CHEN Zhangqi

Quanzhou Environmental Monitoring Station, Fujian Quanzhou 362000, China

Abstract: In order to understand the pollution characteristics and clarify the key pollution sources of PM2.5-bound PAHs, PM2.5 samples were collected at four sites (including Qingyuanshan, Tushanjie, Wanan and Donghai) in Quanzhou during February to October 2016. Total 19 selected PAHs were analyzed by the in-injection port thermal desorption (TD)-gas chromatography/mass spectrometry (GC/MS) procedure, temporal-spatial distribution and health risk assessment of PAHs was evaluated. The concentrations of PM2.5-bound PAHs in Quanzhou were 1.98±0.75 ng/m3, which was significantly lower than most cities in China. Seasonal variation of ∑PAHs concentrations was as following: winter>spring>summer >autumn, and spatial pattern of ∑PAHs pollution was as following: Tushanjie>Wanan>Donghai>Qingyuanshan. PAHs was mainly composed of 5-ring PAH with the percentage of 30%~38%, and the proportion of 3-ring, 4-ring and 6-ring were 18%~27%, 22%~25%, and 13~19%, respectively. According to PAH diagnostic ratios, coal burning and biomass burning were the major emission sources in summer and autumn, and fossil fuel burning (such as vehicle emissions) was the predominant source in winter and spring. The average lifetime cancer risks of PAHs for children and adults were 0.7×10-7 and 1.4×10-7, respectively. There is no carcinogenic risk of PM2.5-bound PAHs in Quanzhou city.

Keywords: PM2.5; PAHs; temporal-spatial characteristics; sources apportionment; health risk assessment

EARTH AND ENVIRONMENT Vol.47, No.3, Tot No.329, 2019, Page 275-282