Electrical properties speculation of contamination by water and gasoline on sand and clay composite

Effects of temperature, frequency, and molarity on electrical conductivity have been studied for sand-clay samples contaminated by water and gasoline. Electrical properties change according to frequency, contaminant type, and structure of components at the sample. A comparison was performed for these contaminated sand-clay samples. Changes of dielectric constant (∈′), conductivity (σ), and complex impedance with frequency (0.1 Hz 2×107 Hz), with different contaminant concentration (at constant room temperature ~ 21 °C), have been studied. The sand-clay samples were mutually wetted gradually using gasoline and distilled water. Then, electrical properties were measured sequentially. Water is 30a conductive liquid and the contaminant gasoline is an insulator. The experimental results indicate that conductivity of samples increases with increase of water concentration while with the additions of the contaminant gasoline, the sample conductivity decreases. The permittivity decreases with reduction of conductive links between grains and with the progressive increase of frequency. The conduction of electrical conductivity, commonly, increases with increase of connectivity between different links between grains. Also, conduction increases with progressive increase of frequency. Comparison of both outcomes from lab electrical measurements gives 30a speculation about the picture in the field.