Source Apportionment and Health Risk Assessment of Polycyclic Aromatic Hydrocarbons in PM2.5 in Changchun City, Autumn of 2017

ZHANG Yi-xuan1,2 CAO Fang1,2 ZHENG Han1,2 ZHANG Dong-dong1,2 ZHAI Xiao-yao1,2 FAN Mei-yi1,2 ZHANG Yan-lin1,2

(1.Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China 210044)
(2.Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science &Technology, Nanjing, China 210044)

【Abstract】In this study, 30 PM2.5 samples were collected from the atmosphere in Changchun City in the autumn of 2017. The concentration and composition characteristics of 17 polycyclic aromatic hydrocarbons (PAHs) in the samples were analyzed by gas chromatography mass spectrometry (GC-MS). The diagnostic ratio and principal component analysis (PCA) method were used to determine the source of PAHs pollution. The health risk assessment was carried out by both calculating the equivalent carcinogenic concentration of benzo(a)pyrene and the lifetime risk of cancer. Results show that the average PM2.5 concentration in autumn in Changchun is (50.84 ± 12.23) μg·m−3, and the concentration of organic carbon (OC) and elemental carbon (EC) are (17.07 ± 5.64) μg·m−3 and (1.33 ± 0.75) μg·m−3, respectively, accounting for 37% of the total PM2.5. The total concentration of PAHs is (15.69 ± 5.93) ng·m−3, which is dominated by medium- to high-ring-number PAHs, accounting for 84.26% of total PAHs. The atmospheric PAHs in Changchun mainly originate from motor vehicle exhaust emissions (44.48%) > coal combustion (29.16%) > biomass burning (26.36%), local transportation (gasoline vehicles) emissions being the main source of pollution. The average carcinogenic concentration of benzo(a)pyrene is in the range of 1.55 ng·m−3 and 5.38 ng·m−3, and the average carcinogenic equivalent concentration is (6.44 ± 1.53) ng·m−3, which is generally considered a slight pollution level. The ingestion of PAHs by breathing is the most harmful to the health of adult women, followed by adult males and children. However, since the lifetime carcinogenic risk value of the entire population did not exceed 1 × 10 –6, their health risks are considered to be at acceptable levels.

【Keywords】 Changchun; PM2.5; polycyclic aromatic hydrocarbons; source analysis; health risks;

【DOI】

【Funds】 National Key R&D Program (2017YFC0212302) National Natural Science Foundation of China (91644103, 41603104) Natural Science Funds for Distinguished Young Scholar of Jiangsu Province (BK20180040)

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This Article

ISSN:0250-3301

CN: 11-1895/X

Vol 41, No. 02, Pages

February 2020

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Abstract

  • 1 Materials and methods
  • 2 Results and discussion
  • 3 Conclusions
  • References