Issue 4, 2017

Water vapour effects on secondary organic aerosol formation in isoprene ozonolysis

Abstract

Secondary organic aerosol (SOA) formation from isoprene ozonolysis was investigated using a Teflon bag reactor under dry and humid conditions. Both the number and volume concentrations of SOA were found to be decreased by the addition of water vapour. Gas- and particle-phase product analyses with a negative ion chemical ionization mass spectrometer show that oligomers composed of stabilized Criegee intermediates as the chain units contribute to the SOA formation and that water vapour inhibits stabilized Criegee intermediates from forming the oligomers, resulting in the suppression of SOA formation. Additionally, it is suggested that a portion of stabilized Criegee intermediates other than CH2OO have low reactivity toward H2O, and thus can be involved in the oligomer and SOA formation even under humid conditions. Volatility estimation predicts that the oligomers containing even one or two stabilized Criegee intermediates can be partitioned into the aerosol phase.

Graphical abstract: Water vapour effects on secondary organic aerosol formation in isoprene ozonolysis

Supplementary files

Article information

Article type
Paper
Submitted
28 Jun 2016
Accepted
12 Dec 2016
First published
12 Dec 2016

Phys. Chem. Chem. Phys., 2017,19, 3165-3175

Water vapour effects on secondary organic aerosol formation in isoprene ozonolysis

Y. Sakamoto, R. Yajima, S. Inomata and J. Hirokawa, Phys. Chem. Chem. Phys., 2017, 19, 3165 DOI: 10.1039/C6CP04521A

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