Secondary organic aerosol from VOC mixtures in an oxidation flow reactor

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Ahlberg , E , Falk , J , Eriksson , A , Holst , T , Brune , W H , Kristensson , A , Roldin , P & Svenningsson , B 2017 , ' Secondary organic aerosol from VOC mixtures in an oxidation flow reactor ' , Atmospheric Environment , vol. 161 , pp. 210-220 . https://doi.org/10.1016/j.atmosenv.2017.05.005

Title: Secondary organic aerosol from VOC mixtures in an oxidation flow reactor
Author: Ahlberg, Erik; Falk, John; Eriksson, Axel; Holst, Thomas; Brune, William H.; Kristensson, Adam; Roldin, Pontus; Svenningsson, Birgitta
Contributor: University of Helsinki, Department of Physics
Date: 2017-07
Language: eng
Number of pages: 11
Belongs to series: Atmospheric Environment
ISSN: 1352-2310
URI: http://hdl.handle.net/10138/224425
Abstract: The atmospheric organic aerosol is a tremendously complex system in terms of chemical content. Models generally treat the mixtures as ideal, something which has been questioned owing to model-measurement discrepancies. We used an oxidation flow reactor to produce secondary organic aerosol (SOA) mixtures containing oxidation products of biogenic (alpha-pinene, myrcene and isoprene) and anthropogenic (m-xylene) volatile organic compounds (VOCs). The resulting volume concentration and chemical composition was measured using a scanning mobility particle sizer (SMPS) and a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS), respectively. The SOA mass yield of the mixtures was compared to a partitioning model constructed from single VOC experiments. The single VOC SOA mass yields with no wall-loss correction applied are comparable to previous experiments. In the mixtures containing myrcene a higher yield than expected was produced. We attribute this to an increased condensation sink, arising from myrcene producing a significantly higher number of nucleation particles compared to the other precursors. Isoprene did not produce much mass in single VOC experiments but contributed to the mass of the mixtures. The effect of high concentrations of isoprene on the OH exposure was found to be small, even at OH reactivities that previously have been reported to significantly suppress OH exposures in oxidation flow reactors. Furthermore, isoprene shifted the particle size distribution of mixtures towards larger sizes, which could be due to a change in oxidant dynamics inside the reactor. (C) 2017 The Authors. Published by Elsevier Ltd.
Subject: Secondary organic aerosol
Oxidation flow reactor
VOC mixtures
SOA yield
CLOUD CONDENSATION NUCLEI
GAS-PHASE PRODUCTS
MASS-SPECTROMETRY
HIGH-RESOLUTION
SOA FORMATION
PARTICLE FORMATION
ISOPRENE PHOTOOXIDATION
ELEMENTAL COMPOSITION
CHEMICAL-COMPOSITION
BIOGENIC EMISSIONS
114 Physical sciences
116 Chemical sciences
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