Experimental analysis of AC resistivity properties of zinc contaminated sand
Song Zhiwei , Dong Xiaoqiang , Gao Yitao , Shen Jiwei , Liu Xiaofeng
DOI:
Received February 25, 2015,Revised , Accepted , Available online January 05, 2016
Volume ,2015,Pages 60-65
- Abstract
In order to explore the feasibility of AC resistivity method for monitoring zinc contaminated soil, the resistivity of zinc contaminated sand was tested, and the influences of current frequency, water content, void ratio and zinc contamination content on sand resistivity were analyzed. Therefore, an AC resistivity empirical formula of zinc contaminated sand was proposed. The results indicated that the resistivity decreased rapidly with the increase of current frequency, whereas gradually stabilized when the current frequency was higher than 50 kHz. When zinc content was lower than 50 mg/kg, the electrical resistivity was more sensitive to the change of current frequency. Then,The electrical resistivity decreased with the increase of water content, and lower the water content was, more quickly the resistivity changed. The resistivity increased slowly with the increase of the void ratio, and decreased rapidly with the increase of zinc content. Whereas it gradually stabilized when the zinc content was higher than 250 mg/kg. There was a highly relevant power function relationship between resistivity and zinc content. Based on saturation, void ratio and zinc content, an electrical resistivity empirical formula was proposed.