Atmospheric HULIS enhance pollutant degradation by promoting the dark Fenton reaction

Physics

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Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Biogeosciences: Pollution: Urban, Regional And Global (0345, 4251)

Scientific paper

Humic-like substances (HULIS) in the atmosphere are ubiquitous macromolecular substances that comprise a major fraction of the organic component of atmospheric aerosols. In this study we report that HULIS extracted from collected wood burning and urban pollution atmospheric particles enhance aqueous phase oxidation of model organic contaminants (pyrene and phenol), by promoting the dark Fenton reaction under atmospherically relevant conditions. The paucity of radical sources at night makes this reaction, which is not accounted for in cloud chemistry models, potentially quite important for understanding and quantifying in-cloud degradation of organic pollutants, and for understanding Fe oxidation state speciation in atmospheric waters.

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