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Identification of humic-like substances (HULIS) in oxygenated organic aerosols using NMR and AMS factor analyses and liquid chromatographic techniques
- Source :
- Atmospheric Chemistry and Physics, 14 (1), Atmospheric Chemistry and Physics, Vol 14, Iss 1, Pp 25-45 (2014), Atmospheric Chemistry and Physics Discussions, 13, 17197–17252, Atmospheric chemistry and physics 14(1), 25-45 (2014). doi:10.5194/acp-14-25-2014, Atmospheric Chemistry and Physics, 1, 14, 25-45, Atmospheric chemistry and physics, 14 (2014): 25–45. doi:10.5194/acp-14-25-2014, info:cnr-pdr/source/autori:M. Paglione1, A. Kiendler-Scharr2, A. A. Mensah2,*, E. Finessi1,**, L. Giulianelli1, S. Sandrini1, M. C. Facchini1, S. Fuzzi1, P. Schlag2, A. Piazzalunga3, E. Tagliavini4, J. S. Henzing5, and S. Decesari1/titolo:Identification of humic-like substances (HULIS) in oxygenated organic aerosols using NMR and AMS factor analyses and liquid chromatographic techniques/doi:10.5194%2Facp-14-25-2014/rivista:Atmospheric chemistry and physics (Print)/anno:2014/pagina_da:25/pagina_a:45/intervallo_pagine:25–45/volume:14
- Publication Year :
- 2014
- Publisher :
- Copernicus, 2014.
-
Abstract
- The atmospheric organic aerosol composition is characterized by a great diversity of functional groups and chemical species, challenging simple classification schemes. Traditional offline chemical methods identify chemical classes based on the retention behaviour on chromatographic columns and absorbing beds. Such an approach led to the isolation of complex mixtures of compounds such as the humic-like substances (HULIS). More recently, online aerosol mass spectrometry (AMS) was employed to identify chemical classes by extracting fragmentation patterns from experimental data series using statistical methods (factor analysis), providing simplified schemes for the classification of oxygenated organic aerosols (OOAs) on the basis of the distribution of oxygen-containing functionalities. The analysis of numerous AMS data sets suggested the occurrence of very oxidized OOAs which were postulated to correspond to HULIS. However, only a few efforts were made to test the correspondence of the AMS classes of OOAs with the traditional classifications from the offline methods. In this paper, we consider a case study representative of polluted continental regional background environments. We examine the AMS factors for OOAs identified by positive matrix factorization (PMF) and compare them to chemical classes of water-soluble organic carbon (WSOC) analysed offline on a set of filters collected in parallel. WSOC fractionation was performed by means of factor analysis applied to proton nuclear magnetic resonance (NMR) spectroscopic data, and by applying an ion-exchange chromatographic method for direct quantification of HULIS. Results show that the very oxidized low-volatility OOAs from AMS correlate with the NMR factor showing HULIS features and also with true "chromatographic" HULIS. On the other hand, UV/VIS-absorbing polyacids (or HULIS {sensu stricto}) isolated on ion-exchange beds were only a fraction of the AMS and NMR organic carbon fractions showing functional groups attributable to highly substituted carboxylic acids, suggesting that unspeciated low-molecular weight organic acids contribute to HULIS in the broad sense.
- Subjects :
- Atmospheric Science
010504 meteorology & atmospheric sciences
Earth & Environment
Classification scheme
Fractionation
Environment
010501 environmental sciences
01 natural sciences
lcsh:Chemistry
Urban Development
ddc:550
Built Environment
Sensu stricto
FINE ATMOSPHERIC AEROSOL
0105 earth and related environmental sciences
BIOMASS-BURNING AEROSOLS
Chromatography
Industrial Innovation
Chemistry
MULTIVARIATE CURVE RESOLUTION
CAS - Climate, Air and Sustainability
NMR
lcsh:QC1-999
SOURCE APPORTIONMENT
lcsh:QD1-999
13. Climate action
Environmental chemistry
Sustainable Chemical Industry
Aerosol mass spectrometry
Aerosol composition
ELSS - Earth, Life and Social Sciences
EELS - Earth, Environmental and Life Sciences
lcsh:Physics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Atmospheric Chemistry and Physics, 14 (1), Atmospheric Chemistry and Physics, Vol 14, Iss 1, Pp 25-45 (2014), Atmospheric Chemistry and Physics Discussions, 13, 17197–17252, Atmospheric chemistry and physics 14(1), 25-45 (2014). doi:10.5194/acp-14-25-2014, Atmospheric Chemistry and Physics, 1, 14, 25-45, Atmospheric chemistry and physics, 14 (2014): 25–45. doi:10.5194/acp-14-25-2014, info:cnr-pdr/source/autori:M. Paglione1, A. Kiendler-Scharr2, A. A. Mensah2,*, E. Finessi1,**, L. Giulianelli1, S. Sandrini1, M. C. Facchini1, S. Fuzzi1, P. Schlag2, A. Piazzalunga3, E. Tagliavini4, J. S. Henzing5, and S. Decesari1/titolo:Identification of humic-like substances (HULIS) in oxygenated organic aerosols using NMR and AMS factor analyses and liquid chromatographic techniques/doi:10.5194%2Facp-14-25-2014/rivista:Atmospheric chemistry and physics (Print)/anno:2014/pagina_da:25/pagina_a:45/intervallo_pagine:25–45/volume:14
- Accession number :
- edsair.doi.dedup.....138ed21ea9de132452f31b80c3eaf216