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| Titel |
A new technique for the selective measurement of atmospheric peroxy radical concentrations of HO2 and RO2 using a denuding method |
| VerfasserIn |
K. Miyazaki, A. E. Parker, C. Fittschen, P. S. Monks, Y. Kajii |
| 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. 6 ; Nr. 3, no. 6 (2010-11-10), S.1547-1554 |
| Datensatznummer |
250001358
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| Publikation (Nr.) |
 copernicus.org/amt-3-1547-2010.pdf |
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| Zusammenfassung |
| A technique for the selective measurement of atmospheric HO2 and
RO2 using peroxy radical chemical amplification coupled to
laser-induced fluorescence NO2 detection (PERCA-LIF) is
demonstrated. By pulling the air through a filled pre-inlet advantage can be
taken of the higher heterogeneous loss rate of HO2 relative to
CH3O2. Pre-inlet conditions have been found where ca. 90% of
HO2 was removed whereas the comparable CH3O2 loss was
15%. The dependence of loss rate on humidity and peroxy radical
concentration has been investigated. When using glass beads as the surface
for peroxy radical removal, the influence of the relative humidity on the
removal efficiency becomes negligible. It may therefore be possible to apply
this technique to the measurement of absolute concentrations of solely
RO2 as well as the sum of HO2 and RO2. The practical utility
of the PERCA-LIF coupled to a denuder has been demonstrated with atmospheric
measurements. |
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