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Insights into the Formation and Evolution of Individual Compounds in the Particulate Phase during Aromatic Photo-Oxidation.
Pereira, Kelly L; Hamilton, Jacqueline F; Rickard, Andrew R; Bloss, William J; Alam, Mohammed S; Camredon, Marie; Ward, Martyn W; Wyche, Kevin P; Muñoz, Amalia; Vera, Teresa; Vázquez, Mónica; Borrás, Esther; Ródenas, Milagros.
Afiliación
  • Pereira KL; Wolfson Atmospheric Chemistry Laboratory, Department of Chemistry, University of York , York, YO10 5DD, United Kingdom.
  • Hamilton JF; Wolfson Atmospheric Chemistry Laboratory, Department of Chemistry, University of York , York, YO10 5DD, United Kingdom.
  • Rickard AR; Wolfson Atmospheric Chemistry Laboratory, Department of Chemistry, University of York , York, YO10 5DD, United Kingdom.
  • Bloss WJ; National Centre for Atmospheric Science, University of York , York, YO10 5DD, United Kingdom.
  • Alam MS; School of Geography, Earth and Environmental Sciences, University of Birmingham , Birmingham, B15 2TT, United Kingdom.
  • Camredon M; School of Geography, Earth and Environmental Sciences, University of Birmingham , Birmingham, B15 2TT, United Kingdom.
  • Ward MW; LISA, UMR CNRS/INSU 7583, University of Paris-Est Créteil and Paris Diderot , Créteil, 94010, France.
  • Wyche KP; Wolfson Atmospheric Chemistry Laboratory, Department of Chemistry, University of York , York, YO10 5DD, United Kingdom.
  • Muñoz A; Air Environment Research, School Environment and Technology, University of Brighton , Brighton, BN2 4AT, United Kingdom.
  • Vera T; CEAM-UMH, EUPHORE, Valencia, 46980, Spain.
  • Vázquez M; CEAM-UMH, EUPHORE, Valencia, 46980, Spain.
  • Borrás E; CEAM-UMH, EUPHORE, Valencia, 46980, Spain.
  • Ródenas M; CEAM-UMH, EUPHORE, Valencia, 46980, Spain.
Environ Sci Technol ; 49(22): 13168-78, 2015 Nov 17.
Article en En | MEDLINE | ID: mdl-26473383
Secondary organic aerosol (SOA) is well-known to have adverse effects on air quality and human health. However, the dynamic mechanisms occurring during SOA formation and evolution are poorly understood. The time-resolved SOA composition formed during the photo-oxidation of three aromatic compounds, methyl chavicol, toluene and 4-methyl catechol, were investigated at the European Photoreactor. SOA was collected using a particle into liquid sampler and analyzed offline using state-of-the-art mass spectrometry to produce temporal profiles of individual photo-oxidation products. In the photo-oxidation of methyl chavicol, 70 individual compounds were characterized and three distinctive temporal profile shapes were observed. The calculated mass fraction (Ci,aer/COA) of the individual SOA compounds showed either a linear trend (increasing/decreasing) or exponential decay with time. Substituted nitrophenols showed an exponential decay, with the nitro-group on the aromatic ring found to control the formation and loss of these species in the aerosol phase. Nitrophenols from both methyl chavicol and toluene photo-oxidation experiments showed a strong relationship with the NO2/NO (ppbv/ppbv) ratio and were observed during initial SOA growth. The location of the nitrophenol aromatic substitutions was found to be critically important, with the nitrophenol in the photo-oxidation of 4-methyl catechol not partitioning into the aerosol phase until irradiation had stopped; highlighting the importance of studying SOA formation and evolution at a molecular level.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Material Particulado / Hidrocarburos Aromáticos / Luz Idioma: En Revista: Environ Sci Technol Año: 2015 Tipo del documento: Article País de afiliación: Reino Unido Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Material Particulado / Hidrocarburos Aromáticos / Luz Idioma: En Revista: Environ Sci Technol Año: 2015 Tipo del documento: Article País de afiliación: Reino Unido Pais de publicación: Estados Unidos