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Isothermal Evaporat...
Isothermal Evaporation of alpha-Pinene Ozonolysis SOA : Volatility, Phase State, and Oligomeric Composition
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D'Ambro, Emma L. (författare)
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Schobesberger, Siegfried (författare)
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Zaveri, Rahul A. (författare)
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Shilling, John E. (författare)
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Lee, Ben Hwan (författare)
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Lopez-Hilfiker, Felipe D. (författare)
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- Mohr, Claudia (författare)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi,University of Washington, United States
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Thornton, Joel A. (författare)
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(creator_code:org_t)
- 2018-09-11
- 2018
- Engelska.
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Ingår i: ACS Earth and Space Chemistry. - : American Chemical Society (ACS). - 2472-3452. ; 2:10, s. 1058-1067
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- mass spectrometry
- secondary organic aerosol
- oligomers
- chamber measurements
- particle multilayer model
- FIGAERO desorption model
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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