Kinetics of Speciation Reactions among Glyoxal and Methylglyoxal Hydrates and Polymers upon Dilution: Implications for Cloud Processing of Aerosols
Abstract
As aerosols are coated with water during cloud formation, their organic fraction may undergo reactions such as hydration, hydrolysis and/or polymerization due to the rapid changes in water content and acidity. Here, we examine the kinetics of these speciation reactions for methylglyoxal and glyoxal upon dilution from aerosol to cloud droplet concentrations. Electrospray ionization mass spectrometry is used to measure monomer hydrates and various dimers and trimers as a function of time since dilution. Complex speciation kinetics are observed; for example, upon dilution, dimer concentrations initially increase rapidly followed by a slow decrease while some trimer concentrations increase and others decrease.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.A43D0182K
- Keywords:
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- 0305 ATMOSPHERIC COMPOSITION AND STRUCTURE / Aerosols and particles;
- 0317 ATMOSPHERIC COMPOSITION AND STRUCTURE / Chemical kinetic and photochemical properties;
- 0320 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud physics and chemistry;
- 0365 ATMOSPHERIC COMPOSITION AND STRUCTURE / Troposphere: composition and chemistry