Polycyclic Aromatic Hydrocarbon Sources Identification in Surface Soils from Tianjin Area
天津地区表层土壤多环芳烃类污染物污染源辨析

Based on plant cover, history of wastewater irrigation, landscape status and other geographic entities, the sample sites were classified into farmland of wastewater irrigation, common farmland, wild land, oil field and city greenbelt. The uniform gridding scatter sampling method was adopted to collect 188 surface soil samples, which were exacted from varions matrixes, foilwed by some clean up procedures and then analyzed by GL/MS. Using the PAH data collected from surface soils of Tianjin, accordingto the factor analysis and scatter point surface tension spline function interpolation, some types and spatial distributions of pollution sources of PAHs of soil in Tianjin area were investigated and discussed in this paper. The result showed that most types of pollution source are mixed sources, including coal combustion and oil spill in surface soils of different types of soil utilization in Tianjin area. Mixed sources occupy 61.26%, 69.35%, 52.86% and 64.45% in farmland of wastewater irrigation, common farmland, wild land, and city greenbelt, respectively, and the spatial distributions of pollution sources are closely related with their geographic locations, geographic conditions and living habits of indigenes.