Hu Ruoyu, Liu Guijian, Zhang Hong, Xue Huaqin, Wang Xin
CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, China.
Bull Environ Contam Toxicol. 2017 Feb;98(2):270-276. doi: 10.1007/s00128-016-2019-9. Epub 2017 Jan 2.
This work studied the concentrations and sources of polycyclic aromatic hydrocarbons (PAHs) in air-borne particulate matter of Hefei, China. Samples of PM were collected daily at two sites during May, 2014, and January, 2015. The average daily concentration of PM was 96.88 µg m, which is higher than the 2012 China Ambient Air Quality Standard (GB3095-2012 24-h grade II) of 75 µg m. The concentrations of 16 EPA priority polycyclic aromatic hydrocarbons (PAHs) were analyzed by gas chromatography-mass spectrometry. The PM-bound PAH concentrations ranged from 4.92 to 71.00 ng m (mean = 21.34 ng m), and exhibited obvious seasonal (31.38 ng m in winter and 14.05 ng m in summer) and spatial variability (27.23 ng mat site ME and 18.20 ng m 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, with a mean of 1.15 ng m. This mean was lower than the China Ambient Air Quality Standard (GB3095-2012) of 2.5 ng m. 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.
本研究调查了中国合肥大气颗粒物中多环芳烃（PAHs）的浓度及来源。于2014年5月和2015年1月在两个采样点每日采集PM样本。PM的日均浓度为96.88μg/m³，高于2012年中国环境空气质量标准（GB3095 - 2012二级24小时均值）的75μg/m³。采用气相色谱 - 质谱联用仪分析16种美国环保署（EPA）优先控制的多环芳烃（PAHs）的浓度。与PM结合的PAH浓度范围为4.92至71.00 ng/m³（均值 = 21.34 ng/m³），呈现出明显的季节变化（冬季为31.38 ng/m³，夏季为14.05 ng/m³）和空间变化（ME采样点为27.23 ng/m³，MS采样点为18.20 ng/m³）。环境温度、风速和湿度等气象条件对PAHs的浓度有影响。作为PAH致癌性指标，苯并[a]芘的年均浓度范围为0.46至2.31 ng/m³，均值为1.15 ng/m³。该均值低于中国环境空气质量标准（GB3095 - 2012）的2.5 ng/m³。诊断性PAH比值和主成分分析（PCA）表明，煤燃烧和机动车排放是PM中PAHs的主要来源。
