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| DOI： |
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| Study of the Impact of Heavy Metals Contamination on Dielectric Properties of Soils |
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QIAO Cuiping, ZHAO Guizhang, LIU Shaokang, GAO Jing, ZHAO Mingxing, YANG Liu
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North China University of Water Resources and Electric Power, Zhengzhou 450045, China
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| Abstract: |
| Dielectric properties of soils are the basis for using the high frequency geophysical equipment and ground penetrating radar to assesse and evaluate heavy metals incontaminated soils. Taking chromium (Cr), cadmium (Cd) and lead (Pb) as examples, this paper investigated the change in dielectric constants of three soil samples - fine sand, silt and clay - using a dielectric constant instrument under different soil moisture contentafter adding Cr, Cd and Pb at different concentrations to the three soil samples. We analyzed the effect of Cr, Cd and Pb concentration, soil moisture, as well as soil particle size gradation on the dielectric constant. The results showed that without metal pollution, the dielectric constants of the three soils depended mainly on moisture and particle size gradation. After adding Cr, Cd and Pb, the dielectric constants of the soils increased significantly, especially when the soil moisture was higher than 20%. The dielectric constant is sensitive to soil texture, increasing with clay and silt contents. Therefore, the high frequency geophysical equipment and ground penetrating radar are more effective for detecting heavy medals in fine-texture soils dominated by clays and/or silts. |
| Key words: soil; heavy metal; pollution concentration; dielectric constant; soil moisture |
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