| A Laboratory-Based SIP Approach to Monitoring Hydrocarbon Contamination in Fine-Grained Sediments |
| Paper ID : 1010-ISCH |
| Authors |
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Mostafa Moawad *1, Alhussein Adham Basher1, Adel Diab Kotb1, Mohamed Mahmoud Gomaa2, Ahmed Saad Elshenawy3 1Geology Department, Faculty of Science, Helwan University, Cairo, Egypt. 2Geophysical Sciences Department, Head of Geophysical Exploration Group, National Research Centre, Cairo, Egypt. 3Geophysical Exploration Department, Desert Research Centre, Cairo, Egypt. |
| Abstract |
| The use of geophysical methods is increasing due to the need to monitor soil contamination. Among these, Spectral Induced Polarization (SIP) has shown significant promise. For this study, SIP measurements were taken to detect soil contamination at different concentrations through different sample cases. This work approach takes into account the physical properties of the detected contamination using SIP. SIP has several advantages including the fast time necessary for acquisition, and the high resolution of detected signals. The research was undertaken using laboratory-controlled soil samples, including natural core, cracked core, and synthetic contaminated soil samples by oil. The results of this study show the dependence of SIP parameters corresponding to the increase of contamination concentrations. In-phase and out-of-phase conductivity reflect a significant decrease in all cases. Phase angle reflects a different response in three different cases. It decreases with natural core cases, no change in cracked core cases, while increase in synthetic samples. The peak frequency of phase angle represents different responses between core and synthetic samples with increase (strong polarization effect) and decrease with the increase of contaminant concentrations, respectively. The inversion parameters show the contamination concentration dependency with Cole-Cole exponent, chargeability and D.C. resistivity, while the relaxation time becomes independent parameter. In this context, the chargeability of the contaminated soil increased, which was accompanied by changes in phase shift, in-phase, and out-of-phase conductivity enabling clear deflection of the SIP measurement results. |
| Keywords |
| Spectral Induced Polarization (SIP), Soil, Contamination, Environmental Monitoring, Geophysical Methods. |
| Status: Abstract Accepted (Oral Presentation) |