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Molecular compositi...
Molecular composition and volatility of isoprene photochemical oxidation secondary organic aerosol under low- and high-NOx conditions
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D'Ambro, E. L. (author)
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Lee, B. H. (author)
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Liu, J. M. (author)
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Shilling, J. E. (author)
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Gaston, C. J. (author)
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Lopez-Hilfiker, F. D. (author)
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Schobesberger, S. (author)
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Zaveri, R. A. (author)
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Mohr, C. (author)
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- Lutz, Anna, 1986 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
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Zhang, Z. F. (author)
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Gold, A. (author)
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Surratt, J. D. (author)
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Rivera-Rios, J. C. (author)
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Keutsch, F. N. (author)
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Thornton, J. A. (author)
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(creator_code:org_t)
- 2017-01-04
- 2017
- English.
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In: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 17:1, s. 159-174
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Abstract
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- We present measurements of secondary organic aerosol (SOA) formation from isoprene photochemical oxidation in an environmental simulation chamber at a variety of oxidant conditions and using dry neutral seed particles to suppress acid-catalyzed multiphase chemistry. A high-resolution time-of-flight chemical ionization mass spectrometer (HR-ToF-CIMS) utilizing iodide-adduct ionization coupled to the Filter Inlet for Gases and Aerosols (FIGAERO) allowed for simultaneous online sampling of the gas and particle composition. Under high-HO2 and low-NO conditions, highly oxygenated (O : C >= 1) C-5 compounds were major components (similar to 50 %) of SOA. The SOA composition and effective volatility evolved both as a function of time and as a function of input NO concentrations. Organic nitrates increased in both the gas and particle phases as input NO increased, but the dominant non-nitrate particle-phase components monotonically decreased. We use comparisons of measured and predicted gas-particle partitioning of individual components to assess the validity of literature-based group-contribution methods for estimating saturation vapor concentrations. While there is evidence for equilibrium partitioning being achieved on the chamber residence timescale (5.2 h) for some individual components, significant errors in group-contribution methods are revealed. In addition, >30% of the SOA mass, detected as low-molecular-weight semivolatile compounds, cannot be reconciled with equilibrium partitioning. These compounds desorb from the FIGAERO at unexpectedly high temperatures given their molecular composition, which is indicative of thermal decomposition of effectively lower-volatility components such as larger molecular weight oligomers.
Subject headings
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Organisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Organic Chemistry (hsv//eng)
Keyword
- southeastern united-states
- vapor-pressure estimation
- alpha-pinene
- reactive uptake
- soa formation
- 2-methylglyceric acid
- biogenic
- emissions
- epoxide formation
- cross-sections
- photooxidation
- Meteorology & Atmospheric Sciences
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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D'Ambro, E. L.
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Lee, B. H.
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Liu, J. M.
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Shilling, J. E.
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Gaston, C. J.
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Lopez-Hilfiker, ...
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show more...
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Schobesberger, S ...
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Zaveri, R. A.
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Mohr, C.
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Lutz, Anna, 1986
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Zhang, Z. F.
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Gold, A.
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Surratt, J. D.
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Rivera-Rios, J. ...
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Keutsch, F. N.
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Thornton, J. A.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Analytical Chemi ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Organic Chemistr ...
- Articles in the publication
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Atmospheric Chem ...
- By the university
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University of Gothenburg