With the aim of identifying biomass burning (BB) SOA formation pathways, we performed ageing experiments of BB primary emissions at the FORTH Atmospheric-Simulation-Chamber in Patras, Greece. Different biofuels were employed using the most common types in Greece: olive-tree logs and pellets (residuals of pine-wood). SOA formation was investigated under different conditions in term of oxidants (OH or NO3 radicals), photochemical conditions (illumination vs. dark), and relative humidity (up to 80%) in order to simulate both diurnal and nocturnal chemical ageing and assess the effects of humidity on SOA condensation and chemical transformation. The evolution of organic aerosol was monitored using a HR-ToF-AMS, while filter samples were collected for offline chemical characterization of the water-soluble organic fraction (WSOC) by means of proton-Nuclear Magnetic Resonance (H-NMR) spectroscopy. H-NMR spectra of fresh and aged samples showed considerable variability between experiments. High relative humidity demonstrated to strongly influence the chemical features of aged BBOA.
Ageing of biomass burning organic aerosol in the FORTH atmospheric simulation chamber: chemical characterization by H-NMR
MASIOL M;SQUIZZATO S;
2020-01-01
Abstract
With the aim of identifying biomass burning (BB) SOA formation pathways, we performed ageing experiments of BB primary emissions at the FORTH Atmospheric-Simulation-Chamber in Patras, Greece. Different biofuels were employed using the most common types in Greece: olive-tree logs and pellets (residuals of pine-wood). SOA formation was investigated under different conditions in term of oxidants (OH or NO3 radicals), photochemical conditions (illumination vs. dark), and relative humidity (up to 80%) in order to simulate both diurnal and nocturnal chemical ageing and assess the effects of humidity on SOA condensation and chemical transformation. The evolution of organic aerosol was monitored using a HR-ToF-AMS, while filter samples were collected for offline chemical characterization of the water-soluble organic fraction (WSOC) by means of proton-Nuclear Magnetic Resonance (H-NMR) spectroscopy. H-NMR spectra of fresh and aged samples showed considerable variability between experiments. High relative humidity demonstrated to strongly influence the chemical features of aged BBOA.File | Dimensione | Formato | |
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