| Title: | "Evolution of aerosol chemistry in Beijing under strong influence of anthropogenic pollutants: Composition, sources, and secondary formation of fine particulate nitrated aromatic compounds" |
| Author(s): | Ren Y; Wei J; Wang G; Wu Z; Ji Y; Li H; |
| Address: | "State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Electronic address: renyq@craes.org.cn. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China. Key Lab of Geographic Information Science of Ministry of Education of China, School of Geographic Sciences, East China Normal University, Shanghai, 200142, China; Institute of Eco-Chongming, 3663 N. Zhongshan Rd., Shanghai, 200062, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Electronic address: lihong@craes.org.cn" |
| DOI: | 10.1016/j.envres.2021.111982 |
| ISSN/ISBN: | 1096-0953 (Electronic) 0013-9351 (Linking) |
| Abstract: | "Nitrated aromatic compounds (NACs) constitute a key segment of brown carbon (BrC), thereby contributing to the light-absorbing characteristics of aerosols in the atmosphere. However, until recently, there is a scarcity of research on their generation in the urban environment. The current study is based upon an extensive field study of NACs from fine particle samples obtained at an urban location in Beijing in the spring and summer of 2017, which was characterized by both high anthropogenic volatile organic compounds (VOCs) and high-NO(x) dominated conditions. The mean total concentration of the nine NACs was 8.58 ng m(-3) in spring and 8.54 ng m(-3) in summer. In the spring, the most abundant NACs were 4-nitrophenol (33.7%) and 4-nitrocatechol (19.3%), while in the summer, the most abundant NACs were 4-nitroguaiacol (34.9%) and 2, 4-dinitrophenol (23%). Atmospheric NACs were primarily produced from coal combustion (52%) and biomass burning (32%) in spring, and originated from the secondary formation (37%) and traffic (35%) in summer. NO(2) could promote the formation of NACs with a significant effect on their compositions, especially for nitrophenols and nitrocatechols. It can also affect the formation of nitrated aerosols and their existing form. Inorganic nitrates were increased to conversion in the daytime when NO(2) concentrations were higher than 30 ppb, but the corresponding oxidation products shifted to primarily organic ones at night. The transition was VOC-sensitive regimes for NAC formation, and nitration of toluene was a more important pathway during the campaign in Beijing" |
| Keywords: | Aerosols/analysis *Air Pollutants/analysis Beijing China Coal Environmental Monitoring *Environmental Pollutants Particulate Matter/analysis Seasons *Volatile Organic Compounds Fine particle matter NO(x) Nitrated aromatic compounds Secondary formation Sou; |
| Notes: | "MedlineRen, Yanqin Wei, Jie Wang, Gehui Wu, Zhenhai Ji, Yuanyuan Li, Hong eng Research Support, Non-U.S. Gov't Netherlands 2021/09/04 Environ Res. 2022 Mar; 204(Pt A):111982. doi: 10.1016/j.envres.2021.111982. Epub 2021 Sep 1" |
