FT-IR product study of the OH-initiated oxidation of DMS in the presence of NOx |
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| Institution: | 1. Bergische Universität Gesamthochschule Wuppertal, Physikalische Chemie FB 9, Gaußstr. 20, 42907 Wuppertal, Germany;2. University of Crete, Department of Chemistry, P.O. Box 1470, 71409 Heraklion, Greece;1. Department of Environmental and Molecular Toxicology, Oregon State University, 1011 ALS Bldg., Corvallis, OR, 97331, United States;2. Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331, United States;1. Institute of High-Temperature Electrochemistry of Ural Branch of RAS, 620137, Akademicheskaya St., 20, Ekaterinburg, Russia;2. Ural Federal University Named After the First President of Russia B.N.Yeltsin, 620002, Mira St., 19, Ekaterinburg, Russia;1. UCCS UMR-CNRS 8181, Université de Lille1, Villeneuve d''Ascq, France;2. LASIR UMR-CNRS 8516, Université de Lille1, Villeneuve d''Ascq, France;1. Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, 532 10, Pardubice, Czech Republic;2. Université de Lille, UCCS, UMR CNRS 8181, 59655, Villeneuve d''Ascq, France;1. Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188, Japan;2. Department of Silicate Technology, University of Chemical Technology and Metallurgy, 8, Kl. Ohridski Blvd., Sofia 1756, Bulgaria |
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| Abstract: | The influence of NOx (NO+NO2) concentrations on the product distribution of the OH-initiated oxidation of DMS has been studied at room temperature using total NOx concentrations varying from 0 to ∼1800 ppbv (30–600 ppbv NO2 and 140–1760 ppbv NO). Clear trends in the formation yields of the products SO2, COS, MSA, MTF (methyl thiolformate), MSPN (methanesulphonyl peroxynitrate), DMSO and DMSO2 have been observed with variation in NOx. The presence of low levels of NO reduces the yields of both MTF and COS to zero. The formation yields of MSA and DMSO2 increase with increasing NOx concentration, whereas the yields of DMSO and SO2 decrease. The following approximate changes in the yield, not corrected for possible loss processes, have been measured for variation of NOx between 0 and ∼1800 ppbv: DMSO decreases from 20 to 3%S; DMSO2 increases from 3 to 15%S, SO2 decreases from 70 to 30%S and MSA increases from 4 to 17%S. Under the experiments conditions NOx levels of several tens of ppbv are required before a perceptible change is observed in the MSA yield. If applicable to the atmosphere such a situation is only likely to be observed near coastal areas affected by pollution. MSPN (CH3SO2O2NO2) is observed as an oxidation product in the presence of NO2 even at low levels (e.g. 60 ppbv). Its possible role as a NOx reservoir in the troposphere is considered. |
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