Distribution and sources of polycyclic aromatic hydrocarbon (PAHs) pollutants in soils of Yanhe River basin, north of Shaanxi province
LI Qi1,2，HUANG Ting-lin2，SHANG Xiao-qing1，XUE Ke-she1
（1 College of Urban and Environmental Sciences, Northwest University, Xi′an 710127,Shaanxi, China; 2 School of Environmental and Municipal Engineering, Xi′an University of Architecture &Technology, Xi′an 710055,Shaanxi, China）
Abstract:
On the basis of 16 surface soil samples collected from 4 types of land in the Yanhe River basin, north of Shaanxi province, the concentrations and component characteristics of 16 polycyclic aromatic hydrocarbons (PAHs) which have been being prior controlled by USEPA were analyzed using GC-MS. The results show that the maximum PAHs concentration in all soil samples was 1 795.4 μg/kg with a minimum value of 73.7 μg/kg. For residues of PAHs in the soil, it was characterized by well field soil> soil around road> soil around the well site> agricultural soil. However, the soil pollution with higher residual concentration of PAHs was not serious. The main component of PAHs from soil sample in the study area is mainly formed by two-ring hydrocarbons. In general, the PAHs content in soil ranged as follows: two-ring＞four-ring＞three-ring ＞five-ring＞six-ring. Evaporation or leakage of oil had a significantly cumulative effect on PAHs in the soil.
KeyWords:
soil; polycyclic aromatic hydrocarbons (PAHs); distribution characteristics; Yanhe River basin
