Accumulation and risk assessment of polycyclic aromatic hydrocarbons (PAHs) in soils around oil sludge in Zhongyuan oil field, China |
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Authors: | Shaoping Kuang Zhanchao Wu and Laishi Zhao |
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Institution: | (1) Qingdao University of Science and Technology, Qingdao, 266042, China;(2) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China;(3) Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan, 430074, China |
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Abstract: | In this paper, the contents of polycyclic aromatic hydrocarbons (PAHs) in soil samples around three different oily sludge
plants in winter were analyzed by high performance liquid chromatography (HPLC) and the pollution degree with PAHs in soil
samples was determined. Soil samples were collected from the agricultural soil around three different oily sludge plants (the
Third Wenming Plant, the Third Mazhai Plant, and the Fourth Wener Plant) along with the leeway in Zhongyuan oil field. The
distances from collected sample sites to oily sludge plants are 10, 20, 50, 100, 200, and 500 m, respectively. The results
show that the contents of PAHs in soil samples decrease dramatically with the increase of the distance from the oily sludge,
and that the PAHs with 2–4 rings are major pollutants in the oily sludge and soil samples. The main factors, which influenced
the distribution of PAHs are discussed. Based on Nemero Index P, the classification evaluation shows that the soils around
the oily sludge are heavily polluted in winter. The health risk assessment and ecological risk assessment of the soils around
the oily sludge in Zhongyuan oil field in winter are analyzed. |
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