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dc.contributorDepartment of Civil and Environmental Engineering-
dc.creatorDiab, J-
dc.creatorStreibel, T-
dc.creatorCavalli, F-
dc.creatorLee, SC-
dc.creatorSaathoff, H-
dc.creatorMamakos, A-
dc.creatorChow, JC-
dc.creatorChen, LWA-
dc.creatorWatson, JG-
dc.creatorSippula, O-
dc.creatorZimmermann, R-
dc.publisherCopernicus Gesellschaften_US
dc.rights© Author(s) 2015. This is an open access article distributed under the Creative Commons Attribution 3.0 License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en_US
dc.rightsThe following publication: Diab, J., Streibel, T., Cavalli, F., Lee, S. C., Saathoff, H., Mamakos, A., Chow, J. C., Chen, L.-W. A., Watson, J. G., Sippula, O., and Zimmermann, R.: Hyphenation of a EC / OC thermal–optical carbon analyzer to photo-ionization time-of-flight mass spectrometry: an off-line aerosol mass spectrometric approach for characterization of primary and secondary particulate matter, Atmos. Meas. Tech., 8, 3337-3353 is available at, 2015.en_US
dc.titleHyphenation of a EC / OC thermal-optical carbon analyzer to photo-ionization time-of-flight mass spectrometry : an off-line aerosol mass spectrometric approach for characterization of primary and secondary particulate matteren_US
dc.typeJournal/Magazine Articleen_US
dcterms.abstractSource apportionment and characterization of primary and secondary aerosols remains a challenging research field. In particular, the organic composition of primary particles and the formation mechanism of secondary organic aerosols (SOAs) warrant further investigations. Progress in this field is strongly connected to the development of novel analytical techniques. In this study an off-line aerosol mass spectrometric technique based on filter samples, a hyphenated thermal-optical analyzer photo-ionization time-of-flight mass spectrometer (PI-TOFMS) system, was developed. The approach extends the capability of the widely used particulate matter (PM) carbon analysis (for elemental / organic carbon, EC / OC) by enabling the investigation of evolved gaseous species with soft and selective (resonance enhanced multi-photon ionization, REMPI) and non-selective photo-ionization (single-photon ionization, SPI) techniques. SPI was tuned to be medium soft to achieve comparability with results obtained by the electron ionization aerosol mass spectrometer (AMS). Different PM samples including wood combustion emission samples, smog chamber samples from the reaction of ozone with different SOA precursors, and ambient samples taken at Ispra, Italy, in winter as well as in summer were tested. The EC / OC-PI-TOFMS technique increases the understanding of the processes during thermal-optical analysis and identifies marker substances for the source apportionment. Composition of oligomeric or polymeric species present in PM can be investigated by the analysis of the thermal breakdown products. In the case of wood combustion, in addition to the well-known markers at m/z ratios of 60 and 73, two new characteristic masses (m/z 70 and 98) have been revealed as potentially linked to biomass burning. All four masses were also the dominant signals in an ambient sample taken in winter time in Ispra, Italy, confirming the finding that wood burning for residential heating is a major source of PM in winter at this location. The summer sample from the same location showed no influence of wood burning, but seems to be dominated by SOAs, which was confirmed from the comparison with chamber experiment samples. The experiments conducted with terpenes as precursors showed characteristic masses at m/z 58 and 82, which were not observable in any other emission samples and could serve as a marker for SOA from terpenes.-
dcterms.bibliographicCitationAtmospheric measurement techniques, 2015, v. 8, no. 8, p. 3337-3353-
dcterms.isPartOfAtmospheric measurement techniques-
dc.description.ros2015-2016 > Academic research: refereed > Publication in refereed journalen_US
dc.description.validate201811_a bcmaen_US
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