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| Titel |
A novel inlet system for online chemical analysis of semi-volatile submicron particulate matter |
| VerfasserIn |
P. Eichler, M. Müller, B. D'Anna, A. Wisthaler |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2015-03-20), S.1353-1360 |
| Datensatznummer |
250116221
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| Publikation (Nr.) |
 copernicus.org/amt-8-1353-2015.pdf |
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| Zusammenfassung |
We herein present a novel modular inlet system designed to be coupled to
low-pressure gas analyzers for online chemical characterization of
semi-volatile submicron particles. The "chemical analysis of aerosol
online" (CHARON) inlet consists of a gas-phase denuder for stripping off
gas-phase analytes, an aerodynamic lens for particle collimation combined
with an inertial sampler for the particle-enriched flow and a
thermodesorption unit for particle volatilization prior to chemical
analysis. The denuder was measured to remove gas-phase organics with an
efficiency > 99.999% and to transmit particles in the
100–750 nm size range with a 75–90% efficiency. The measured
average particle enrichment factor in the subsampling flow from the
aerodynamic lens was 25.6, which is a factor of 3 lower than the calculated
theoretical optimum.
We coupled the CHARON inlet to a proton-transfer-reaction time-of-flight mass
spectrometer (PTR-ToF-MS) which quantitatively detects most organic analytes
and ammonia. The combined CHARON-PTR-ToF-MS setup is thus capable of
measuring both the organic and the ammonium fraction in submicron particles
in real time. Individual organic compounds can be detected down to levels of
10–20 ng m−3. Two proof-of-principle studies were carried out for
demonstrating the analytical power of this new instrumental setup:
(i) oxygenated organics and their partitioning between the gas and the
particulate phase were observed from the reaction of limonene with ozone and
(ii) nicotine was measured in cigarette smoke particles demonstrating that
selected organic target compounds can be detected in submicron particles in
real time. |
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