Distribution and Risk Assessment of PAHs in the Soil around the Industrial Park in Maonan District,Maoming City
Taking the petrochemical industrial park in Maonan District,Maoming City as the research object,the content of 16 types of PAHs in the soil around the industrial park was measured.Compared with the soil pollution risk control standards for agricultural and construction land,their distribution characteristics were analyzed.Their sources were analyzed using the light to weight ratio and characteristic ratio methods,and ecological risk assessment was conducted using the toxicity equivalent factor method.The results showed that the total content of 16 types of PAHs in the soil around the industrial park ranged from 451 to 7899 ng/g,with an average of 1690 ng/g.Most PAHs monomers did not exceed the screening limit of soil pollution risk control standards,and only one point had a BaP content that exceeded the soil pollution risk screening value and did not exceed the first class land use control value;The source analysis results show that the PAHs in the soil around the industrial zone mainly come from non transportation sources such as petroleum combustion sources,while biomass and coal combustion sources also contribute partially;The ecological risk assessment showed that the TEQBaP of 16 PAHs ranged from 97.3 ng/g to 1540 ng/g,with an average value of 378.3 ng/g.Seven carcinogenic PAHs were the main contributors to cancer risk,with benzo(a)pyrene and dibenzo(a,h)anthracene having the highest contribution rates.Most of the soil around the petrochemical industrial park in Maonan District,Maoming City meets the domestic standards for soil pollution risk control for construction and agricultural land.Only one point exceeds the risk screening value for agricultural soil,which needs to be paid attention to by relevant departments.
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