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A platform for research: civil engineering, architecture and urbanism
Characterization of water-soluble organic matter in urban aerosol by 1H-NMR spectroscopy
https://orcid.org/0000-0003-3825-0307
Abstract The functional and 13C isotopic compositions of water-soluble organic carbon (WSOC) in atmospheric aerosol were determined by nuclear magnetic resonance (1H-NMR) and isotope ratio mass spectrometry (IRMS) in an urban location in the Southern Mississippi Valley. The origin of WSOC was resolved using the functional distribution of organic hydrogen, δ13C ratio, and positive matrix factorization (PMF). Three factors were retained based on NMR spectral bins loadings. Two factors (factors 1 and 3) demonstrated strong associations with the aliphatic region in the NMR spectra and levoglucosan resonances. Differences between the two factors included the abundance of the aromatic functional group for factor 1, indicating fresh emissions and, for factor 3, the presence of resonances attributed to secondary ammonium nitrate and low δ13C ratio values that are indicative of secondary organic aerosol. Factors 1 and 3 added 0.89 and 1.08 μgC m−3, respectively, with the highest contribution in the summer and fall. Factor 2 retained resonances consistent with saccharides and was attributed to pollen particles. Its contribution to WSOC varied from 0.22 μgC m−3 in winter to 1.04 μgC m−3 in spring.
Graphical abstract Display Omitted
Highlights We characterized the water-soluble organic matter (WSOM) of ambient aerosol by NMR. Biomass burning and secondary aerosol dominated WSOM in the summer. Pollen particles accounted for most of WSOM in spring.
Characterization of water-soluble organic matter in urban aerosol by 1H-NMR spectroscopy
https://orcid.org/0000-0003-3825-0307
Abstract The functional and 13C isotopic compositions of water-soluble organic carbon (WSOC) in atmospheric aerosol were determined by nuclear magnetic resonance (1H-NMR) and isotope ratio mass spectrometry (IRMS) in an urban location in the Southern Mississippi Valley. The origin of WSOC was resolved using the functional distribution of organic hydrogen, δ13C ratio, and positive matrix factorization (PMF). Three factors were retained based on NMR spectral bins loadings. Two factors (factors 1 and 3) demonstrated strong associations with the aliphatic region in the NMR spectra and levoglucosan resonances. Differences between the two factors included the abundance of the aromatic functional group for factor 1, indicating fresh emissions and, for factor 3, the presence of resonances attributed to secondary ammonium nitrate and low δ13C ratio values that are indicative of secondary organic aerosol. Factors 1 and 3 added 0.89 and 1.08 μgC m−3, respectively, with the highest contribution in the summer and fall. Factor 2 retained resonances consistent with saccharides and was attributed to pollen particles. Its contribution to WSOC varied from 0.22 μgC m−3 in winter to 1.04 μgC m−3 in spring.
Graphical abstract Display Omitted
Highlights We characterized the water-soluble organic matter (WSOM) of ambient aerosol by NMR. Biomass burning and secondary aerosol dominated WSOM in the summer. Pollen particles accounted for most of WSOM in spring.
Characterization of water-soluble organic matter in urban aerosol by 1H-NMR spectroscopy
https://orcid.org/0000-0003-3825-0307
Abstract The functional and 13C isotopic compositions of water-soluble organic carbon (WSOC) in atmospheric aerosol were determined by nuclear magnetic resonance (1H-NMR) and isotope ratio mass spectrometry (IRMS) in an urban location in the Southern Mississippi Valley. The origin of WSOC was resolved using the functional distribution of organic hydrogen, δ13C ratio, and positive matrix factorization (PMF). Three factors were retained based on NMR spectral bins loadings. Two factors (factors 1 and 3) demonstrated strong associations with the aliphatic region in the NMR spectra and levoglucosan resonances. Differences between the two factors included the abundance of the aromatic functional group for factor 1, indicating fresh emissions and, for factor 3, the presence of resonances attributed to secondary ammonium nitrate and low δ13C ratio values that are indicative of secondary organic aerosol. Factors 1 and 3 added 0.89 and 1.08 μgC m−3, respectively, with the highest contribution in the summer and fall. Factor 2 retained resonances consistent with saccharides and was attributed to pollen particles. Its contribution to WSOC varied from 0.22 μgC m−3 in winter to 1.04 μgC m−3 in spring.
Graphical abstract Display Omitted
Highlights We characterized the water-soluble organic matter (WSOM) of ambient aerosol by NMR. Biomass burning and secondary aerosol dominated WSOM in the summer. Pollen particles accounted for most of WSOM in spring.
Characterization of water-soluble organic matter in urban aerosol by 1H-NMR spectroscopy
Chalbot, Marie-Cecile G. (author) / Chitranshi, Priyanka (author) / Gamboa da Costa, Gonçalo (author) / Pollock, Erik (author) / Kavouras, Ilias G. (author)
Atmospheric Environment ; 128 ; 235-245
2015-12-31
11 pages
Article (Journal)
Electronic Resource
English
Origin of the water-soluble organic nitrogen in the maritime aerosol
| Elsevier | 2017