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http://hdl.handle.net/10773/20443
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DC Field | Value | Language |
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dc.contributor.author | Lopes, Sonia P. | pt |
dc.contributor.author | Matos, Joao T. V. | pt |
dc.contributor.author | Silva, Artur M. S. | pt |
dc.contributor.author | Duarte, Armando C. | pt |
dc.contributor.author | Duarte, Regina M. B. O. | pt |
dc.date.accessioned | 2017-12-07T19:47:16Z | - |
dc.date.issued | 2015 | pt |
dc.identifier.issn | 1352-2310 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20443 | - |
dc.description.abstract | Solution-state H-1 NMR spectroscopy was applied to characterize the structural features of water- and alkaline-soluble organic matter (WSOM and ASOM, respectively) sequentially extracted from fine urban atmospheric aerosols collected over different seasons. The objectives of this study were twofold: (i) to compare the functional characteristics of fine aerosol WSOM and the yet unknown ASOM, and (ii) to assess the sources of WSOM and ASOM at an urban location. The H-1 NMR analysis confirmed that the WSOM and ASOM fractions hold similar 1H functional groups; however, they differ in terms of their relative distribution throughout the seasons. The winter and autumn samples have a less aliphatic and oxidized character and higher contributions from aromatic groups than those of warmer conditions. The urban aerosol WSOM and ASOM fractions do not fit the established H-1 NMR source apportionment fingerprints of marine, secondary, and biomass burning organic aerosols (OAs), exhibiting a smaller relative contribution of carbon-oxygen double bonds, which is indicative of a less oxidized character. These results confirm that the boundaries of the pre-established source categories, especially for secondary and biomass burning OAs, might be different at urban locations, suggesting the need to improve the H-1 NMR source apportionment model for including a new fingerprint for urban OAs. (C) 2015 Elsevier Ltd. All rights reserved. | pt |
dc.language.iso | eng | pt |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147273/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147415/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147332/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | MAGNETIC-RESONANCE-SPECTROSCOPY | pt |
dc.subject | MASS-SPECTROMETRY | pt |
dc.subject | UNITED-STATES | pt |
dc.subject | PO VALLEY | pt |
dc.subject | CARBON | pt |
dc.subject | NMR | pt |
dc.subject | SUBSTANCES | pt |
dc.subject | COMPONENTS | pt |
dc.subject | CAMPAIGN | pt |
dc.subject | FEATURES | pt |
dc.title | H-1 NMR studies of water- and alkaline-soluble organic matter from fine urban atmospheric aerosols | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 374 | pt |
degois.publication.lastPage | 380 | pt |
degois.publication.title | ATMOSPHERIC ENVIRONMENT | pt |
degois.publication.volume | 119 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.atmosenv.2015.08.072 | pt |
dc.identifier.doi | 10.1016/j.atmosenv.2015.08.072 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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H-1 NMR studies of water- and alkaline-soluble organic matter from fine urban atmospheric aerosols_10.1016j.atmosenv.2015.08.072.pdf | 737.83 kB | Adobe PDF |
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