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© 2023. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Oxidative stress is a mechanism that might raise the toxicity of mineral dust aerosols. We evaluated the oxidative potential (OP) of four reference materials (RMs) of mineral dusts using dithiothreitol assay. The OP of the water-soluble fraction of the dust RMs accounts for 40%–70% of the OP of the total fraction. The values of total and water-soluble OP normalized by the surface area of insoluble particles showed agreement among the different dust RMs. The surface area of insoluble dust particles was therefore inferred as an important factor affecting the OP of mineral dust. Using the relation between total OP and the surface area of insoluble particles of the dust RMs, we estimated the total OPs of fine and coarse atmospheric mineral dust aerosols assuming a typical particle size distribution of Asian dust aerosols observed in Japan. Mass-normalized total OPs were estimated at 44 and 23 pmol min−1 μg−1 for fine and coarse atmospheric mineral dust particles. They closely approximate the values observed for urban aerosols in Japan, which suggests that mineral dust plume advection can lead to a marked increase in human exposure to redox-active aerosols, even far downwind from mineral dust source regions.

Details

Title
Dithiothreitol-Measured Oxidative Potential of Reference Materials of Mineral Dust: Implications for the Toxicity of Mineral Dust Aerosols in the Atmosphere
Author
Nishita-Hara, Chiharu 1   VIAFID ORCID Logo  ; Kobayashi, Hiroshi 2 ; Hara, Keiichiro 3   VIAFID ORCID Logo  ; Hayashi, Masahiko 3 

 Fukuoka Institute for Atmospheric Environment and Health, Fukuoka University, Fukuoka, Japan 
 Division of Life and Environmental Sciences, University of Yamanashi, Kofu, Japan 
 Fukuoka Institute for Atmospheric Environment and Health, Fukuoka University, Fukuoka, Japan; Department of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka, Japan 
Section
Research Article
Publication year
2023
Publication date
Jul 2023
Publisher
John Wiley & Sons, Inc.
e-ISSN
24711403
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2842525032
Copyright
© 2023. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.