Articles | Volume 16, issue 6
https://doi.org/10.5194/acp-16-3865-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acp-16-3865-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Oxidative potential of ambient water-soluble PM2.5 in the southeastern United States: contrasts in sources and health associations between ascorbic acid (AA) and dithiothreitol (DTT) assays
Ting Fang
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
Vishal Verma
Department of Civil and Environmental Engineering, University of Illinois Urbana-Champaign, Champaign, IL 61801, USA
Josephine T. Bates
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Joseph Abrams
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
Mitchel Klein
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
Matthew J. Strickland
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
Stefanie E. Sarnat
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
Howard H. Chang
Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
James A. Mulholland
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Paige E. Tolbert
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
Armistead G. Russell
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Rodney J. Weber
CORRESPONDING AUTHOR
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
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Short summary
Ascorbic acid (AA) and Dithiothreitol (DTT) assay measures of water-soluble PM2.5 oxidative potential (OP) are compared in terms of spatiotemporal trends, chemical selectivity, sources, and health impacts based on an epidemiological study with backcast estimated OP. Both assays point to metals from brake/tire wear, but only the DTT assay also identifies organics from combustion. DTT is associated with emergency department visits for asthma/wheeze and congestive heart failure, whereas AA is not.
Ascorbic acid (AA) and Dithiothreitol (DTT) assay measures of water-soluble PM2.5 oxidative...
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