Repozitorij Univerze v Novi Gorici

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Naslov:Investigating the use of secondary organic aerosol as seed particles in simulation chamber experiments
Avtorji:Hamilton, Jaqueline F (Avtor)
Alfarra, M Rami (Avtor)
Wyche, Kevin P (Avtor)
Ward, Martyn W (Avtor)
Lewis, Alistair C (Avtor)
McFiggans, Gordon B (Avtor)
Good, Nicholas (Avtor)
Monks, Paul S (Avtor)
Carr, Timo (Avtor)
White, Iain R (Avtor)
Purvis, Ruth M (Avtor)
Datoteke:Gradivo nima datotek. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:The use of β-caryophyllene secondary organic aerosol particles as seeds for smog chamber simulations has been investigated. A series of experiments were carried out in the Manchester photochemical chamber as part of the Aerosol Coupling in the Earth System (ACES) project to study the effect of seed particles on the formation of secondary organic aerosol (SOA) from limonene photo-oxidation. Rather than use a conventional seed aerosol containing ammonium sulfate or diesel particles, a method was developed to use in-situ chamber generated seed particles from β-caryophyllene photo-oxidation, which were then diluted to a desired mass loading (in this case 4-13 μg m-3). Limonene was then introduced into the chamber and oxidised, with the formation of SOA seen as a growth in the size of oxidised organic seed particles from 150 to 325 nm mean diameter. The effect of the partitioning of limonene oxidation products onto the seed aerosol was assessed using aerosol mass spectrometry during the experiment and the percentage of m/z 44, an indicator of degree of oxidation, increased from around 5 to 8 %. The hygroscopicity of the aerosol also changed, with the growth factor for 200 nm particles increasing from less than 1.05 to 1.25 at 90 % RH. The detailed chemical composition of the limonene SOA could be extracted from the complex β-caryophyllene matrix using two-dimensional gas chromatography (GC× GC) and liquid chromatography coupled to mass spectrometry. High resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS) was used to determine exact molecular formulae of the seed and the limonene modified aerosol. The average O:C ratio was seen to increase from 0.32 to 0.37 after limonene oxidation products had condensed onto the organic seed.
Ključne besede:Aerosol, Aerosol formation, Smog chamber
Leto izida:2011
Št. strani:5917-5929
Številčenje:11, 12
COBISS_ID:5420027 Povezava se odpre v novem oknu
URN:URN:SI:UNG:REP:ZGVE9AP9
DOI:10.5194/acp-11-5917-2011 Povezava se odpre v novem oknu
Licenca:CC BY-SA 4.0
To delo je dosegljivo pod licenco Creative Commons Priznanje avtorstva-Deljenje pod enakimi pogoji 4.0 Mednarodna
Število ogledov:1130
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
Področja:Gradivo ni uvrščeno v področja.
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.

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Gradivo je del revije

Naslov:Atmospheric Chemistry and Physics
Skrajšan naslov:Atmos. Chem. Phys.
Založnik:Copernicus
ISSN:16807316
Leto izida:2011

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