Atmospheric Simulation Chamber Studies of the Gas-Phase Photolysis of Pyruvic Acid.
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| Title: | Atmospheric Simulation Chamber Studies of the Gas-Phase Photolysis of Pyruvic Acid. |
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| Authors: | Harris, Allison E. Reed1, Cazaunau, Mathieu2, Gratien, Aline2, Pangui, Edouard2, Doussin, Jean-François2 Jean-Francois.Doussin@lisa.u-pec.fr, Vaida, Veronica1 Vaida@colorado.edu |
| Source: | Journal of Physical Chemistry A. 11/9/2017, Vol. 121 Issue 44, p8348-8358. 11p. |
| Subjects: | Pyruvic acid, Gas phase reactions, Troposphere, Photolysis (Chemistry), Acetaldehyde |
| Abstract: | Pyruvic acid is an atmospherically abundant α-keto-acid that degrades efficiently from the troposphere via gas-phase photolysis. To explore conditions relevant to the environment, 2-12 ppm pyruvic acid is irradiated by a solar simulator in the environmental simulation chamber, CESAM. The combination of the long path length available in the chamber and its low surface area to volume ratio allows us to quantitatively examine the quantum yield and photochemical products of pyruvic acid. Such details are new to the literature for the low initial concentrations of pyruvic acid employed here. We determined photolysis quantum yields of ϕobsN2 = 0.84 ± 0.1 in nitrogen and ϕobsAir = 3.2 ± 0.5 in air, which are higher than those reported by previous studies that used higher partial pressures of pyruvic acid. The quantum yield greater than unity in air is due to secondary chemistry, driven by O2, that emerges under the conditions in these experiments. The low concentration of pyruvic acid and the resulting oxygen effect also alter the product distribution such that acetic acid, rather than acetaldehyde, is the primary product in air. These results indicate that tropospheric pyruvic acid may degrade in part via photoinduced mechanisms that are different than previously expected. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Physical Chemistry A is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 126240015 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Atmospheric Simulation Chamber Studies of the Gas-Phase Photolysis of Pyruvic Acid. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Harris%2C+Allison+E%2E+Reed%22">Harris, Allison E. Reed</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cazaunau%2C+Mathieu%22">Cazaunau, Mathieu</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gratien%2C+Aline%22">Gratien, Aline</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pangui%2C+Edouard%22">Pangui, Edouard</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Doussin%2C+Jean-François%22">Doussin, Jean-François</searchLink><relatesTo>2</relatesTo><i> Jean-Francois.Doussin@lisa.u-pec.fr</i><br /><searchLink fieldCode="AR" term="%22Vaida%2C+Veronica%22">Vaida, Veronica</searchLink><relatesTo>1</relatesTo><i> Vaida@colorado.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Physical+Chemistry+A%22">Journal of Physical Chemistry A</searchLink>. 11/9/2017, Vol. 121 Issue 44, p8348-8358. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Pyruvic+acid%22">Pyruvic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+phase+reactions%22">Gas phase reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Troposphere%22">Troposphere</searchLink><br /><searchLink fieldCode="DE" term="%22Photolysis+%28Chemistry%29%22">Photolysis (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Acetaldehyde%22">Acetaldehyde</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Pyruvic acid is an atmospherically abundant α-keto-acid that degrades efficiently from the troposphere via gas-phase photolysis. To explore conditions relevant to the environment, 2-12 ppm pyruvic acid is irradiated by a solar simulator in the environmental simulation chamber, CESAM. The combination of the long path length available in the chamber and its low surface area to volume ratio allows us to quantitatively examine the quantum yield and photochemical products of pyruvic acid. Such details are new to the literature for the low initial concentrations of pyruvic acid employed here. We determined photolysis quantum yields of ϕobsN2 = 0.84 ± 0.1 in nitrogen and ϕobsAir = 3.2 ± 0.5 in air, which are higher than those reported by previous studies that used higher partial pressures of pyruvic acid. The quantum yield greater than unity in air is due to secondary chemistry, driven by O2, that emerges under the conditions in these experiments. The low concentration of pyruvic acid and the resulting oxygen effect also alter the product distribution such that acetic acid, rather than acetaldehyde, is the primary product in air. These results indicate that tropospheric pyruvic acid may degrade in part via photoinduced mechanisms that are different than previously expected. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Physical Chemistry A is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1021/acs.jpca.7b05139 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 8348 Subjects: – SubjectFull: Pyruvic acid Type: general – SubjectFull: Gas phase reactions Type: general – SubjectFull: Troposphere Type: general – SubjectFull: Photolysis (Chemistry) Type: general – SubjectFull: Acetaldehyde Type: general Titles: – TitleFull: Atmospheric Simulation Chamber Studies of the Gas-Phase Photolysis of Pyruvic Acid. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Harris, Allison E. Reed – PersonEntity: Name: NameFull: Cazaunau, Mathieu – PersonEntity: Name: NameFull: Gratien, Aline – PersonEntity: Name: NameFull: Pangui, Edouard – PersonEntity: Name: NameFull: Doussin, Jean-François – PersonEntity: Name: NameFull: Vaida, Veronica IsPartOfRelationships: – BibEntity: Dates: – D: 09 M: 11 Text: 11/9/2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 10895639 Numbering: – Type: volume Value: 121 – Type: issue Value: 44 Titles: – TitleFull: Journal of Physical Chemistry A Type: main |
| ResultId | 1 |
