抄録
More and more attention has been paid to the effects of heavy metal pollution of soil in China, but the studies of physical and electrical properties of the heavy metal contaminated soil is still at the preliminary stage. The related physical properties will change when the soil was contaminated by heavy metal. The electrical property is one of the inherent physical properties of soil; hence the electrical property will change after soil pollution. The muddy silt clay of floodplain in Changjiang River, which is unique in China, was used to study the physical and electrical properties of heavy metal-Zn contaminated soil. In this article, the heavy metal contaminated soil was prepared by adding the solution of zinc nitrate hexahydrate. X-ray diffraction experiment (XRD) and Scanning Electron Microscope test (SEM) were adopted to analyze the mineral and chemical composition of natural silt clay. Besides, particle size analysis, liquid-plastic limit test, pH test and resistivity test were taken to analyze the variation rules of relevant physical and electrical properties in heavy metal-Zn contaminated soil, in which, the age of fines content test, liquid plastic limit test, mobility test and pH test was considered to make sure the long-term effects of heavy metal zinc pollution. For electrical properties, the resistivity was used to analyze the soil after contamination. The resistivity that was changed with different pollution concentration, water content was compared. The corresponding relationship of resistivity was established and the evaluation of pollution degree and the polluted area using resistivity was qualitative analyzed in the heavy metal-Zn contaminated silt clay.
