密云水库岸边带不同高程土壤中多环芳烃的污染特征及其对水体的生态风险

doi:10.19741/j.issn.1673-4831.2021.0560

Abstract

Abstract: Affected by the South-to-North Water Diversion Project and seasonal rainfall, the water level of Miyun Reservoir rose year by year and formed periodic water fluctuations on the riparian area, which could change the ecological environment and affect the storage and release of polycyclic aromatic hydrocarbons (PAHs) in the soil. In order to explore its potential risks to the water environment, the surface soil and sediment samples of the riparian area were collected with an elevation between 130 and 150 m. GC-MS (gas chromatography and mass spectrometry) were used for analyzing the content level and composition characteristics of 16 PAHs for priority control, and their distribution characteristics under different elevations, sources and their potential ecological risks were studied. The results show that:(1) 16 PAHs are commonly found in the surface soil and sediment of the riparian area. The contents of ∑₁₆PAHs range from 66.74 to 481.34 ng·g^-1, and the pollution level is lower than that of the sediments in the reservoir. (2) Similar to the composition of PAHs in the sediments, the PAHs in the soil and sediment on the riparian area of the reservoir are mainly low-middle-rings. Naphthalene, phenanthrene, anthracene, and pyrene are dominant compounds. Source apportionment shows that the main source of PAHs is the burning of local biomass (farmland residues or vegetation), which is closely related to human activities. The Baihe storage area shows the characteristics of a mixed source, and the source of PAHs is related to the pollution of petroleum discharge. (3) The contents of PAHs in 3 different elevation of 130-140, >140-145, >145-150 m are 177.06, 223.86 and 212.63 ng·g^-1, respectively, and the low-ring PAHs are the main component. (5) The ecological risk assessment shows that most of the soil samples are less likely to produce negative ecological benefits. Only the riparian area of Baihe, the northern flooded area and the eastern area of the reservoir have potential ecological risks.

Key words: riparian areas of the reservoir, polycyclic aromatic hydrocarbons(PAHs), contamination characteristics, source apportionment, ecological risk of soil

CLC Number:

LIU Yi, JIANG Xuan, WANG Xia, ZHANG Qing-zhuo, ZHAO Gao-feng, WANG Xiao-yan. Contamination Characteristics and Water Ecological Risk of Polycyclic Aromatic Hydrocarbons in the Soil from Riparian Area of Miyun Reservoir[J]. Journal of Ecology and Rural Environment, 2023, 39(2): 190-196.

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Contamination Characteristics and Water Ecological Risk of Polycyclic Aromatic Hydrocarbons in the Soil from Riparian Area of Miyun Reservoir

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