Abstract
The groundwater and soil of Nanjing 1211 Chemical Plant were investigated by the method of high-density resistivity
after the plant closure. The results show that there are high resistance anomaly areas of aquifer and soil between 17
and 45 meters where the resistivity is higher than 100 ohm-m. Chemical analyses show that the high resistance
anomaly areas are caused by DNAPLs pollution. The spatial distribution of underground pollutants was delineated
and the origin of the contaminants was confirmed. The research shows that high-density resistivity method is
effective in locating heavy organic pollution of groundwater and soil of chemical plants. The method is both
economical and convenient to detect organic pollution and is recommended for such usage.