[Pollution Characteristics and Health Risk Assessment of Polycyclic Aromatic Hydrocarbons in the Surface Soils of a Large Steel enterprise in the North of China].

16 priority control polycyclic aromatic hydrocarbons (PAHs) were analyzed by GC-MS in 22 surface soil (0-20 cm) samples collected from a large steel enterprise in the north of China. The concentrations of Σ16PAHs ranged from 22.0 μg·kg to 20062.0 μg·kg. 4 to 5 aromatic rings were the dominant, typically fluorene(Flu) and pyrene(Pyr). Compared with related domestic research, PAH pollution in the steel enterprise reached medium level, with fifty percent of the soil points were at moderate and severe pollution levels, mainly in the coking and pellet plant area. The concentrations of 10 PAHs in 20 soil samples exceeded the Dutch target reference values. Compared with soil screening value of Beijing contaminated industrial sites, only part of the sample points exceeded the standard, typically benzo[a]anthracene(BaA) and benzo[a]pyrene(BaP). The source apportionment showed that soil PAHs mainly originated from combustion products of coal and other fossil fuels with only a small portion contributed by oil combustion and spill. The health risk assessment showed that the carcinogenic risks of benzo[a]pyrene(BaP), benzo[a]anthracene(BaA), dibenz(a,h)anthracene(DBA), benzo[b]fluoranthene(BbF), indeno[1,2,3-cd]pyrene(InP) exceeded the threshold of 1×10 under residential land condition, the carcinogenic risks of benzo[a]pyrene(BaP), benzo[a]anthracene(BaA), dibenz(a,h)anthracene(DBA) also exceeded the threshold of 1×10 under industrial land condition. The carcinogenic risk value of benzo[a]pyrene(BaP) was the biggest among the 16 PAHs. The soil PAHs in the steel enterprise already caused harm to human health and the soil restoration project must be carried out.