Atmospheric reactions of ortho cresol: Gas phase and aerosol products

Abstract Photo-oxidation of ortho-cresol (0.5–1.1 ppm) and oxides of nitrogen (0.12–0.66 ppm) in air yielded the following gas-phase products: pyruvic acid, acetaldehyde, formaldehyde, peroxyacetylnitrate, nitrocresol and trace levels of nitric acid and methyl nitrate. particulate phase products included 2-hydroxy3-nitro toluene, 2-hydroxy-5-nitro toluene, 2-hydroxy-3,5-dinitrotoluene and, tentatively, several hydroxynitrocresol isomers. Yields of gas-phase products (0.8 % for pyruvic acid, 5–11 % for the sum of the aromatic ring fragmentation products) and of aerosol products (5–19% on a carbon basis, with particulate carbon formation rates of 30–80 μ g m −3 h −1 ) are discussed in terms of photochemical reaction pathways. From 60 to 89 % of the initial NO x was consumed in these reactions and a significant fraction of the reacted NO x could be accounted for as particulate nitro-aromatic products.

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