Peng Chi, Wang Meie, Zhao Yun, Chen Weiping
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, People's Republic of China.
Environ Monit Assess. 2016 Mar;188(3):162. doi: 10.1007/s10661-016-5156-z. Epub 2016 Feb 15.
We investigated the sources, distribution, and health risks of polycyclic aromatic hydrocarbons (PAHs) in soils of peri-urban Beijing. The mean concentrations of total 16 PAHs in suburban and rural soils of Beijing were 321.8 ± 408.2 and 219.2 ± 233.5 ng/g, respectively. The PAH concentrations decreased along the urban-suburban-rural gradient and varied with land use categories. The industrial areas had the highest soil PAH concentrations followed by the living areas, roadsides, green areas, and agricultural areas. The major sources of PAHs in these soils were coal and biomass combustion. Traffic emission was not the dominant source of PAHs in peri-urban Beijing. At a few sites, high soil PAH contents were caused by point sources such as iron and steel plants and a wood preservative factory. The incremental lifetime cancer risks (ILCRs) of adults and children exposed to PAHs in the soils were acceptable. However, cautions should be paid to the abandoned industrial sites, which might be converted to residential area during the urbanization process.
我们调查了北京城郊土壤中多环芳烃（PAHs）的来源、分布及健康风险。北京郊区和农村土壤中16种PAHs的总平均浓度分别为321.8±408.2 ng/g和219.2±233.5 ng/g。PAH浓度沿城市-郊区-农村梯度降低，并随土地利用类型而变化。工业区土壤PAH浓度最高，其次是生活区、路边、绿地和农业区。这些土壤中PAHs的主要来源是煤炭和生物质燃烧。交通排放不是北京城郊PAHs的主要来源。在一些地点，土壤PAH含量高是由钢铁厂和木材防腐厂等点源造成的。成人和儿童接触土壤中PAHs的终生癌症风险增量（ILCRs）是可以接受的。然而，应注意那些废弃的工业场地，在城市化进程中它们可能会被转变为居民区。
