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| Titel |
Formaldehyde measurements by Proton transfer reaction – Mass Spectrometry (PTR-MS): correction for humidity effects |
| VerfasserIn |
A. Vlasenko, A. M. Macdonald, S. J. Sjostedt, J. P. D. Abbatt |
| 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. 4 ; Nr. 3, no. 4 (2010-08-17), S.1055-1062 |
| Datensatznummer |
250001219
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| Publikation (Nr.) |
 copernicus.org/amt-3-1055-2010.pdf |
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| Zusammenfassung |
| Formaldehyde measurements can provide useful information about photochemical
activity in ambient air, given that HCHO is formed via numerous oxidation
processes. Proton transfer reaction mass spectrometry (PTR-MS) is an online
technique that allows measurement of VOCs at the sub-ppbv level with good
time resolution. PTR-MS quantification of HCHO is hampered by the humidity
dependence of the instrument sensitivity, with higher humidity leading to
loss of PTR-MS signal. In this study we present an analytical, first
principles approach to correct the PTR-MS HCHO signal according to the
concentration of water vapor in sampled air. The results of the correction
are validated by comparison of the PTR-MS results to those from a Hantzsch
fluorescence monitor which does not have the same humidity dependence.
Results are presented for an intercomparison made during a field campaign in
rural Ontario at Environment Canada's Centre for Atmospheric Research
Experiments. |
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