Effect of high concentrations of inorganic seed aerosols on secondary organic aerosol formation in the m-xylene/NOx photooxidation system |
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| Authors: | Zifeng Lu Jiming Hao Hideto Takekawa Lanhua Hu Junhua Li |
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| Institution: | 1. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;2. Engine Combustion and Environment Laboratory, Mechanical Engineering Department, Toyota Central Research and Development Laboratory, Nagakute, Aichi 480-1192, Japan;1. Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, FL, USA;2. Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida, Gainesville, FL, USA;1. Department of Chemistry and Biomolecular Sciences, Macquarie University, NSW 2109, Australia;2. CSIRO Energy Technology, PO Box 52, North Ryde, NSW 1670, Australia;1. School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China;2. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;1. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;4. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;5. Institut de Recherches sur la Catalyse et l''Environment de Lyon (IRCELYON), CNRS, UMR5256, Villeurbanne F-69626, France |
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| Abstract: | High concentrations (>15 μm3 cm?3) of CaSO4, Ca(NO3)2 and (NH4)2SO4 were selected as surrogates of dry neutral, aqueous neutral and dry acidic inorganic seed aerosols, respectively, to study the effects of inorganic seeds on secondary organic aerosol (SOA) formation in irradiated m-xylene/NOx photooxidation systems. The results indicate that neither ozone formation nor SOA formation is significantly affected by the presence of neutral aerosols (both dry CaSO4 and aqueous Ca(NO3)2), even at elevated concentrations. The presence of high concentrations of (NH4)2SO4 aerosols (dry acidic) has no obvious effect on ozone formation, but it does enhance SOA generation and increase SOA yields. In addition, the effect of dry (NH4)2SO4 on SOA yield is found to be positively correlated with the (NH4)2SO4 surface concentration, and the effect is pronounced only when the surface concentration reaches a threshold value. Further, it is proposed that the SOA generation enhancement is achieved by particle-phase heterogeneous reactions induced and catalyzed by the acidity of dry (NH4)2SO4 seed aerosols. |
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