期刊
ATMOSPHERIC ENVIRONMENT
卷 119, 期 -, 页码 374-380出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2015.08.072
关键词
Atmospheric aerosols; Water-soluble organic matter; Alkaline-soluble organic matter; H-1 NMR spectroscopy; Source apportionment
资金
- Centre for Environmental and Marine Studies [UID/AMB/50017/2013]
- Organic Chemistry Research Unit (QOPNA) [UID/QUI/00062/2013]
- Portuguese Science and Technology Foundation (FCT), through the European Social Fund (ESF)
- Portuguese Science and Technology Foundation (FCT), through the Programa Operacional Potencial Humano POPH
- Regina M.B.O. Duarte [SFRH/BPD/102882/2014]
- Joao T.V. Matos [SFRH/BD/84247/2012]
- FEDER under the Operational Program for Competitiveness Factors COMPETE
- National funds via FCT within the framework of research projects ORGANOSOL [PTDC/CTE-ATM/118551/2010]
- CN-linkAIR [PTDC/AAG-MAA/2584/2012]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/102882/2014, PTDC/AAG-MAA/2584/2012, PTDC/CTE-ATM/118551/2010] Funding Source: FCT
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.
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