Source Apportionment of Polycyclic Aromatic Hydrocarbons in the Topsoil of Tianjin
天津表层土壤中多环芳烃的主要来源

The sources of PAHs in the topsoil were apportioned using principal component analysis with multiple linear regression.Three sub-regions with significant differences in PAH levels and profiles were investigated individually.The results indicated that coal combustion and coking production were the dominate PAH source for the entire Tianjin,particularly for Tanggu-Hangu region with the highest PAH level,to which 79% of PAHs came from coal combustion and coking industry and 21% was from vehicles.For the city center and outskirts,vehicles and coal burning contributed 35% each,while incineration provided 21% of the total. Sources of PAHs in rural soil with relatively low level of PAHs were more diverse.In addition to coal,vehicles,and coking,straw burning added 11% to the total.The results based on the source apportionment were compared with those from emission modeling.