Influence of aerosol acidity and organic ligands on transition metal solubility and oxidative potential of fine particulate matter in urban environments.

Autor: Shahpoury P; Environmental and Life Sciences, Trent University, Peterborough, Canada; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany. Electronic address: pshahpoury@trentu.ca., Lelieveld S; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany., Johannessen C; Environmental and Life Sciences, Trent University, Peterborough, Canada., Berkemeier T; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany., Celo V; Analysis and Air Quality Section, Environment and Climate Change Canada, Ottawa, Canada., Dabek-Zlotorzynska E; Analysis and Air Quality Section, Environment and Climate Change Canada, Ottawa, Canada., Harner T; Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, Canada., Lammel G; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany., Nenes A; Laboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Switzerland; Center for the Study of Air Quality and Climate Change, Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras, Greece.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Jan 01; Vol. 906, pp. 167405. Date of Electronic Publication: 2023 Sep 29.
DOI: 10.1016/j.scitotenv.2023.167405
Abstrakt: The adverse health effects of air pollution around the world have been associated with the inhalation of fine particulate matter (PM 2.5 ). Such outcomes are thought to be related to the induction of oxidative stress due to the excess formation of reactive oxygen species (ROS) in the respiratory and cardiovascular systems. The ability of airborne chemicals to deplete antioxidants and to form ROS is known as oxidative potential (OP). Here we studied the influence of aerosol acidity and organic ligands on the solubility of transition metals, in particular iron (Fe) and copper (Cu), and on the OP of PM 2.5 from Canadian National Air Pollution Surveillance urban sites in Toronto, Vancouver, and Hamilton. Using chemical assays and model simulations of the lung redox chemistry, we quantified ROS formation in the lung lining fluid, targeting superoxide anion (O 2 •- ), hydrogen peroxide (H 2 O 2 ), and hydroxyl radical ( • OH), as well as the PM 2.5 redox potential (RP). Experimental • OH formation (OP OH ) showed high correlations with RP and model-predicted ROS metrics. Both aerosol acidity and oxalate content enhanced the solubility of transition metals, with oxalate showing a stronger association. While experimental OP metrics were primarily associated with species of primary origin such as elemental carbon, Fe, and Cu, model-predicted ROS were associated with secondary processes including proton- and ligand-mediated dissolution of Fe. Model simulations showed that water-soluble Cu was the main contributor to O 2 •- formation, while water-soluble Fe dominated the formation of highly reactive • OH radical, particularly at study sites with highly acidic aerosol and elevated levels of oxalate. This study underscores the importance of reducing transition metal emissions in urban environments to improve population health.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Crown Copyright © 2023. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: