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| Titel |
A new aerosol collector for quasi on-line analysis of particulate organic matter: the Aerosol Collection Module (ACM) and first applications with a GC/MS-FID |
| VerfasserIn |
T. Hohaus, D. Trimborn, A. Kiendler-Scharr, I. Gensch, W. Laumer, B. Kammer, S. Andres, H. Boudries, K. A. Smith, D. R. Worsnop, J. T. Jayne |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 5 ; Nr. 3, no. 5 (2010-10-12), S.1423-1436 |
| Datensatznummer |
250001301
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| Publikation (Nr.) |
 copernicus.org/amt-3-1423-2010.pdf |
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| Zusammenfassung |
In many environments organic matter significantly contributes to the
composition of atmospheric aerosol particles influencing its properties.
Detailed chemical characterization of ambient aerosols is critical in order
to understand the formation process, composition, and properties of aerosols
and facilitates source identification and relative contributions from different
types of sources to ambient aerosols in the atmosphere. However, current analytical
methods are far from full speciation of organic aerosols and often require sampling
times of up to one week. Offline
methods are also subjected to artifacts during aerosol collection and
storage.
In the present work a new technique for quasi on-line compound specific
measurements of organic aerosol particles was developed. The Aerosol
Collection Module (ACM) focuses particles into a beam which
is directed to a cooled sampling surface. The sampling takes place in a high
vacuum environment where the gas phase from the sample volume is removed.
After collection is completed volatile and semi-volatile compounds are evaporated from the collection
surface through heating and transferred to a detector.
For laboratory characterization the ACM was interfaced with a Gas
Chromatograph Mass Spectrometer, Flame Ionization Detector system (GC/MS-FID), abbreviated as ACM GC-MS. The particle collection
efficiency, gas phase transfer efficiency, and linearity of the ACM GC-MS
were determined using laboratory generated octadecane aerosols. The ACM GC-MS
is linear over the investigated mass range of 10 to 100 ng and a recovery
rate of 100% was found for octadecane particles.
The ACM GC-MS was applied to investigate secondary organic aerosol (SOA)
formed from β-pinene oxidation. Nopinone, myrtanal, myrtenol,
1-hydroxynopinone, 3-oxonopinone, 3,7-dihydroxynopinone, and
bicyclo[3,1,1]hept-3-ene-2-one were found as products in the SOA. The ACM GC-MS
results are compared to quartz filter samples taken in parallel to the ACM GC-MS
measurements. First measurements of ambient atmospheric aerosols are
presented. |
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