The mass concentration of 16 polycyclic aromatic hydrocarbons (PAHs) in PM2.5 in Shenyang during 2016 was quantitatively analyzed by gas chromatography-mass spectrometry. The spatiotemporal distribution characteristic and the sources of PAHs were discussed. The results showed that the average mass concentration of PAHs was 71.5 ng/m^3 . 3-ring and 4-ring PAHs accounted for 31.3% and 48.8%, respectively. The concentration of PAHs in heating period was significantly greater than that in non-heating season. In the central urban area, the concentration was higher than that in surrounding area. The average of total toxicity equivalent concentration was 8.05 ng/m^3 . The results of source apportionment by characteristic ratio method and principal component analysis were basically the same. Combustion, oil volatilization and industrial production were the main sources with the contribution rate of 70.11%, 14.19% and 10.74%, respectively.
The Administration and Technique of Environmental Monitoring