Aqueous phase oligomerization of α,β-unsaturated carbonyls and acids investigated using ion mobility spectrometry coupled to mass spectrometry (IMS-MS)

摘要: Abstract One of the current essential issues to unravel our ability forecast future climate change and air quality, implies a better understanding natural processes leading secondary organic aerosol (SOA) formation, in particular formation fate oligomers. The difficulty characterizing macromolecules is discern between large oxygenated molecules from series oligomers containing repeated small monomers diverse structures. In present study, taking advantage previously established radical vinyl oligomerization methyl vinylketone (MVK) aqueous phase, where relatively simple up 14 were observed, we have investigated same reactivity on several other unsaturated water soluble compounds (UWSOCs) few mixtures these precursor compounds. technique used characterize formed was traveling wave ion mobility spectrometry coupled hybrid quadrupole - time flight mass spectrometer (IMS-MS) fitted with an electrospray source ultra-high performance liquid chromatography (UPLC). allows for additional separation, especially ions, long carbon chains. We shown efficiency IMS-mass detect derived MVK photooxidation phase. results then compared oligomers, ten individual biogenic UWSOCs. allowed distinguishing different arising precursors. It also clearly showed that bearing non-conjugated unsaturation did not provide oligomerization. Finally, it technique, applied conjugated precursors, exhibited precursors co-oligomerize, i.e. forming only one complex oligomer system are discussed terms atmospheric implications detection chamber and/or field samples.