Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20443
Title: | H-1 NMR studies of water- and alkaline-soluble organic matter from fine urban atmospheric aerosols |
Author: | Lopes, Sonia P. Matos, Joao T. V. Silva, Artur M. S. Duarte, Armando C. Duarte, Regina M. B. O. |
Keywords: | MAGNETIC-RESONANCE-SPECTROSCOPY MASS-SPECTROMETRY UNITED-STATES PO VALLEY CARBON NMR SUBSTANCES COMPONENTS CAMPAIGN FEATURES |
Issue Date: | 2015 |
Publisher: | PERGAMON-ELSEVIER SCIENCE LTD |
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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20443 |
DOI: | 10.1016/j.atmosenv.2015.08.072 |
ISSN: | 1352-2310 |
Publisher Version: | 10.1016/j.atmosenv.2015.08.072 |
Appears in Collections: | CICECO - Artigos |
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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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