Pollution level and source apportionment of polycyclic aromatic hydrocarbons in atmospheric PM2.5 in Hefei city
LI Si-sheng1, SHAN Xiao-mei2, CHANG Jun-rui3, GE Cheng-xiang1, LI Chang-an1
1. Hefei Municipal Center for Disease Control and Prevention,Hefei, Anhui 230061, China; 2. Anhui Provincial Center for Disease Control and Prevention, Hefei, Anhui 230601, China; 3. National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing 100021, China
Abstract：Objective To analyze the pollution level and source apportionment of polycyclic aromatic hydrocarbons (PAHs) in atmospheric PM2.5 in Hefei city, and to provide a scientific basis for control and management of atmospheric PAHs pollution in Hefei city. Methods High performance liquid chromatography-fluorescence detector-PDA was used to detect the concentration of atmospheric PAHs in PM2.5 samples collected in Hefei city from February 2018 to January 2019. Three kinds of analytical methods, including characteristic ratio, principal component analysis (PCA) and positive definite matrix factorization (PMF) model, were employed to perform source apportionment of PAHs. Results The annual average concentration of Σ16PAHs in atmospheric PM2.5 in Hefei city was (9.25±6.72) ng/m3, and the annual average concentration of 7 kinds of carcinogenic ΣcPAHs was (4.67±3.88) ng/m3. The results of the source apportionment by characteristic ratio method, PCA and PMF model were basically similar. Gasoline and diesel combustion, coke combustion, coal combustion and biomass combustion were the main sources of PAHs in atmospheric PM2.5 in Binhu new district, with the contribution rates being 43.07%, 15.21%, 11.24% and 10.93%, respectively. Gasoline and diesel combustion, coal combustion, coke combustion and biomass combustion were the main sources of PAHs in atmospheric PM2.5 in Yaohai district, with the contribution rates being 45.93%, 16.49%, 11.73% and 10.08%, respectively. There existed some differences in the main sources of PAHs between urban area (Yaohai district) and suburban area(Binhu new district) in Hefei city. Conclusions The total pollution level of PAHs in atmospheric PM2.5 in Hefei city is relatively low, and the main sources of PAHs are traffic petroleum and diesel combustion.
2020, Vol. 27 
