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Volatility and Yield of Glycolaldehyde SOA Formed through Aqueous Photochemistry and Droplet Evaporation.

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Title: Volatility and Yield of Glycolaldehyde SOA Formed through Aqueous Photochemistry and Droplet Evaporation.
Authors: Ortiz-Montalvo, Diana L.1, Lim, Yong B.1, Perri, Mark J.2, Seitzinger, Sybil P.3, Turpin, Barbara J.1 turpin@envsci.rutgers.edu
Source: Aerosol Science & Technology. Sep2012, Vol. 46 Issue 9, p1002-1014. 13p.
Subjects: Glycolaldehyde, Evaporation (Chemistry), Photochemistry, Hydroxyl group, Oxidation, Aerosols, Vapor pressure, Enthalpy
Abstract: Aqueous hydroxyl radical (∼10−12 M) oxidation of glycolaldehyde (1 mM), followed by droplet evaporation, forms secondary organic aerosol (SOA) that exhibits an effective liquid vapor pressure and enthalpy of vaporization of ∼10−7 atm and ∼70 kJ/mol, respectively, similar to the mix of organic acids identified in reaction samples. Salts of these acids have vapor pressures about three orders of magnitude lower (e.g., ammonium succinate ∼10−11 atm), suggesting that the gas–particle partitioning behavior of glycolaldehyde SOA depends strongly on whether products are present in the atmosphere as acids or salts. Several reaction samples were used to simulate cloud droplet evaporation using a vibrating orifice aerosol generator. Samples were also analyzed by ion chromatography (IC), electrospray ionization mass spectrometry (ESI-MS), IC-ESI-MS, and for total carbon. Glycolaldehyde SOA mass yields were 50–120%, somewhat higher than yields reported previously (40–60%). Possible reasons are discussed: (1) formation of oligomers from droplet evaporation, (2) inclusion of unquantified products formed by aqueous photooxidation, (3) differences in gas–particle partitioning, and (4) water retention in dried particles. These and similar results help to explain the enrichment of organic acids in particulate organic matter above clouds compared with those found below clouds, as observed previously in aircraft campaigns. Copyright 2012 American Association for Aerosol Research [ABSTRACT FROM PUBLISHER]
Copyright of Aerosol Science & Technology is the property of Taylor & Francis Ltd 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.)
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DbLabel: Engineering Source
An: 76273998
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PubType: Academic Journal
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  Data: Volatility and Yield of Glycolaldehyde SOA Formed through Aqueous Photochemistry and Droplet Evaporation.
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  Data: <searchLink fieldCode="AR" term="%22Ortiz-Montalvo%2C+Diana+L%2E%22">Ortiz-Montalvo, Diana L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lim%2C+Yong+B%2E%22">Lim, Yong B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Perri%2C+Mark+J%2E%22">Perri, Mark J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Seitzinger%2C+Sybil+P%2E%22">Seitzinger, Sybil P.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Turpin%2C+Barbara+J%2E%22">Turpin, Barbara J.</searchLink><relatesTo>1</relatesTo><i> turpin@envsci.rutgers.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Aerosol+Science+%26+Technology%22">Aerosol Science & Technology</searchLink>. Sep2012, Vol. 46 Issue 9, p1002-1014. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Glycolaldehyde%22">Glycolaldehyde</searchLink><br /><searchLink fieldCode="DE" term="%22Evaporation+%28Chemistry%29%22">Evaporation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Photochemistry%22">Photochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Hydroxyl+group%22">Hydroxyl group</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Vapor+pressure%22">Vapor pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Enthalpy%22">Enthalpy</searchLink>
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  Data: Aqueous hydroxyl radical (∼10−12 M) oxidation of glycolaldehyde (1 mM), followed by droplet evaporation, forms secondary organic aerosol (SOA) that exhibits an effective liquid vapor pressure and enthalpy of vaporization of ∼10−7 atm and ∼70 kJ/mol, respectively, similar to the mix of organic acids identified in reaction samples. Salts of these acids have vapor pressures about three orders of magnitude lower (e.g., ammonium succinate ∼10−11 atm), suggesting that the gas–particle partitioning behavior of glycolaldehyde SOA depends strongly on whether products are present in the atmosphere as acids or salts. Several reaction samples were used to simulate cloud droplet evaporation using a vibrating orifice aerosol generator. Samples were also analyzed by ion chromatography (IC), electrospray ionization mass spectrometry (ESI-MS), IC-ESI-MS, and for total carbon. Glycolaldehyde SOA mass yields were 50–120%, somewhat higher than yields reported previously (40–60%). Possible reasons are discussed: (1) formation of oligomers from droplet evaporation, (2) inclusion of unquantified products formed by aqueous photooxidation, (3) differences in gas–particle partitioning, and (4) water retention in dried particles. These and similar results help to explain the enrichment of organic acids in particulate organic matter above clouds compared with those found below clouds, as observed previously in aircraft campaigns. Copyright 2012 American Association for Aerosol Research [ABSTRACT FROM PUBLISHER]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Aerosol Science & Technology is the property of Taylor & Francis Ltd 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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        Value: 10.1080/02786826.2012.686676
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        Text: English
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        Type: general
      – SubjectFull: Evaporation (Chemistry)
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      – SubjectFull: Photochemistry
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      – SubjectFull: Hydroxyl group
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      – SubjectFull: Oxidation
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      – SubjectFull: Aerosols
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      – SubjectFull: Vapor pressure
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      – SubjectFull: Enthalpy
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      – TitleFull: Volatility and Yield of Glycolaldehyde SOA Formed through Aqueous Photochemistry and Droplet Evaporation.
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              Text: Sep2012
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