Abstract
To understand the status and risk of polycyclic aromatic hydrocarbons (PAHs) pollution in industrial areas in China. The total of 4 surface soil samples were collected from a thermal power plant of Xi’an. The concentrations of 16 priority polycyclic aromatic hydrocarbons (PAHs) were analyzed by high performance liquid chromatography (HPLC). In addition, the composition, source, pollution level and risk assessment of PAHs in surface soil of thermal power plant were studied. The results showed that the total concentrations of 16 PAHs ranged from 3.28 to 8.88 μg•g-1, with a mean of 5.52 μg•g-1. The concentration of 7 carcinogenic PAHs (Σ7CPAHs) ranged from 1.52 to 4.82 μg•g-1, with a mean of 2.60 μg•g-1. The ∑PAHs in around thermal power plant surface soils of Xi’an belonged to serious pollution level. The PAHs in present study were mainly composed of medium molecular weight PAHs and high molecular weight PAHs, which have strong three effects. The results of source analysis showed that the PAHs in surface soil were mainly originated from the combustion of fossil oil, coal, wood and other biomass. The results of ecological risks of PAHs in the surface soil showed that all samples were polluted generally. The potential ecological risk of PAHs belonged to the serious level in individual PAHs and samples. There are two samples value of TEQBap exceed the security value 0.600 μg•g-1. Therefore, the environment of industrial areas should be attention and controlled.
Highlights
Xi'an is located in the Midwest of China
Except acenaphthene (Ace), the detection rate of other monomer polycyclic aromatic hydrocarbons (PAHs) in four surface soil samples was 100%, which indicated that PAHs pollution existed in the surface soil around the thermal power plant.The statistical results of PAHs content of 16 monomers in four surface soil samples of the thermal power plant are shown in Table 5.It can be seen from table 5 that the total concentration of 16 PAHs in the soil around the thermal power plant ranged from 3.28 to 8.88 μg·g-1, with an average value of 5.52 μg·g-1, and the pollution degree of PAHs in the soil reaches the serious pollution level
Based on the results of the above five common characteristic ratio methods, it can be concluded that PAHs in the soil around the thermal power plant comes from the combustion process of biomass such as oil, coal and wood, accompanied by the mixed sources of oil pollution, among which fossil fuel is the main combustion source
Summary
Xi'an is located in the Midwest of China It is an important hub city connecting the northwest and southwest of China. In order to understand the environmental problems caused by rapid industrialization, this research study takes the surrounding soil of a thermal power plant in Xi'an as the research object, preliminarily determine the contamination level, pollution status and evaluate the health risk of 16 kinds of PAHs in the soil. It can provide theoretical guidance for the environmental management of the surrounding soil in Xi'an industrial Park
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