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| Titel |
Technical Note: Intercomparison of formaldehyde measurements at the atmosphere simulation chamber SAPHIR |
| VerfasserIn |
A. Wisthaler, E. C. Apel, J. Bossmeyer, A. Hansel, W. Junkermann, R. Koppmann, R. Meier, K. Müller, S. J. Solomon, R. Steinbrecher, R. Tillmann, T. Brauers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 8 ; Nr. 8, no. 8 (2008-04-17), S.2189-2200 |
| Datensatznummer |
250006059
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| Publikation (Nr.) |
 copernicus.org/acp-8-2189-2008.pdf |
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| Zusammenfassung |
The atmosphere simulation chamber SAPHIR at the Research Centre
Jülich was used to test the suitability of state-of-the-art
analytical instruments for the measurement of gas-phase formaldehyde
(HCHO) in air. Five analyzers based on four different sensing
principles were deployed: a differential optical absorption
spectrometer (DOAS), cartridges for 2,4-dinitro\-phenyl\-hydrazine
(DNPH) derivatization followed by off-line high pressure liquid
chromatography (HPLC) analysis, two different types of commercially
available wet chemical sensors based on Hantzsch fluorimetry, and a
proton-transfer-reaction mass spectrometer (PTR-MS). A new optimized
mode of operation was used for the PTR-MS instrument which
significantly enhanced its performance for online HCHO detection at
low absolute humidities.
The instruments were challenged with typical ambient levels of HCHO
ranging from zero to several ppb. Synthetic air of high purity and
particulate-filtered ambient air were used as sample matrices in the
atmosphere simulation chamber onto which HCHO was spiked under varying
levels of humidity and ozone. Measurements were compared to mixing
ratios calculated from the chamber volume and the known amount of HCHO
injected into the chamber; measurements were also compared between the
different instruments. The formal and blind intercomparison exercise
was conducted under the control of an independent referee. A number of
analytical problems associated with the experimental set-up and with
individual instruments were identified, the overall agreement between
the methods was fair. |
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