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| Titel |
A novel method for online analysis of gas and particle composition: description and evaluation of a Filter Inlet for Gases and AEROsols (FIGAERO) |
| VerfasserIn |
F. D. Lopez-Hilfiker, C. Mohr, M. Ehn, F. Rubach, E. Kleist, J. Wildt, Th. F. Mentel, A. Lutz, M. Hallquist, D. Worsnop, J. A. Thornton |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2014-04-15), S.983-1001 |
| Datensatznummer |
250115695
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| Publikation (Nr.) |
 copernicus.org/amt-7-983-2014.pdf |
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| Zusammenfassung |
| We describe a novel inlet that allows measurement of both gas and particle
molecular composition when coupled to mass spectrometric, chromatographic, or
optical sensors: the Filter Inlet for Gases and AEROsols (FIGAERO). The
design goals for the FIGAERO are to allow unperturbed observation of ambient
air while simultaneously analyzing gases and collecting particulate matter on
a Teflon® (hereafter Teflon) filter via an entirely separate sampling port. The filter is
analyzed periodically by the same sensor on hourly or faster timescales using
temperature-programmed thermal desorption. We assess the performance of the
FIGAERO by coupling it to a high-resolution time-of-flight
chemical-ionization mass spectrometer (HRToF-CIMS) in laboratory chamber
studies of α-pinene oxidation and field measurements at a boreal
forest location. Low instrument backgrounds give detection limits of ppt or
lower for compounds in the gas-phase and in the picogram m−3 range for
particle phase compounds. The FIGAERO-HRToF-CIMS provides molecular
information about both gases and particle composition on the 1 Hz and hourly
timescales, respectively for hundreds of compounds. The FIGAERO thermal
desorptions are highly reproducible (better than 10%), allowing a
calibrated assessment of the effective volatility of desorbing compounds and
the role of thermal decomposition during the desorption process. We show that
the often multi-modal desorption thermograms arising from secondary organic
aerosol (SOA) provide additional insights into molecular composition and/or
particle morphology, and exhibit changes with changes in SOA formation or
aging pathways. |
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