Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter

Detalhes bibliográficos
Autor(a) principal: Oliveira, Cesar
Data de Publicação: 2016
Outros Autores: Martins, Natercia, Mirante, Fátima, Caseiro, Alexandre, Pio, Casimiro, Matos, Manuel, Silva, Hugo, Oliveira, Cristina, Camões, Filomena
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.21/7272
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
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spelling Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matterSize-segregated particlesHopanesAlkanesRoad tunnelRoadsideUrban backgroundParticulate 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 exhaustElsevierRCIPLOliveira, CesarMartins, NaterciaMirante, FátimaCaseiro, AlexandrePio, CasimiroMatos, ManuelSilva, HugoOliveira, CristinaCamões, Filomena2017-07-14T09:29:19Z2016-022016-02-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/7272engALVES, 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.139-1480169-809510.1016/j.atmosres.2015.09.007metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T09:53:07Zoai:repositorio.ipl.pt:10400.21/7272Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:16:15.275721Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
title Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
spellingShingle Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
Oliveira, Cesar
Size-segregated particles
Hopanes
Alkanes
Road tunnel
Roadside
Urban background
title_short Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
title_full Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
title_fullStr Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
title_full_unstemmed Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
title_sort Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
author Oliveira, Cesar
author_facet Oliveira, Cesar
Martins, Natercia
Mirante, Fátima
Caseiro, Alexandre
Pio, Casimiro
Matos, Manuel
Silva, Hugo
Oliveira, Cristina
Camões, Filomena
author_role author
author2 Martins, Natercia
Mirante, Fátima
Caseiro, Alexandre
Pio, Casimiro
Matos, Manuel
Silva, Hugo
Oliveira, Cristina
Camões, Filomena
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv RCIPL
dc.contributor.author.fl_str_mv Oliveira, Cesar
Martins, Natercia
Mirante, Fátima
Caseiro, Alexandre
Pio, Casimiro
Matos, Manuel
Silva, Hugo
Oliveira, Cristina
Camões, Filomena
dc.subject.por.fl_str_mv Size-segregated particles
Hopanes
Alkanes
Road tunnel
Roadside
Urban background
topic Size-segregated particles
Hopanes
Alkanes
Road tunnel
Roadside
Urban background
description 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
publishDate 2016
dc.date.none.fl_str_mv 2016-02
2016-02-01T00:00:00Z
2017-07-14T09:29:19Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.21/7272
url http://hdl.handle.net/10400.21/7272
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 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
0169-8095
10.1016/j.atmosres.2015.09.007
dc.rights.driver.fl_str_mv metadata only access
info:eu-repo/semantics/openAccess
rights_invalid_str_mv metadata only access
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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