Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/19612
Title: | Two chemically distinct light-absorbing pools of urban organic aerosols: A comprehensive multidimensional analysis of trends |
Author: | Paula, Andreia S. Matos, Joao T. V. Duarte, Regina M. B. O. Duarte, Armando C. |
Keywords: | 2-DIMENSIONAL LIQUID-CHROMATOGRAPHY ATMOSPHERIC AEROSOLS BROWN CARBON FINE AEROSOL OPTICAL-PROPERTIES BLACK CARBON MATTER STATE ABSORPTION COMPONENTS |
Issue Date: | 2016 |
Publisher: | PERGAMON-ELSEVIER SCIENCE LTD |
Abstract: | The chemical and light-absorption dynamics of organic aerosols (OAs), a master variable in the atmosphere, have yet to be resolved. This study uses a comprehensive multidimensional analysis approach for exploiting simultaneously the compositional changes over a molecular size continuum and associated light-absorption (ultraviolet absorbance and fluorescence) properties of two chemically distinct pools of urban OAs chromophores. Up to 45% of aerosol organic carbon (OC) is soluble in water and consists of a complex mixture of fluorescent and UV-absorbing constituents, with diverse relative abundances, hydrophobic, and molecular weight (Mw) characteristics between warm and cold periods. In contrast, the refractory alkaline-soluble OC pool (up to 18%) is represented along a similar Mw and light-absorption continuum throughout the different seasons. Results suggest that these alkaline-soluble chromophores may actually originate from primary OAs sources in the urban site. This work shows that the comprehensive multidimensional analysis method is a powerful and complementary tool for the characterization of OAs fractions. The great diversity in the chemical composition and optical properties of OAs chromophores, including both water-soluble and alkaline-soluble OC, may be an important contribution to explain the contrasting photo-reactivity and atmospheric behavior of OAs. (C) 2015 Elsevier Ltd. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19612 |
DOI: | 10.1016/j.chemosphere.2015.11.093 |
ISSN: | 0045-6535 |
Publisher Version: | 10.1016/j.chemosphere.2015.11.093 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Two chemically distinct light-absorbing pools of urban organic aerosols A comprehensive multidimensional analysis of trends_10.1016j.chemosphere.2015.11.093.pdf | 1.69 MB | Adobe PDF |
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