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Influence of Humidity, Temperature, and Radicals on the Formation and Thermal Properties of Secondary Organic Aerosol (SOA) from Ozonolysis of β-Pinene

Artikel i vetenskaplig tidskrift
Författare Eva U. Emanuelsson
Ågot Watne
Anna Lutz
Evert Ljungström
Mattias Hallquist
Publicerad i Journal of Physical Chemistry A
Volym 117
Nummer/häfte 40
Sidor 10346 - 10358
ISSN 1089-5639
Publiceringsår 2013
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 10346 - 10358
Språk en
Länkar dx.doi.org/10.1021/jp4010218
Ämnesord Volatility, Terpenes, Flow reactor, Radical chemistry
Ämneskategorier Kemi, Analytisk kemi, Organisk kemi, Fysikalisk organisk kemi, Klimatforskning, Miljövetenskap, Miljökemi, Meteorologi och atmosfärforskning

Sammanfattning

The influence of water and radicals on SOAs produced by β-pinene ozonolysis was investigated at 298 and 288 K using a laminar flow reactor. A volatility tandem differential mobility analyzer (VTDMA) was used to measure the evaporation of the SOA, enabling the parametrization of its volatility properties. The parameters extracted included the temperature at which 50% of the aerosol had evaporated (TVFR0.5) and the slope factor (SVFR). An increase in SVFR indicates a broader distribution of vapor pressures for the aerosol constituents. Reducing the reaction temperature increased SVFR and decreased TVFR0.5 under humid conditions but had less effect on TVFR0.5 under dry conditions. In general, higher water concentrations gave lower TVFR0.5 values, more negative SVFR values, and a reduction in total SOA production. The radical conditions were changed by introducing OH scavengers to generate systems with and without OH radicals and with different [HO2]/[RO2] ratios. The presence of a scavenger and lower [HO2]/[RO2] ratio reduced SOA production. Observed changes in SVFR values could be linked to the more complex chemistry that occurs in the absence of a scavenger and indicated that additional HO2 chemistry gives products with a wider range of vapor pressures. Updates to existing ozonolysis mechanisms with routes that describe the observed responses to water and radical conditions for monoterpenes with endocyclic and exocyclic double bonds are discussed.

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