Spatial distribution characteristics, source analysis and risk assessment of polycyclic aromatic hydrocarbons in topsoil of a typical chemical industry park

Polycyclic aromatic hydrocarbons (PAHs) are widely distributed in soil and difficult to degrade, posing a great threat the ecological environment human health. Therefore, research on distribution characteristics risks of PAHs is significance protect ecosystem Taking typical chemical industry park Chongqing as an example, spatial content 54 topsoil samples area were analyzed, pollution was evaluated by incremental models such single-factor index Nemerow comprehensive index. A factor decomposition model Positive Definite Matrix Factorization (PMF) used analyze sources PAHs. The results showed that 16 kinds optimally controlled detected, ΣPAHs ranged from ND 16.07 mg/kg, with average value 1.78 mg/kg; spatially, pollutant levels higher south southwest well center; source analysis this city coke combustion sources, traffic emission biomass oil coal leakage contribution rates 10.7%, 35.2%, 20.7%, 5.0%, 24.6%, 3.7%; respectively. health risk assessment shows there no potential carcinogenic different age groups area, main exposure route adults dermal > ingestion inhalation, children inhalation.