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Article
Highly Elevated Levels and Particle-Size Distributions of Environmentally Persistent Free Radicals in Haze-Associated Atmosphere Li Li Yang, Guorui Liu, Minghui Zheng, Rong Jin, Qingqing Zhu, Yuyang Zhao, Xiaolin Wu, and Yang Xu Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.7b01929 • Publication Date (Web): 14 Jun 2017 Downloaded from http://pubs.acs.org on June 16, 2017
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Environmental Science & Technology
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Highly Elevated Levels and Particle-Size Distributions of Environmentally
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Persistent Free Radicals in Haze-Associated Atmosphere
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Lili Yang†,‡, Guorui Liu†,‡,*, Minghui Zheng†,‡,*, Rong Jin†,‡, Qingqing Zhu†,‡, Yuyang Zhao†,‡,
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Xiaolin Wu†,‡, Yang Xu†,‡
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†
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Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085,
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China;
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‡
University of Chinese Academy of Sciences, Beijing 100049, China
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*
Corresponding author.
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E-mail:
[email protected] (Guorui Liu); Tel: 010-62949356
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[email protected] (Minghui Zheng); Tel: 010-62849172
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for
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ACS Paragon Plus Environment
Environmental Science & Technology
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ABSTRACT
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Levels and particle-size distributions of environmentally persistent free radicals (EPFRs) in
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haze-associated atmospheric particulate matter (PM) have not been highlighted, even though
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they may enter the human body along with PM and adversely affect human health. This study
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quantified the levels of EPFRs in airborne PM with different aerodynamic diameters (dae) using
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electron paramagnetic resonance (EPR) spectroscopy. EPR spectra showed a single, unstructured
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signal from persistent semiquinone radicals. The average concentration of EPFRs in the airborne
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PM during haze events was 2.18×1220 spins/g (range: 3.06×1019–6.23×1020 spins/g),
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approximately two orders of magnitude higher than that reported previously in the US
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atmosphere. Particle-size distributions of EPFRs in four different PM fractions (dae>10 µm, 10
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µm
