Carbonyl atmospheric reaction products of aromatic hydrocarbons in ambient air |
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| Authors: | Genevieve Obermeyer Sara M Aschmann Roger Atkinson Janet Arey |
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| Institution: | 1. Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi''an Jiaotong University, No. 28 Xianning West Road, Xi''an, Shaanxi 710049, China;2. SKLLQG, Institute of Earth and Environment, CAS, Xi''an, Shaanxi 710075, China;3. Department of Civil and Environmental Engineering, Research Center for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;4. Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China;5. Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio Pathway, Reno, NV 89512, United States;6. Hong Kong Environmental Protection Department, 47/F, Revenue Tower, 5 Gloucester Road, Wan Chai, Hong Kong, China;7. Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;1. Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA;2. Department of Chemical and Environmental Engineering, UC Riverside, CA 92521, USA;3. College of Engineering, Center for Environmental Research and Technology, UC Riverside, CA 92507, USA;1. Department of Land, Air and Water Resources, University of California – Davis, 1 Shields Ave., Davis, CA, USA;2. Agricultural and Environmental Chemistry Graduate Group, University of California – Davis, 1 Shields Ave., Davis, CA, USA;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. School of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, China;3. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;4. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;5. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | To convert gaseous carbonyls to oximes during sampling, an XAD-4 resin denuder system pre-coated with O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine and followed by analysis with methane positive chemical ionization gas chromatography/mass spectrometry was used to measure carbonyls in ambient air samples in Riverside, CA. In conjunction with similar analyses of environmental chamber OH radical-initiated reactions of o- and p-xylene, 1,2,4-trimethylbenzene, ethylbenzene, 4-hydroxy-2-butanone and 1,4-butanediol, we identified benzaldehyde, o-, m- and p-tolualdehyde and acetophenone and the dicarbonyls glyoxal, methylglyoxal, biacetyl, ethylglyoxal, 1,4-butenedial, 3-hexene-2,5-dione, 3-oxo-butanal, 1,4-butanedial and malonaldehyde in the ambient air samples. As discussed, these carbonyls and dicarbonyls can be formed from the OH radical-initiated reactions of aromatic hydrocarbons and other volatile organic compounds emitted into the atmosphere, and we conclude that in situ atmospheric formation is a major source of these carbonyls in our Riverside, CA, ambient air samples. |
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