Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/17140
Title: | Natural organic matter in urban aerosols: comparison between water and alkaline soluble components using excitation-emission matrix fluorescence spectroscopy and multiway data analysis |
Author: | Matos, João T. V. Freire, Sandra M. S. C. Duarte, Regina M. B. O. Duarte, Armando C. |
Keywords: | Water-soluble organic matter Alkaline-soluble organic matter Atmospheric aerosols Fluorescence spectroscopy Emissioneexcitation matrix PARAFAC-ALS |
Issue Date: | 2015 |
Publisher: | Elsevier |
Abstract: | Understanding the complexity of Natural Organic Matter (NOM) in atmospheric aerosols has remained an important goal for the atmospheric research community. This work employs a Parallel Factor Model (PARAFAC) with Alternating Least Squares (ALS) algorithm to decompose and further compare sets of excitation-emission matrices fluorescence spectra of Water-soluble and Alkaline-soluble Organic Matter (WSOM and ASOM, respectively), sequentially extracted from urban aerosols collected during different seasons. The PARAFAC-ALS modelling identified three components in both WSOM and ASOM, whose maximum intensities follow a clear seasonal trend and which are likely to represent the dominant fluorescent moieties in NOM from urban aerosols. The PARAFAC-ALS modelling also indicated differences between the colder and warmer seasons in the fluorescence map of one WSOM component, which contrast with the results obtained for the ASOM, where the fluorescence signatures were found to be constant along the seasons, suggesting that the ASOM may have an in situ origin. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/17140 |
DOI: | 10.1016/j.atmosenv.2014.11.042 |
ISSN: | 1352-2310 |
Appears in Collections: | CESAM - Artigos DQ - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Matos et al. - 2015 - Natural organic matter in urban aerosols Comparis.pdf | 1.96 MB | Adobe PDF |
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