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The reaction between dimethyl sulphide (DMS) and the nitrate radical NO(3) in dark air was studied in a Teflon bag, monitoring products formed in the gas phase together with aerosol composition and size distributions in the course of the experiment. The condensable products methane sulphonic acid (MSA) and sulphuric acid H(2)SO(4) formed via a gaseous, relatively stable PAN-like peroxynitrate intermediate (MSPN) which can build up to concentrations in the gas phase that are a multiple of MSA and H(2)SO(4). A coupled gas chemistry-aerosol dynamics model was fitted to the experimental data and led to a consistent description of the partitioning of the S-containing products (SO(2), MSPN, MSA and H(2)SO(4)) over gas and aerosol phase. The chemical model predicts that MSPN might be an important reservoir species for nitrogen and sulphur, and for aerosol formation in marine regions that are impacted by NO(x)-rich air masses.

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Authors: VAN DINGENEN R, JRC Ispra (IT);JENSEN N R, JRC Ispra (IT);HJORTH J, JRC Ispra (IT);RAES F, JRC Ispra (IT)
Bibliographic Reference: Article: Journal of Atmospheric Chemistry, Vol. 18 (1994) pp. 211-237
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