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  Reactive species formed upon interaction of water with fine particulate matter from remote forest and polluted urban air

Tong, H., Liu, F., Filippi, A., Wilson, J., Arangio, A. M., Zhang, Y., et al. (2020). Reactive species formed upon interaction of water with fine particulate matter from remote forest and polluted urban air. Atmospheric Chemistry and Physics Discussions, 20. doi:10.5194/acp-2020-973.

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Tong, Haijie1, Author              
Liu, Fobang1, Author              
Filippi, Alexander1, Author              
Wilson, Jake1, Author              
Arangio, Andrea M.1, Author              
Zhang, Yun, Author
Yue, Siyao, Author
Lelieveld, Steven1, Author              
Shen, Fangxia1, Author              
Keskinen, Helmi-Marja K., Author
Li, Jing, Author
Chen, Haoxuan, Author
Zhang, Ting, Author
Hoffmann, Thorsten, Author
Fu, Pingqing, Author
Brune, William H., Author
Petäjä, Tuukka, Author
Kulmala, Markku, Author
Yao, Maosheng, Author
Berkemeier, Thomas1, Author              
Shiraiwa , Manabu, AuthorPöschl, Ulrich1, Author               more..
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: Interaction of water with fine particulate matter leads to the formation of reactive species (RS) that may influence the aging, properties, and health effects of atmospheric aerosols. In this study, we explore the RS yields of fine PM from remote forest (Hyytiälä, Finland) and polluted urban air (Mainz, Germany and Beijing, China) and relate these yields to different chemical constituents and reaction mechanisms. Ultrahigh-resolution mass spectrometry was used to characterize organic aerosol composition, electron paramagnetic resonance (EPR) spectroscopy with a spin-trapping technique was used to determine the concentrations •OH, O2•−, and carbon- or oxygen-centered organic radicals, and a fluorometric assay was used to quantify H2O2 concentration. The mass-specific yields of radicals were lower for sampling sites with higher concentration of ambient PM2.5 (particles with a diameter < 2.5 µm), whereas the H2O2 yields exhibited no clear trend. The abundances of water-soluble transition metals and aromatics in ambient PM2.5 were positively correlated with the relative fraction of •OH to the totally detected radicals, but negatively correlated with the relative fraction of carbon-centered radicals. Moreover, we found that the relative fractions of different types of radicals formed by ambient PM2.5 were comparable to the surrogate mixtures comprising transition metals, organic hydroperoxide, H2O2, and humic or fulvic acids. Therein humic and fulvic acids exhibited strong radical scavenging effect to substantially decrease the radical yield of mixtures comprising cumene hydroperoxide and Fe2+. The interplay of transition metals (e.g., iron), highly oxidized compounds (e.g., organic hydroperoxides), and complexing agents (e.g., humic or fulvic acids), leads to non-linear concentration dependencies of production and yields of different types of RS. Our findings show that how the composition of PM2.5 influences the amount and nature of RS produced upon interaction with water, which may explain differences in the chemical reactivity and health effects of particulate matter in clean and polluted air.

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Language(s): eng - English
 Dates: 2020-10-20
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.5194/acp-2020-973
 Degree: -

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Title: Atmospheric Chemistry and Physics Discussions
  Abbreviation : Atmos. Chem. Phys. Discuss.
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : European Geophysical Society, Copernicus Publ.
Pages: 40 Volume / Issue: 20 Sequence Number: - Start / End Page: - Identifier: ISSN: 1680-7367
CoNE: https://pure.mpg.de/cone/journals/resource/111076360006006