Photochemical aerosol formation from aromatic hydrocarbons in the presence of NOx |
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| Institution: | 1. Environment Research Institute, Shandong University, Qingdao, 266237, China;2. Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan;3. Department of Chemistry, University of California at Irvine, Irvine, CA, USA;4. Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, Jiangsu, 210093, China;1. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control & Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China;2. CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin 300350, China;3. Department of Public Health Sciences, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA;4. Institute for a Sustainable Environment, Clarkson University, Potsdam, NY 13699, USA;1. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control & Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China;2. CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin, 300350, China;3. Department of Public Health Sciences, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA;4. Institute for a Sustainable Environment, Clarkson University, Potsdam, NY, 13699, USA |
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| Abstract: | By using a 4-m3 chamber, photochemical aerosol formation from mixtures of aromatic hydrocarbons (AHCs) and nitrogen oxides (NOx) was studied with the main purpose of determining the aerosol yield. Altogether, 18 aromatic species were investigated, including toluene, xyluene, xylenes, ethylbenzene and methoxybenzene. Evolution of the aerosol was monitored through the measurement of the total number (CN]) and volume (V) concentrations. Aerosol-forming potential of different aromatics was examined in terms of the maximum growth rates of CN] and V. By putting dry sheath air into an electrical aerosol analyzer, the net organic volume concentration (Vd) was obtained; then a relation was established between Vd and the C mass concentration, and was used to determine the aerosol yield as defined by the ratio of the particulate C mass to the C mass of the reacted HC. It was found that the yields were larger for toluene, ethylbenzene, and o- and m-ethyltoluene (3.0, 3.1, 3.3 and 3.7%, respectively) but smaller for para-substituted toluene derivatives (< 1.5%). |
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