Effects of temperature on wood soot pah decay in atmospheres with sunlight and low NOx |
| |
| Institution: | 1. King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center, Thuwal 23955-6900, Saudi Arabia;2. Key Laboratory for Power Machinery and Engineering of Ministry of Education, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. Combustion Research Facility, Sandia National Laboratories, P. O. Box 969, MS 9055, Livermore, CA 94551, USA;2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;3. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;4. Department of Chemistry, University of California, Berkeley, CA 94720, USA;5. Departments of Chemical Engineering, Biomedical Engineering, Macromolecular Science and Engineering, Biophysics Program, University of Michigan, Ann Arbor, MI 48109, USA;1. Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge CB3 0AS, United Kingdom;2. CARES, Cambridge Centre for Advanced Research and Education in Singapore, 1 Create Way, CREATE Tower, #05-05, 138602, Singapore;3. Escuela de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Medellín, Calle 59 A No 63-20, Medellén, Colombia;4. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459 Singapore;1. Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA;2. ExxonMobil Research and Engineering, 1545 Route US 22 East, Annandale, N.J. 08801, USA;3. SABIC, Geleen Technology Center, Urmonderbaan 22, 6167 RD Geleen, The Netherlands;4. Laboratory for Chemical Technology, Ghent University, Technologiepark 914, B-9052 Gent, Belgium;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. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
| |
| Abstract: | Wood smoke particles were exposed to midday sunlight in outdoor Teflon film chambers. Chamber NO2 concentrations were limited to 0.03 ppm, and less than 0.01 ppm of photochemically generated ozone was produced. The overall initial rate of PAH decay on soot particles could be approximated by a first order rate expression. At moderate temperatures (~ 20°C) the rate of PAH decay on soot particles was appreciable with atmospheric half-lives of individual PAH in the range of 30–60 min. At temperatures of −7°C the rates of decay were substantially slower with half-lives that extended to many hours if not days. When outdoor temperatures changed from 20°C to −7°C the rate of decay of six different PAH decreased by a factor of four to ten. These experiments strongly suggest that the magnitude of PAH decay on soot particles due to photo-induced processes can be strongly influenced by temperature. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
