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| Titel |
Heterogeneous conversion of NO2 on secondary organic aerosol surfaces: A possible source of nitrous acid (HONO) in the atmosphere? |
| VerfasserIn |
R. Bröske, J. Kleffmann, P. Wiesen |
| 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 ; 3, no. 3 ; Nr. 3, no. 3 (2003-05-13), S.469-474 |
| Datensatznummer |
250001025
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| Publikation (Nr.) |
 copernicus.org/acp-3-469-2003.pdf |
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| Zusammenfassung |
| The heterogeneous conversion of
NO2 on different secondary organic aerosols (SOA) was investigated with the focus on a possible formation of nitrous acid (HONO). In one set of
experiments different organic aerosols were produced in the reactions of O3 with
alpha-pinene, limonene or catechol and OH radicals with toluene or limonene, respectively. The aerosols
were sampled on filters and exposed to humidified NO2
mixtures under atmospheric conditions. The estimated upper limits for the uptake coefficients of
NO2
and the reactive uptake coefficients NO2
-> HONO are in the range of 10-6 and 10-7, respectively. The
integrated HONO formation for 1 h reaction time was <1013 cm-2 geometrical surface and
<1017 g-1 particle mass. In a second set of experiments the conversion of
NO2
into HONO in the presence of organic particles was carried out in an aerosol flow tube under atmospheric
conditions. In this case the aerosols were produced in the reaction of O3
with beta-pinene, limonene or catechol, respectively. The upper limits for the reactive uptake coefficients
NO2
-> HONO were in the range of 7 x 10-7 - 9 x 10-6. The results from the present study show
that heterogeneous formation of nitrous acid on secondary organic aerosols (SOA) is
unimportant for the atmosphere. |
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