Chemistry and Photochemistry of Pyruvic Acid at the Air-Water Interface
| Autor: | Jean-François Doussin, Veronica Vaida, Sandra L. Blair, Keaten J. Kappes, Alexandra M Deal, Edouard Pangui, Malte F. Jespersen, Matthew S. Johnson, Brianna N. Hopper, Mathieu Cazaunau |
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| Přispěvatelé: | Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado [Boulder]-National Oceanic and Atmospheric Administration (NOAA), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), University of Copenhagen = Københavns Universitet (KU), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), University of Copenhagen = Københavns Universitet (UCPH) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Aqueous solution
010304 chemical physics Condensation Context (language use) 010402 general chemistry Photochemistry 01 natural sciences Chemical reaction Oligomer 0104 chemical sciences Lactic acid [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry chemistry.chemical_compound chemistry 13. Climate action Abiogenesis [SDU]Sciences of the Universe [physics] 0103 physical sciences [SDE]Environmental Sciences Molecule Physical and Theoretical Chemistry |
| Zdroj: | Journal of Physical Chemistry A Journal of Physical Chemistry A, American Chemical Society, 2021, 125 (4), pp.1036-1049. ⟨10.1021/acs.jpca.0c09096⟩ Kappes, K J, Deal, A M, Jespersen, M F, Blair, S L, Doussin, J F, Cazaunau, M, Pangui, E, Hopper, B N, Johnson, M S & Vaida, V 2021, ' Chemistry and Photochemistry of Pyruvic Acid at the Air-Water Interface ', Journal of Physical Chemistry A, vol. 125, no. 4, pp. 1036-1049 . https://doi.org/10.1021/acs.jpca.0c09096 Journal of Physical Chemistry A, 2021, 125 (4), pp.1036-1049. ⟨10.1021/acs.jpca.0c09096⟩ |
| ISSN: | 1089-5639 1520-5215 |
| DOI: | 10.1021/acs.jpca.0c09096⟩ |
| Popis: | International audience; Interfacial regions are unique chemical reaction environments that can promote chemistry not found elsewhere. The air–water interface is ubiquitous in the natural environment in the form of ocean surfaces and aqueous atmospheric aerosols. Here we investigate the chemistry and photochemistry of pyruvic acid (PA), a common environmental species, at the air–water interface and compare it to its aqueous bulk chemistry using two different experimental setups: (1) a Langmuir–Blodgett trough, which models natural water surfaces and provides a direct comparison between the two reaction environments, and (2) an atmospheric simulation chamber (CESAM) to monitor the chemical processing of nebulized aqueous PA droplets. The results show that surface chemistry leads to substantial oligomer formation. The sequence begins with the condensation of lactic acid (LA), formed at the surface, with itself and with pyruvic acid, and LA + LA – H2O and LA + PA – H2O are prominent among the products in addition to a series of higher-molecular-weight oligomers of mixed units of PA and LA. In addition, we see zymonic acid at the surface. Actinic radiation enhances the production of the oligomers and produces additional surface-active molecules known from the established aqueous photochemical mechanisms. The presence and formation of complex organic molecules at the air–water interface from a simple precursor like PA in the natural environment is relevant to contemporary atmospheric science and is important in the context of prebiotic chemistry, where abiotic production of complex molecules is necessary for abiogenesis. |
| Databáze: | OpenAIRE |
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