AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
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Acellular Sources of Reactive Oxygen Species (ROS): Links between In Situ Ambient and Laboratory Quantifications of Different Emission Sources
JUN ZHOU, Miriam Elser, Manuel Krapf, Roman Fröhlich, Deepika Bhattu, Giulia Stefenelli, Peter Zotter, Emily Bruns, Simone Pieber, Haiyan Ni, Qiyuan Wang, Yichen Wang, Jay G. Slowik, Thomas Nussbaumer, Marianne Geiser, Andre S.H. Prévôt, Urs Baltensperger, Imad EI Haddad, Rujin Huang, Josef Dommen, Paul Scherrer Institute
Abstract Number: 359 Working Group: Health Related Aerosols
Abstract Aerosols affect human health through their oxidative potential (OP), which causes oxidative stress and consequently variable diseases when intracellular reactive oxygen species (ROS) overwhelm antioxidants in the body. However, the OP of different types of particulate matter (PM) to induce oxidative stress when inhaled is largely unknown. In this study, a high resolution aerosol mass spectrometer and an online ROS analyzer based on the 2’,7’-dichlorofluorescin (DCFH) assay were employed to study the variable chemical nature and the OP of PM generated from different sources. These sources included primary and secondary organic aerosols from biogenic as well as anthropogenic emissions, which were generated under different conditions and aged in atmospheric photochemical reaction simulators. Additionally, ambient PM in two contrasting locations, Beijing (China) and Bern (Switzerland), was investigated. A novel positive matrix factorization procedure was used to apportion the sources of organic aerosols (OA). A model was then established to attribute the observed ROS to different sources. The main parameters affecting ROS formation were determined and the particles’ OP of different emission sources obtained was reconfirmed based on laboratory-characterized sources of OA. This study provides reliable evidence to infer the OP of aerosols at different ambient locations.