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Importance of atmospheric aging in reactivity of mineral dust aerosol: a case study of heterogeneous reaction of gaseous hydrogen peroxide on processed mineral particles

Zhao, Y.; Chen, Z. M.; Shen, X. L.; Huang, D.

Atmospheric aging and processing appears to alter physical and chemical properties of mineral dust aerosol and thus its role as reactive surface in the troposphere. Yet, previous studies in the atmosphere have mainly focused on the clean surfaces of mineral dust aerosol, and the reactivity of aged mineral aerosol toward atmospheric trace gases is still poorly recognized. This work presents the first laboratory investigation of heterogeneous reactions of gaseous hydrogen peroxide (H₂O₂), an important atmospheric oxidant, on the surface of HNO₃ and SO₂-processed alumina particles as surrogates of mineral dust aerosol aged by acidic trace gases as a function of relative humidity (RH) and surface coverage of coatings. Pretreatment of the alumina surfaces with HNO₃ and SO₂ has a strong impact on its reactivity toward H₂O₂ uptake. On HNO₃-processed particles, because of the dual role of the nitrate coating in modifying the reactivity of the particle surface, namely blocking oxide active sites but altering surface hygroscopicity, H₂O₂ uptake seems to decrease in some cases whereas increase in other cases, largely depending on RH and surfac ... mehr

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Postprint §
DOI: 10.5445/IR/1000088059
Veröffentlicht am 29.11.2018
DOI: 10.5194/acpd-11-28563-2011
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2011
Sprache Englisch
Identifikator ISSN: 1680-7375
KITopen-ID: 1000088059
Erschienen in Atmospheric chemistry and physics / Discussions
Band 11
Heft 10
Seiten 28563–28586
Vorab online veröffentlicht am 24.10.2011
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