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| Titel |
Interferences of commercially available NO2 instruments under different conditions |
| VerfasserIn |
G. Villena Tapia, I. Bejan, T. Sackmann, P. Wiesen, R. Kurtenbach, J. Kleffmann |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250029787
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| Zusammenfassung |
| For the correct understanding of atmospheric chemical processes and validation of models
predictions, reliable measurements of different atmospheric trace species are necessary.
NOx(NO + NO2) play a crucial role in tropospheric photochemistry, regulating production
rates of O3. The detection of NO by chemiluminescence technique is widely accepted.
However NO2 detection it is a more difficult task since many of the different commercial
techniques used are affected by interferences. Chemiluminescence instruments for NO2, that
are used for the indirect detection in monitoring networks and smog chambers, use either
molybdenum or photolytic converters and are affected by either positive (NOy) or
negative (radical formation in the photolytic converter) interferences. Erroneous
conclusions can be reached if these interferences are not taken into consideration. In
the present study, interferences of commercial NO2 instruments (molybdenum,
xenon lamp and blue-light type converters) are presented and discussed under very
different conditions, i.e. for tunnel, smog chamber and kerbside measurements. |
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