Formation of Light Absorbing Organo-Nitrogen Species from Evaporation of Droplets Containing Glyoxal and Ammonium Sulfate

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• 作者：Alex K. Y. Lee ; Ran Zhao ; Richard Li ; John Liggio ; Shao-Meng Li ; Jonathan. P. D. Abbatt
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：November 19, 2013
• 年：2013
• 卷：47
• 期：22
• 页码：12819-12826
• 全文大小：418K
• 年卷期：v.47,no.22(November 19, 2013)
• ISSN：1520-5851

文摘

In the atmosphere, volatile organic compounds such as glyoxal can partition into aqueous droplets containing significant levels of inorganic salts. Upon droplet evaporation, both the organics and inorganic ions become highly concentrated, accelerating reactions between them. To demonstrate this process, we investigated the formation of organo-nitrogen and light absorbing materials in evaporating droplets containing glyoxal and different ammonium salts including (NH₄)₂SO₄, NH₄NO₃, and NH₄Cl. Our results demonstrate that evaporating glyoxal-(NH₄)₂SO₄ droplets produce light absorbing species on a time scale of seconds, which is orders of magnitude faster than observed in bulk solutions. Using aerosol mass spectrometry, we show that particle-phase organics with high N:C ratios were formed when ammonium salts were used, and that the presence of sulfate ions promoted this chemistry. Since sulfate can also significantly enhance the Henry鈥檚 law partitioning of glyoxal, our results highlight the atmospheric importance of such inorganic鈥搊rganic interactions in aqueous phase aerosol chemistry.