Determination of aerosol yields from 3-methylcatechol and 4-methylcatechol ozonolysis in a simulation chamber |
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| Authors: | Cécile Coeur-Tourneur Valentine Foulon Michel Laréal |
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| Institution: | 1. Laboratoire de Physico-Chimie de l''Atmosphère, UMR CNRS 8101, Université du Littoral Côte d''Opale, 32 avenue Foch, 62 930 Wimereux, France;2. Université du Littoral Côte d''Opale, 32 avenue Foch, 62 930 Wimereux, France;1. School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK;2. Department of Biochemistry, Oxford University, Oxford OX1 3QU, UK;3. Department of Biological Sciences, Durham University, Durham DH1 3LE, UK;1. Institute of Chemical Kinetics and Combustion, Institutskaya Str. 3, Novosibirsk, Russia;2. Novosibirsk State University, Pirogova Str. 2, Novosibirsk, Russia;3. Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium;4. Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Faculté des Sciences, Université libre de Bruxelles (ULB), 50 ave. F-D Roosevelt, B-1050 Brussels, Belgium;5. Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada;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 |
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| Abstract: | Secondary Organic Aerosol (SOA) formation during the ozonolysis of 3-methylcatechol (3-methyl-1,2-dihydroxybenzene) and 4-methylcatechol (3-methyl-1,2-dihydroxybenzene) was investigated using a simulation chamber (8 m3) at atmospheric pressure, room temperature (294 ± 2 K) and low relative humidity (5–10%). The initial mixing ratios were as follows (in ppb): 3-methylcatechol (194–1059), 4-methylcatechol (204–1188) and ozone (93–531). The ozone and methylcatechol concentrations were followed by UV photometry and GC–FID (Gas chromatography–Flame ionization detector), respectively and the aerosol production was monitored using a SMPS (Scanning Mobility Particle Sizer). The SOA yields (Y) were determined as the ratio of the suspended aerosol mass corrected for wall losses (Mo) to the total reacted methylcatechol concentrations assuming a particle density of 1.4 g cm?3. The aerosol formation yield increases as the initial methylcatechol concentration increases, and leads to aerosol yields ranging from 32% to 67% and from 30% to 64% for 3-methylcatechol and 4-methylcatechol, respectively. Y is a strong function of Mo and the organic aerosol formation can be expressed by a one-product gas/particle partitioning absorption model. These data are comparable to those published in a recent study on secondary organic aerosol formation from catechol ozonolysis. To our knowledge, this work represents the first investigation of SOA formation from the ozone reaction with methylcatechols. |
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