Glyoxal aqueous chemistry

Fig. 5. 33 Scheme of Cj aqueous-phase chemistry. (HCO)2 - glyoxal, (COOH)2 oxalic add dotted line - multistep process. 

Finally, the CH2OH radicals react with O2 to give HCHO and HO2 (5.327). Thus, C2 is broken down into Ci species. Fig. 5.34 shows schematically the C2 gas phase chemistry. It is obvious that there is no ethanol formation and acetic acid decomposition, whereas acetaldehyde provides many pathways back to Ci chemistry. Glycolaldehyde is a highly water-soluble product from several C2 species (ethene, acetaldehyde and ethanol) other bicarbonyls, however, are likely to be produced preferably in solution. The aqueous phase produces other C2 speeies but also deeomposes them (Fig. 5.35). By contrast, in aqueous solution from Ci, C2 species can be given as shown by the formation of glyoxal from the formyl radicals (5.351) the latter is... 

Ervens B, Volkamer R (2010) Glyoxal processing by aerosol multiphase chemistry towards a kinetic modeling framework of secondary organic aerosol formation in aqueous particles. Atmos Chem Phys 10(17) 8219-8244... 

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