Enantiomeric composition of 2-methyltetrols in atmospheric aerosol from boreal forest environment in Hyytiälä, Finland
(English)Manuscript (preprint) (Other academic)
Ambient aerosol samples collected in a boreal forest environment in Hyytiälä, Finland were analyzed for the presence of (2R,3S)- and (2S,3R)- methylerythritol and (2S,3S)- and (2R,3R)- methylthreitol. These four stereoisomers can have primary and secondary origins from the biosynthesis and oxidation processes of isoprene in plants and in the atmosphere. Only 2-methylerythritols were detected in the aerosol samples collected between June 2009 and January 2010. Average observed concentrations were 3.16 and 2.83 ng m-3 for (2R,3S)- and (2S,3R)- methylerythritol, respectively. The enantiomer fractions for (2R,3S)- and (2S,3R)- methylerythritol (Ef) were on average 0.53:0.47. The concentrations of these isoprene oxidation products of primary origin ranged between 0.8 and 53.8 ng m-3 for the 2-methylerythritols. The primary origin contribution was up to 100% of the total mass of the 2-methylerythritols in some of these samples. The present study reinforces the importance of the analysis of chiral organic compounds to correctly assess the relative contribution of primary biogenic emissions and atmospheric isoprene oxidation products to biogenic secondary organic aerosol.
isoprene, 2-methyltetrols, chiral GC-MS, enantiomeric composition
Research subject Atmospheric Sciences
IdentifiersURN: urn:nbn:se:su:diva-89300OAI: oai:DiVA.org:su-89300DiVA: diva2:616950