Identification and quantification of ozonation products of anthracene and phenanthrene adsorbed on silica particles |
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| Institution: | 1. Geographic Institute, University of Berne, Hallerstrasse 12, 3012 Berne, Switzerland;2. Geoecology, University of Tübingen, Rümelinstrasse 19-23, 72070 Tübingen, Germany;3. Ecología Terrestre, Centro Nacional Patagónico (CENPAT), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Boulevard Brown 2825, U9120ACF Puerto Madryn, Argentina;1. Instituto de Química de San Luis (CCT-San Luis)—Área de Química Analítica, Facultad de Química Bioquímica y Farmacia, Universidad Nacional de San Luis, Laboratorio de Espectrometría de Masas, Bloque III, Ejército de los Andes 950, San Luis CP5700, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina;3. Comisión Nacional de Energía Atómica, Gerencia Química, Av. Gral. Paz 1499, B1650KNA-San Martín, Pcia., Buenos Aires, Argentina |
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| Abstract: | Primary products of the reactions of gas-phase ozone with anthracene and phenanthrene adsorbed on silica model particles have been investigated. Silica was selected as proxy for mineral atmospheric particles. The particles, coated with anthracene or phenanthrene and placed on a filter, were exposed in a reaction cell to a gaseous ozone flow. Ozone concentration was constant ((6.0±0.6)×1013 molecule cm?3) during the experiments. Anthracene, phenanthrene and their ozonation products were then extracted by focused microwave-assisted extraction or fluid pressurized extraction and analyzed by gas chromatography coupled to mass spectrometry. Anthraquinone and anthrone on the one hand, and 1,1′-biphenyl-2,2′-dicarboxaldehyde on the other hand were identified as the products of anthracene and phenanthrene, respectively and quantified versus time of ozone exposure. This kinetical approach allowed to show that anthraquinone, anthrone and 1,1′-biphenyl-2,2′-dicarboxaldehyde are the primary products of the studied reactions, and to determine their formation yields (respectively, 0.42±0.04, 0.056±0.005 and 1.0±0.4). |
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