1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044, China;
3. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China
To investigate the characteristics and sources of haze pollution and the formation mechanism of sulfate the northern suburb of Nanjing,PM2.5 samples were collected in March 2016, and the concentrations of water-soluble ions (Na+, NH4+, K+, Ca2+, Mg2+, Cl-, NO3- and SO42-) and carbonaceous components (OE and EC) were measured. The average concentration of PM2.5 during the sampling period was (103.22±48.5)µg/m3. In contrast to clean days, the formation of secondary sulphate in the polluted days was much stronger related to the oxidation of SO2 by NO2 than the oxidation with O3. The mineral dust could serve as buffered agent and kept the aerosol in weakly alkaline state during polluted days, which was preferred for the secondary sulfate formation. In this work, the secondary organic carbon (SOC) in PM2.5 was mainly formed from the photooxidation of hydrocarbons with O3. The main sources of PM2.5 components in polluted days were motor vehicle emissions, followed by biomass and coal combustion. In clean days, the bulk components were mainly contributed by coal combustion and dust emission with little influences from motor vehicle exhaust.
赵云卿, 陈善莉, 朱彬, 郭照冰. 南京北郊早春霾污染过程及硫酸盐形成研究[J]. 中国环境科学, 2018, 38(7): 2438-2444.
ZHAO Yun-qing, CHEN Shan-li, ZHU Bin, GUO Zhao-bing. Investigation of haze pollution and the formation of sulfate in early spring in northern suburbs of Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2438-2444.
Zhou J B, Xing Z Y, Deng J J, et al. Characterizing and sourcing ambient PM2.5 over key emission regions in China I:Water-soluble ions and carbonaceous fractions[J]. Atmospheric Environment, 2016,135:20-30.
[2]
Zhou J B, Xiong Y, Xing Z Y, et al. Characterizing and sourcing ambient PM2.5 over key emission regions in China Ⅱ:Organic molecular markers and CMB modeling[J]. Atmospheric Environment, 2017,163:57-64.
[3]
Li H M, Wang Q G, Yang M, et al. Chemical characterization and source apportionment of PM2.5 aerosols in a megacity of Southeast China[J]. Atmospheric Research, 2016,181:288-299.
Tao J, Zhang L M, Ho K F, et al. Impact of PM2.5chemiPal compositions on aerosol light scattering in Guangzhou-the largest megacity in South China[J]. Atmospheric Research, 2014,135-136:48-58.
Seinfeld H J, Pandis N S. Atmospheric chemistry and physics:from air pollution to climate change[M]. New York:John Wiley & Sons, 1996:379-383.
[9]
Kang C M, Lee S H, Kang B W, et al. Chemical characteristics of acidic gas pollutants and PM2.5 species during hazy episodes in Seoul, South Korea[J]. Atmospheric Environment, 2004,38(28):4749-4760.
[10]
Wang Q Y, Cao J J, Shen Z X, et al. Chemical characteristics of PM2.5 during dust storms and air pollution events in Chengdu, China[J]. Particuology, 2013,11:70-77.
[11]
Gao J J, Tian Z H, Cheng K, et al. The variation of chemical characteristics of PM2.5 and PM10 and formation causes during two haze pollution events in urban Beijing, China[J]. Atmospheric Environment, 2015,107:1-8.
[12]
Hassan K S, Khoder I M. Chemical characteristics of atmospheric PM2.5 loads during air pollution episodes in Giza, Egypt[J]. Atmospheric Environment, 2017,150:346-355.
[13]
Cheng Y F, Zheng G J, Wei C, et al. Reactive nitrogen chemistry in aerosol water as a source of sulfate during haze events in China[J]. Science Advances, 2016,2(12).
[14]
Hung H M, Hoffmann R M. Oxidation of Gas-Phase SO2 on the Surfaces of Acidic Micro-Droplets:Implications for Sulfate and Sulfate Radical Anion Formation in the Atmospheric Liquid Phase[J]. Environmental Science & Technology, 2015,49(23):68-76.
[15]
Wang G H, Zhang R Y, Hernandez G M, et al. Persistent sulfate formation from London Fog to Chinese haze[J]. Proceedings of the National Academy Ofences of the United States of America, 2016, 113(48):13630.
[16]
Chow C J, Waston G J, Lu Z Q, et al. Descriptive analysis of PM2.5 and PM10 at regionally representative locations during SJVAQS/AUSPEX[J]. Atmospheric Environment, 1996,30(12):2079-2112.
[17]
Castro L M, Pio C A, Harrison R M, et al. Carbonaceous aerosol in urban and rural European atmospheres:estimation of secondary organic carbon concentrations[J]. Atmospheric Environment, 1999,33(17):2771-2781.
[18]
Arimoto R, Duce R A, Savoie D L, et al. Relationships among aerosol constituents from Asia and the North Pacific during Pem-West A[J]. Journal of Geophysical Research, 1996,101:2011-2023.
[19]
Li X G, Wang Y F, Guo X Q, et al. Size distribution and characterization of EC and OC in aerosols during the Olympics of Beijing, China[J]. Environmental Science, 2011,32(2):313-319.
