Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/7272
Título: Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
Autor: Oliveira, Cesar
Martins, Natercia
Mirante, Fatima
Caseiro, Alexandre
Pio, Casimiro
Matos, Manuel
Silva, Hugo F.
Oliveira, Cristina
Camões, Filomena
Palavras-chave: Size-segregated particles
Road tunnel
Urban background
Data: Fev-2016
Editora: Elsevier
Citação: ALVES, Celia A.[et al] - Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter. Atmospheric Research. ISSN: 0169-8095. Vol. 168, (2016), pp.139-148..
Resumo: Particulate matter samples were collected in a road tunnel in Lisbon (PM0.5, PM0.5-1, PM1-2.5, and PM2.5-10) and at two urban locations representing roadside and background stations (PM2.5 and PM2.5-10). Samples were analysed for organic and elemental carbon (OC and EC), n-alkanes, n-alkenes, hopanes, some isoprenoid compounds, and steranes. Particulate matter concentrations in the tunnel were 17-31 times higher than at roadside in the vicinity, evidencing an aerosol origin almost exclusively in fresh vehicle emissions. PM0.5 in the tunnel comprised more than 60% and 80% of the total OC and EC mass in PM10, respectively. Concentrations of the different aliphatic groups of compounds in the tunnel were up to 89 times higher than at roadside and 143 times higher than at urban background. Based on the application of hopane-to-OC or hopanes-to-EC ratios obtained in the tunnel, it was found that vehicle emissions are the dominant contributor to carbonaceous particles in the city but do not represent the only source of these triterpenic compounds. Contrary to what has been observed in other studies, the Sigma hopane-to-EC ratios were higher in summer than in winter, suggesting that other factors (e.g. biomass burning, dust resuspension, and different fuels/engine technologies) prevail in relation to the photochemical decay of triterpenoid hydrocarbons from vehicle exhaust
Peer review: yes
URI: http://hdl.handle.net/10400.21/7272
DOI: 10.1016/j.atmosres.2015.09.007
ISSN: 0169-8095
Versão do Editor: http://ac.els-cdn.com/S0169809515002859/1-s2.0-S0169809515002859-main.pdf?_tid=ce7880e2-5cab-11e7-8acd-00000aab0f01&acdnat=1498728043_1ff1271584fc3544ea8febc08c9ec61e
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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