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Mapping the contaminant plume of an abandoned hydrocarbon disposal site with geophysical and geochemical methods, Jiangsu, China

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Abstract

The management and remediation of abandoned hydrocarbon-contaminated sites require detailed information on the distribution of contaminant plumes. In areas where groundwater is active, the formation of contaminant plumes is associated with hydrodynamics, the nature of the sedimentary layers, and the nature of the pollutants and the degradation process. A comprehensive survey is needed to determine this information. An abandoned hydrocarbon disposal site is located in an area where groundwater is very active. In the investigation of contaminant plumes, we combined the geophysical method with accurate geochemical analysis of subsoil and groundwater samples. Ground-penetrating radar and electrical resistivity tomography images of the electrical anomalies potentially originating from hydrocarbon pollution were used to select sites for subsurface sampling. Total petroleum hydrocarbons, total dissolved solids, and groundwater pH were measured. The results showed that the source zone had undergone long-term natural attenuation, and it was unable to continuously output organic matter to support the expansion of contaminant plumes. Low-resistivity anomalies and enhanced attenuation in the study area were caused by hydrocarbon degradation products and enhanced mineral weathering. Delineating the distribution of contaminant plumes in areas where the resistivity was below 15 Ω m. The distribution of the plume in the vertical direction was related to the hydrocarbon release history (release rate and volume) and was affected by fluctuations in the groundwater level. The contaminant plume moved very slowly along the direction of the hydraulic gradient and was in a basically stable state. The results showed that the combined application of the geoelectrical method and the geochemical method can effectively describe the distribution of underground contaminant plumes in an aged pollution site.

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Acknowledgments

We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.

Funding

This research work is supported by the National Natural Science Foundation of China for development project of major scientific research instrument (Grant No. 41427803), National Natural Science Foundation of China (Grant No. 41772307), and National Key Research and Development Projects (Grant No. 2017YFC0307701).

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Correspondence to Xiujun Guo.

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Responsible editor: Philippe Garrigues

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Shao, S., Gao, C., Guo, X. et al. Mapping the contaminant plume of an abandoned hydrocarbon disposal site with geophysical and geochemical methods, Jiangsu, China. Environ Sci Pollut Res 26, 24645–24657 (2019). https://doi.org/10.1007/s11356-019-05780-0

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  • DOI: https://doi.org/10.1007/s11356-019-05780-0

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