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Article Dans Une Revue Environmental Science and Technology Année : 2016

Mechanistic Insights on the Photosensitized Chemistry of a Fatty Acid at the Air/Water Interface

Résumé

Interfaces are ubiquitous in the environment and many atmospheric key processes, such as gas deposition, aerosol, and cloud formation are, at one stage or another, strongly impacted by physical and chemical processes occurring at interfaces. Here, the photoinduced chemistry of an air/water interface coated with nonanoic acid—a fatty acid surfactant we use as a proxy for chemically complex natural aqueous surface microlayers—was investigated as a source of volatile and semivolatile reactive organic species. The carboxylic acid coating significantly increased the propensity of photosensitizers, chosen to mimic those observed in real environmental waters, to partition to the interface and enhance reactivity there. Photochemical formation of functionalized and unsaturated compounds was systematically observed upon irradiation of these coated surfaces. The role of a coated interface appears to be critical in providing a concentrated medium allowing radical–radical reactions to occur in parallel with molecular oxygen additions. Mechanistic insights are provided from extensive analysis of products observed in both gas and aqueous phases by online switchable reagent ion-time of flight-mass spectrometry and by off-line ultraperformance liquid chromatography coupled to a Q Exactive high resolution mass spectrometer through heated electrospray ionization, respectively.

Domaines

Chimie

Dates et versions

hal-01476237 , version 1 (12-04-2021)

Identifiants

Citer

Liselotte Tinel, Stéphanie Rossignol, Angelica Bianco, Monica Passananti, Sébastien Perrier, et al.. Mechanistic Insights on the Photosensitized Chemistry of a Fatty Acid at the Air/Water Interface. Environmental Science and Technology, 2016, 50, pp.11041-11048. ⟨10.1021/acs.est.6b03165⟩. ⟨hal-01476237⟩
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