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Highly acidic ambient particles, soluble metals and oxidative potential: A link between sulfate and aerosol toxicity Ting Fang, Hongyu Guo, Linghan Zeng, Vishal Verma, Athanasios Nenes, and Rodney J. Weber Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.6b06151 • Publication Date (Web): 31 Jan 2017 Downloaded from http://pubs.acs.org on February 6, 2017
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Environmental Science & Technology
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Highly acidic ambient particles, soluble metals and oxidative
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potential: A link between sulfate and aerosol toxicity
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Ting Fanga, Hongyu Guoa, Linghan Zenga, Vishal Vermab, Athanasios Nenesa,c,d,e, Rodney J.
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Webera,*
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[a] School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
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[b] Department of Civil and Environmental Engineering, University of Illinois UrbanaChampaign, Champaign, IL, 61801, USA.
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[c] School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
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[d] Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR26504, Patras, Greece.
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[e] Institute for Environmental Research and Sustainable Development, National Observatory of Athens, GR-15236, Palea Penteli, Greece.
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Corresponding author Professor Rodney J. Weber, Ph.D. Georgia Institute of Technology School of Earth and Atmospheric Sciences 311 Ferst Drive Atlanta GA, 30332 office phone: 404.894.1750 Email:
[email protected] 1 ACS Paragon Plus Environment
Environmental Science & Technology
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Abstract
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Soluble transition metals in particulate matter (PM) can generate reactive oxygen species in vivo
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by redox cycling, leading to oxidative stress and adverse health effects. Most metals, such as
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those from roadway traffic, are emitted in an insoluble form, but must be soluble for redox
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cycling. Here we present the mechanism of metals dissolution by highly acidic sulfate aerosol
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and the effect on particle oxidative potential (OP) through analysis of size distributions. Size-
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segregated ambient PM were collected from a road-side and representative urban site in Atlanta,
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GA. Elemental and organic carbon, ions, total and water-soluble metals, and water-soluble OP
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were measured. Particle pH was determined with a thermodynamic model using measured ionic
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species. Sulfate was spatially uniform and found mainly in the fine mode, whereas total metals
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and mineral dust cations were highest at the road-side site and in the coarse mode, resulting in a
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fine mode pH
