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Isothermal Evaporation of alpha-Pinene Ozonolysis SOA: Volatility, Phase State, and Oligomeric Composition
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Antal upphovsmän: 82018 (Engelska)Ingår i: ACS earth and space chemistry, ISSN 2472-3452, Vol. 2, nr 10, s. 1058-1067Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present measurements of the isothermal evaporation of alpha-pinee ozonolysis secondary organic aerosol (SOA). Using a novel, filter-based method, we reproduce literature observations of the time-dependent evaporation of SOA particles. We apply two detailed physical models to interpret the evaporative behavior of both the bulk SOA and individual components. Both models find that a combination of effectively nonvolatile products, together with reversibly formed oligomers (or otherwise reactive monomers) having a decomposition lifetime of 9 to 28 h, best explains the evolution of composition and volatility as particles age in the absence of both organic vapors and oxidants, even under an assumption of relatively viscous (soft wax-like with a minimum diffusion coefficient of 1 x 10(-5) cm(2) s(-1)) particles. We find that the residence time in the SOA formation chamber and time spent undergoing isothermal evaporation, both indicative of the physical age of the aerosol, are the most important experimental parameters determining the evaporation rate. The evolution of volatility observed in these experiments is compared to field measurements in a boreal forest site. The ambient monoterpene-dominated SOA volatility is only reproduced in the laboratory after 24 h of extended aging in a dilute, dark, oxidant-free environment.

Ort, förlag, år, upplaga, sidor
2018. Vol. 2, nr 10, s. 1058-1067
Nyckelord [en]
mass spectrometry, secondary organic aerosol, oligomers, chamber measurements, particle multilayer model, FIGAERO desorption model
Nationell ämneskategori
Kemi Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-161993DOI: 10.1021/acsearthspacechem.8b00084ISI: 000448087400010OAI: oai:DiVA.org:su-161993DiVA, id: diva2:1264249
Tillgänglig från: 2018-11-19 Skapad: 2018-11-19 Senast uppdaterad: 2019-12-09Bibliografiskt granskad

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Mohr, Claudia
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Institutionen för miljövetenskap och analytisk kemi
KemiGeovetenskap och miljövetenskap

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