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| Titel |
Quantification of gas-phase glyoxal and methylglyoxal via the Laser-Induced Phosphorescence of (methyl)GLyOxal Spectrometry (LIPGLOS) Method |
| VerfasserIn |
S. B. Henry, A. Kammrath, F. N. Keutsch |
| 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 ; 5, no. 1 ; Nr. 5, no. 1 (2012-01-23), S.181-192 |
| Datensatznummer |
250002315
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| Publikation (Nr.) |
 copernicus.org/amt-5-181-2012.pdf |
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| Zusammenfassung |
| Glyoxal and methylglyoxal are key products of oxidative photochemistry in the
lower troposphere. Reliable measurements of such compounds are critical for
testing our understanding of volatile organic compound (VOC) processing in
this region. We present a new method for obtaining sensitive, high time
resolution, in situ measurements of these compounds via laser-induced
phosphorescent decays. By exploiting the unique phosphorescent lifetimes for
each molecule, this method achieves speciation and high-sensitivity
quantification of both molecules. With two different light sources at
different wavelengths, the lowest 3σ limits of detection observed
during calibration with this method are 11 pptv in 5 min for
glyoxal and 243 pptv in 5 min for methylglyoxal. During ambient
measurements of glyoxal, a 3σ limit of detection of
<4.4 pptv in 5 min was observed. Additionally, this method
enables the simultaneous measurement of both glyoxal and methylglyoxal using
a single, non-wavelength-tunable light source, which will allow for the
development of inexpensive (~$40 k) and turnkey instrumentation. The
simplicity and affordability of this new instrumentation would enable the
construction of a long-term, spatially distributed database of these two key
species. This chemical map can be used to constrain or drive regional or
global models as well as provide verification of satellite observations. |
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