Distribution and risk assessment of PAHs in river water and groundwater in North Canal basin of Beijing
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Abstract:
To study the interaction of polycyclic aromatic hydrocarbons(PAHs) in river water and different groundwater aquifer, the water qua lity data of river water and groundwater in different seasons in upstream and dow nstream of Wenyu River in the North Canal basin were collected. The contrast analysis and significance analysis methods were used to study the omposition, content, and spatial and temporal distribution characteristics of PAHs in river water and groundwater. Besides, the risk entropy method was used for risk assessmnt. The results showed that: the detection rate of PAHs in all 16 kinds of PAHs was 100%, except for BAP and Daha, while the other 14 PAHs were detected in river water, phreatic water, and confined water; the composition of PAHs was mainly Nap(1 587.42 ng/L), accounting for 85.6% of the total mass concentration; the total mass concentration of PAHs in spring was significantly lower than that in summer in phreatic water and confined water, the mass concentration of 2~3- ring PAHs was higher than that of 4-ring PAHs;t he mass concentration of PAHs in the phreatic water of the North Canal was higher than that in the confined water of the Wenyu river. Nap, Flu, and Phe were the main polutants in the groundwater of Wenyu river. Nap, Acy, and Phe were the main pollutants in the groundwater of the North Canal; the total mass concentration of PAHs in the upper reaches of the river water was lower than that in the lower reaches, and the main pollutants were Nap and Phe; Nap, Flu, Phe, Ant, Fla, Pyr, and BaA, respectively, had significant differences in different situations, except for BaA, BbF, BaP, and Dib,while the other PA Hs had significant differences in different seasonal corrditions; according to the risk entropy method, the ecological risk in summer was relatively low compared to different seasons and situations.
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