Levels and Sources of PAHs in Air-borne PM_2.5 of Hefei City, China

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• 作者：Ruoyu Hu ; Guijian Liu ; Hong Zhang…
• 关键词：Polycyclic aromatic hydrocarbons ; PM2.5 ; Meteorology ; Sources apportionment
• 刊名：Bulletin of Environmental Contamination and Toxicology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：98
• 期：2
• 页码：270-276
• 全文大小：
• 刊物主题：Pollution, general; Environmental Health; Ecotoxicology; Soil Science & Conservation; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution;
• 出版者：Springer US
• ISSN：1432-0800
• 卷排序：98

文摘

This work studied the concentrations and sources of polycyclic aromatic hydrocarbons (PAHs) in air-borne particulate matter of Hefei, China. Samples of PM_2.5 were collected daily at two sites during May, 2014, and January, 2015. The average daily concentration of PM_2.5 was 96.88 µg m−3, which is higher than the 2012 China Ambient Air Quality Standard (GB3095-2012 24-h grade II) of 75 µg m−3. The concentrations of 16 EPA priority polycyclic aromatic hydrocarbons (PAHs) were analyzed by gas chromatography-mass spectrometry. The PM_2.5-bound PAH concentrations ranged from 4.92 to 71.00 ng m−3 (mean = 21.34 ng m−3), and exhibited obvious seasonal (31.38 ng m−3 in winter and 14.05 ng m−3 in summer) and spatial variability (27.23 ng m−3at site ME and 18.20 ng m−3 at site MS). Meteorological conditions such as ambient temperature, wind speed and humidity had influences on the concentrations of PAHs. As an index for PAH carcinogenicity, the annual average concentration of benzo(a)pyrene ranged from 0.46 to 2.31 ng m−3, with a mean of 1.15 ng m−3. This mean was lower than the China Ambient Air Quality Standard (GB3095-2012) of 2.5 ng m−3. The diagnostic PAH ratios and principal component analysis (PCA) suggested that combustion of coal and vehicle emissions were the main sources of PAHs in PM_2.5.