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Characterization of secondary organic aerosol generated from ozonolysis of α-pinene mixtures
Abstract In the atmosphere, multiple volatile organic compounds (VOCs) co-exist, and they can be oxidized concurrently and generate secondary organic aerosol (SOA). In this work, SOA is formed by the oxidation (in presence of excess ozone) of mixtures containing α-pinene and other VOCs. The VOC mixtures were made so their composition approached a commercially-available α-pinene-based essential oil, Siberian fir needle oil. The SOA products were sampled using filters, solvent extracted and analyzed by gas chromatography/mass spectrometry with trimethylsilyl derivatization. The individual product yields for SOA generated from α-pinene changed upon the addition of other VOCs. An increase in concentration of non-reactive VOCs (bornyl acetate, camphene, and borneol) lead to a decrease in individual product yields of characteristic α-pinene SOA products. Although these experiments were carried out under higher VOC and ozone concentrations in comparison to the atmosphere, this work suggests that the role of non-reactive VOCs should be explored in SOA products formation.
Highlights ► Secondary organic aerosol from volatile organic compound mixtures was characterized. ► Mixtures included a commercially available essential oil. ► Product yields were measured as a function of mixture composition. ► Changes in products yields were observed as the composition was changed.
Characterization of secondary organic aerosol generated from ozonolysis of α-pinene mixtures
Abstract In the atmosphere, multiple volatile organic compounds (VOCs) co-exist, and they can be oxidized concurrently and generate secondary organic aerosol (SOA). In this work, SOA is formed by the oxidation (in presence of excess ozone) of mixtures containing α-pinene and other VOCs. The VOC mixtures were made so their composition approached a commercially-available α-pinene-based essential oil, Siberian fir needle oil. The SOA products were sampled using filters, solvent extracted and analyzed by gas chromatography/mass spectrometry with trimethylsilyl derivatization. The individual product yields for SOA generated from α-pinene changed upon the addition of other VOCs. An increase in concentration of non-reactive VOCs (bornyl acetate, camphene, and borneol) lead to a decrease in individual product yields of characteristic α-pinene SOA products. Although these experiments were carried out under higher VOC and ozone concentrations in comparison to the atmosphere, this work suggests that the role of non-reactive VOCs should be explored in SOA products formation.
Highlights ► Secondary organic aerosol from volatile organic compound mixtures was characterized. ► Mixtures included a commercially available essential oil. ► Product yields were measured as a function of mixture composition. ► Changes in products yields were observed as the composition was changed.
Characterization of secondary organic aerosol generated from ozonolysis of α-pinene mixtures
Amin, Hardik S. (author) / Hatfield, Meagan L. (author) / Huff Hartz, Kara E. (author)
Atmospheric Environment ; 67 ; 323-330
2012-10-31
8 pages
Article (Journal)
Electronic Resource
English
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