Quantification of Particle-Bound Organic Radicals in Secondary Organic Aerosol

Campbell, Steven J. and Stevanovic, Svetlana and Miljevic, Branka and Bottle, Steven E. and Ristovski, Zoran and Kalberer, Markus. (2019) Quantification of Particle-Bound Organic Radicals in Secondary Organic Aerosol. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 53 (12). pp. 6729-6737.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/74337/

Downloads: Statistics Overview


The chemical composition and evolution of secondary organic aerosol (SOA) in the atmosphere represents one of the largest uncertainties in our current understanding of air quality. Despite vast research, the toxicological mechanisms relating to adverse human health effects upon exposure to particulate matter are still poorly understood. Particle-bound reactive oxygen species (ROS) may substantially contribute to observed health effects by influencing aerosol oxidative potential (OP). The role of radicals in both the formation and aging of aerosol, as well as their contribution to aerosol OP, remains highly uncertain. The profluorescent spin trap BPEAnit (9,10-bis-(phenylethynyl)anthracenenitroxide), previously utilized to study combustion-generated aerosol, has been applied to provide the first estimate of particle-bound radical concentrations in SOA. We demonstrate that SOA from different atmospherically important VOC precursors have different particle-bound radical concentrations, estimated for the ozonolysis of alpha-pinene (0.020 +/- 0.0050 nmol/mu g), limonene (0.0059 +/- 0.0010 nmol/mu g), and beta-caryophyllene (0.0025 +/- 0.00080 nmol/mu g), highlighting the potential importance of OH-initiated formation of particle-bound organic radicals. Additionally, the lifetime of particle-bound radical species in alpha-pinene SOA was estimated, and a pseudo-first-order rate constant of k = 7.3 +/- 1.7 x 10(-3) s(-1) was derived, implying a radical lifetime on the order of minutes.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Atmospheric Sciences (Kalberer)
UniBasel Contributors:Kalberer, Markus and Campbell, Steven John
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:27 May 2020 10:06
Deposited On:27 May 2020 10:06

Repository Staff Only: item control page