the medium are chaotic by the alternating current, and finally cause phase fluctuation.

Key words： phase dielectric properties joint inversion geophysical prospecting

Received: 06 August 2018

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X53

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	Articles by authors
	WANG Ze-ya
	XU Ya
	DONG Lu
	NAI Chang-xin
	PAN Yong-tai
	LIU Yu-qiang

Cite this article:

WANG Ze-ya,XU Ya,DONG Lu等. Complex resistivity of cationic metal contaminated sandy soils: Time-varying characteristics and formation mechanism[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1147-1153.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1147

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