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

2016-02Journal article Restricted access
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dc.contributor.authorOliveira, Cesar
dc.contributor.authorMartins, Natercia
dc.contributor.authorMirante, Fátima
dc.contributor.authorCaseiro, Alexandre
dc.contributor.authorPio, Casimiro
dc.contributor.authorMatos, Manuel
dc.contributor.authorSilva, Hugo
dc.contributor.authorOliveira, Cristina
dc.contributor.authorCamões, Filomena
dc.date.accessioned2017-07-14T09:29:19Z
dc.date.available2017-07-14T09:29:19Z
dc.date.issued2016-02
dc.description.abstractParticulate 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 exhaustpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationALVES, 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.139-148pt_PT
dc.identifier.doi10.1016/j.atmosres.2015.09.007pt_PT
dc.identifier.issn0169-8095
dc.identifier.urihttp://hdl.handle.net/10400.21/7272
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://ac.els-cdn.com/S0169809515002859/1-s2.0-S0169809515002859-main.pdf?_tid=ce7880e2-5cab-11e7-8acd-00000aab0f01&acdnat=1498728043_1ff1271584fc3544ea8febc08c9ec61ept_PT
dc.subjectSize-segregated particlespt_PT
dc.subjectHopanespt_PT
dc.subjectAlkanespt_PT
dc.subjectRoad tunnelpt_PT
dc.subjectRoadsidept_PT
dc.subjectUrban backgroundpt_PT
dc.titleRoad tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matterpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage148pt_PT
oaire.citation.startPage139pt_PT
oaire.citation.titleAtmospheric Researchpt_PT
oaire.citation.volume168pt_PT
person.familyNameMirante
person.familyNameCaseiro
person.familyNamePio
person.familyNameMatos
person.familyNameSilva
person.givenNameFátima
person.givenNameAlexandre
person.givenNameCasimiro
person.givenNameManuel
person.givenNameHugo
person.identifier.ciencia-id521E-94A2-558B
person.identifier.ciencia-id6510-B1FA-2AED
person.identifier.ciencia-id2E14-6146-CC46
person.identifier.orcid0000-0002-1952-8214
person.identifier.orcid0000-0003-3188-3371
person.identifier.orcid0000-0002-3531-8620
person.identifier.orcid0000-0002-5240-8070
person.identifier.orcid0000-0003-1585-9099
person.identifier.scopus-author-id6507807047
person.identifier.scopus-author-id7005222105
person.identifier.scopus-author-id35588347400
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication91d5d3a1-5445-4dff-9378-125ed750d418
relation.isAuthorOfPublication8ce9662b-4f16-4398-b78a-fa534a06148c
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relation.isAuthorOfPublication8eb55ac9-195d-4a2e-aa62-eb6e004d5cd1
relation.isAuthorOfPublication.latestForDiscovery4cde1d82-9a0e-4e66-aaf3-72a1dc57ed1c

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