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

Abstract

This work investigated seasonal variation of aerosol iron (Fe) solubility for coarse (>1 µm) and fine (<1 µm) particles at Xi'an, a megacity in northwestern China impacted by anthropogenic emission and desert dust. Total Fe concentrations were lowest in summer and were similar in other seasons for coarse particles but lowest in summer and highest in spring for fine particles; for comparison, dissolved Fe concentrations were higher in fall and winter than spring and summer for coarse particles but highest in winter and lowest in spring and summer for fine particles. Desert-dust aerosol was always the major source of total Fe for both coarse and fine particles in all four seasons, but it may not be the dominant source of dissolved Fe. Fe solubility was lowest in spring for both coarse and fine particles and highest in winter for coarse particles and in fall for fine particles. In general, aerosol Fe solubility was found to be higher in air masses originating from local and nearby regions than those arriving from desert regions after long-distance transport. Compared to coarse particles, Fe solubility was similar for fine particles in spring but significantly higher in the other three seasons, and at a given aerosol pH range, Fe solubility was always higher in fine particles. Aerosol Fe solubility was well correlated with relative abundance of aerosol acidic species, implying aerosol Fe solubility enhancement by acid processing; moreover, such correlations were better for coarse particles than fine particles in all four seasons. Fe solubility was found to increase with relative humidity and acid acidity for both coarse and fine particles at Xi'an, underscoring the importance of aerosol liquid water and aerosol acidity in regulating Fe solubility via chemical processing.

Details

Title
Seasonal variation of aerosol iron solubility in coarse and fine particles at an inland city in northwestern China
Author
Zhang, Huanhuan 1 ; Li, Rui 2 ; Huang, Chengpeng 3 ; Li, Xiaofei 4 ; Dong, Shuwei 2 ; Wang, Fu 3 ; Li, Tingting 2   VIAFID ORCID Logo  ; Chen, Yizhu 2 ; Zhang, Guohua 2   VIAFID ORCID Logo  ; Ren, Yan 3 ; Chen, Qingcai 4   VIAFID ORCID Logo  ; Ru-jin, Huang 5 ; Chen, Siyu 6 ; Xue, Tao 7 ; Wang, Xinming 2   VIAFID ORCID Logo  ; Tang, Mingjin 1   VIAFID ORCID Logo 

 State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China 
 State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China 
 Longhua Center for Disease Control and Prevention of Shenzhen, Shenzhen, China 
 School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, China 
 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China 
 College of Atmospheric Sciences, Lanzhou University, Lanzhou, China 
 School of Public Health, Peking University, Beijing, China 
Pages
3543-3559
Publication year
2023
Publication date
2023
Publisher
Copernicus GmbH
ISSN
16807316
e-ISSN
16807324
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2789188225
Copyright
© 2023. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.