A Caltech Library Service

Processing of unsaturated carboxylic acids by ozone at the air-water interface: Implications for aerosol aging

Li, Lijie and Colussi, Agustín J. and Enami, Shinichi and Hoffmann, Michael R. (2017) Processing of unsaturated carboxylic acids by ozone at the air-water interface: Implications for aerosol aging. In: 254th American Chemical Society National Meeting & Exposition, August 20-24, 2017, Washington, DC.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


Org. matter contributes 20% to 90% of PM_(2.5) mass concns. in the troposphere. Unsatd. carboxylic acids are widespread in org. aerosols. Double bonds (C=C) in unsatd. species are generally oxidized by electrophilic ozone. In contrast with the ozonation of unsatd. species in the gas phase, the mechanism and products of their ozonation on the surface of aq. org. aerosols are unknown. In the gas-phase, O_3 adds to olefinic double bonds generating chem. activated ozonides, which rapidly decomp. into carbonyl oxide Criegee (CIs) intermediates. The fate of gas-phase Criegee intermediates (CIs) in the troposphere is detd. by their reactions with water and water clusters. Our recent studies on the CIs produced on air-water interfaces (AWIs) by the in situ ozonation of sesquiterpenes have showed that millimolar n-alkyl-COOH acids are able to compete for CIs with water. In this work, we investigate the ozonation of unsatd. carboxylic acids at air-water interface. Our work focuses on the impacts of mol. structure on the products of the interfacial ozonation of unsatd. carboxylic acid by O_3(g). Our studies were conducted by means of our online electrospray mass spectrometry (o-ESI-MS), which probes the compn. of reactive interfacial layers within 1 ms. We have used o-ESI-MS to investigate for the first time the ozonation of various aerosol components at the AWIs, such as phenol, α-humulene and β-caryophyllene. In this study, we explore the intramol. and intermol. products from reactions of the CIs derived from the interfacial ozonation of various unsatd. carboxylic acids. We present results on how products depend on the alkene structure (cyclic or linear) and the sepn. of olefinic double bonds from the -COOH functionality. The competition between intramol. and intermol. addn. of -COOH and the reaction of CIs with H_2O is discussed. This work evaluates the contribution of different unsatd. carboxylic acids to aerosol aging and the potential pathways to extremely low volatility org. compds. (ELVOCs) through multiphase reactions.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Website
Li, Lijie0000-0002-7988-6208
Colussi, Agustín J.0000-0002-3400-4101
Enami, Shinichi0000-0002-2790-7361
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2017 American Chemical Society.
Record Number:CaltechAUTHORS:20170911-111125979
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81292
Deposited By: Tony Diaz
Deposited On:11 Sep 2017 18:18
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page