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| Titel |
Uptake of HO2 radicals onto Arizona test dust particles using an aerosol flow tube |
| VerfasserIn |
P. S. J. Matthews, M. T. Baeza-Romero, L. K. Whalley, D. E. Heard |
| 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 ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-18), S.7397-7408 |
| Datensatznummer |
250118897
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| Publikation (Nr.) |
 copernicus.org/acp-14-7397-2014.pdf |
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| Zusammenfassung |
| Uptake coefficients for HO2 radicals onto Arizona test dust (ATD)
aerosols were measured at room temperature and atmospheric pressure using an
aerosol flow tube and the sensitive fluorescence assay by gas expansion
(FAGE) technique, enabling HO2 concentrations in the range
3–10 × 108 molecule cm−3 to be investigated. The uptake
coefficients were measured as 0.031 ± 0.008 and 0.018 ± 0.006
for the lower and higher HO2 concentrations, respectively, over a range
of relative humidities (5–76%). A time dependence for the HO2
uptake onto the ATD aerosols was observed, with larger uptake coefficients
observed at shorter reaction times. The combination of time and HO2
concentration dependencies suggest either the partial saturation of the dust
surface or that a chemical component of the dust is partially consumed whilst
the aerosols are exposed to HO2. A constrained box model is used to show
that HO2 uptake to dust surfaces may be an important loss pathway of
HO2 in the atmosphere. |
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