Ambient levels of carbonyl compounds and their sources in Guangzhou,China |
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| Institution: | 1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2. Environment Research Institute, Shandong University, Qingdao 266237, China;3. State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China;4. Fujian Academy of Environmental Sciences, Fuzhou 350013, China;5. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;1. Institut de Combustion, Aerothermique, Reactivité Environnement (ICARE), CNRS/OSUC 1C Avenue de la Recherche Scientifique, 45071 Orléans Cedex 02, France;2. College of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, China;3. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;1. School of the Environment, Guangxi University, Nanning 530004, China;2. College of the Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of the Agriculture and Security, Nanning College, Nanning 530200, China |
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| Abstract: | Ambient levels of carbonyl compounds and their possible sources, vehicular exhaust and cooking exhaust, were studied at seven places in Guangzhou, including five districts (a residential area, an industrial area, a botanical garden, a downtown area and a semi-rural area), a bus station and a restaurant during the period of June–September 2003. Nineteen carbonyl compounds were identified in the ambient air, of which acetone was the most abundant carbonyl, followed by formaldehyde and acetaldehyde. Only little changes were found in carbonyl concentration levels in the five different districts because of their dispersion and mixture in the atmosphere in summer. The lower correlations between the carbonyls’ concentrations might result from the mixture of carbonyls derived from different sources, including strong photochemical reactions at noon in summer. Formaldehyde and acetaldehyde were the main carbonyls in bus station, while straight-chain carbonyls were comparatively abundant in cooking exhaust. Besides vehicular exhaust, cooking might be another major source of carbonyl compounds in Guangzhou City, especially for high molecular weight carbonyls. |
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