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Chemical investigation of eight different types of carbonaceous particles using thermoanalytical techniques.

Environ. Sci. Technol. 41, 8406-8411 (2007)
Verlagsversion DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
The chemical composition of ambient aerosol particles affects numerous important aerosol parameters such as their hygroscopicity, optics, and mass as well as their potentially adverse health effects. The objective of this study was to derive both detailed chemical speciation and useful proxies for the quantitative classification of the organic matter (OM) content of carbonaceous aerosol samples. Using three different thermal desorption techniques in an inert atmosphere we investigated eight different carbonaceous particulate matter (PM) samples used for health effect studies: thermal desorption gas chromatography with mass spectrometry, evolved gas analysis with mass spectrometry, and thermogravimetry with Fourier transform infrared spectroscopy. The samples include different types of laboratory-generated particles (pigment black, diffusion flame soot, spark-generated carbon) and two ambient aerosol samples (diesel soot and particulates collected in a road tunnel). All samples showed increasing mass desorption with rising temperature, but no reliable OM classification was possible based on thermal mass desorption alone. In fact, the “organic-free” spark-generated carbon particles showed the second highest mass desorption at 800 °C due to the formation of oxygenated structures on unsaturated surface sites and the subsequent evolution of CO and CO2 at elevated temperatures. A quantitative OM classification was accomplished by combining measurements of thermogravimetry and mass spectrometry (up to 800 °C) into a novel parameter, the “apparent organic mass fraction”. The validity of this classification was confirmed with a second proxy parameter, based only on the evolution of organic components during thermal desorption and information on the generation process of the particles. Both types of pigment blacks (Printex) samples and the spark-generated carbon particles showed the lowest apparent organic mass fraction (<5%), whereas for road tunnel and diesel emission particles <16 and <19% was estimated, respectively.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter partikulate matter; elemental carbon content; organic carbon content; EGA-MS; TG-FTIR; TD-GC-MS; diesel emissions; tunnel dust; diesel exhaust particles; surrogate soot particles: palas soot; spark discharge particles; carbon particles; diffusion flame so
ISSN (print) / ISBN 0013-936X
e-ISSN 1520-5851
Quellenangaben Band: 41, Heft: 24, Seiten: 8406-8411 Artikelnummer: , Supplement: ,
Verlag ACS
Verlagsort Washington, DC
Begutachtungsstatus Peer reviewed