INVESTIGATION OF SOIL AND GROUNDWATER CONTAMINATION USING GEOPHYSICAL AND GEOCHEMICAL METHODS
LIU Hai-sheng1, HOU Sheng-li2, Ma-Wan-yun1, CHEN Die-yan1, CHENG Ye-xun2,3
1. The Key Lab. of Atomic & Molecular Nanosciences, Ministry of Education, China, Department of physics, Tsinghua University, Beijing 100084, China;
2. China University of Geosciences, Beijing 100083, China;
3. Environmental Geophysical Society, China Geology Society, Beijing 100083, China
The organic and inorganic compounds in polluted groundwater are listed in this paper. Some metal iron and nonmetal iron, total dissolved substance and salt accumulate in the groundwater while physical and chemical reaction begin between leachate and soil. This reaction leads to increase in conduction of soil, decrease in resistivity and increase in reflection geoelectrical signals of soil. The results show about 10 Ω·m resistivity values in soil and about 0.40 Ω·m in leachate in two landfill sits in north of China. The results of HDC, TEM and GPR are compared and found that result of HDC is pronounced. Hydrocarbon (freedom CH4,C2H6 absorbed by soil) and fluorescent spectrum are useful geochemical methods for detection of leakage compounds from oil and gas storage reservoirs. We present that anomaly of CH4 is of economy, efficiency and no restriction by the site. But the false signal from animal and plant decomposed must be considered carefully.
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