Effect of Organic Liquid on Electrical Resistivity of Soil
Dr. Hsin-Yu Shan
|關鍵字:||有機液體;土壤電阻;Organic Liquid;Electrical Resistivity of Soil|
In the last few decades, Taiwan’s the petroleum industry underwent rapid development. In the meantime, the number of gasoline stations almost doubled in the last five years. As a result, accidental spills and leakage of petroleum products have occurred much more often. In addition, the lack of control in waste management processes lead to a large number of pollution of soil and ground water. Therefore, there are growing demands for better and faster methods to investigate and to remediate the contaminated sites. In order to understand the relationship between the organic liquid contamination and the electrical resistance of soil, a series of laboratory experiments were carried out. The electrical resistivity of soil with various degree of organic liquid saturation was measured. Due to the low polarity of the organic liquids, their molecules are difficult to hydrate with cations. Therefore, the diffuse double layer surrounding clay particles is difficulty to develop. For the purpose of determining the electrical conductivity of diffuse double layer, different proportion of water and organic liquid are mixed to prepare the clay specimens. In addition effect of concentration of cations in the pore water on electrical resistivity has also been investigated. From the experiment results, it is concluded that with respect to the electrical resistivity, the effect of organic liquid occupying the pores in soils is the same as air. As for the effect of cations in the soil water, lower electric resistivity was measured for soil specimens whose pore liquid is the higher concentration. At a particular water content, an increase in void ratio will result in increase in resistivity. Furthermore, at a particular void ratio, an increase in water content will lead to a decrease in resistivity.