Publications by authors named "Tommaso Galeazzo"
The chemical composition and physical properties of secondary organic aerosol (SOA) generated through OH-initiated oxidation of mixtures containing β-myrcene, an acyclic monoterpene, and d-limonene, a cyclic monoterpene, were investigated to assess the extent of the chemical interactions between their oxidation products. The SOA samples were prepared in an environmental smog chamber, and their composition was analyzed offline using ultraperformance liquid chromatography coupled with electrospray ionization high-resolution mass spectrometry (UPLC-ESI-HRMS). Our results suggested that SOA containing β-myrcene showed a higher proportion of oligomeric compounds with low volatility compared to that of SOA from d-limonene.
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- The study explores how nitrogen oxides (NO) affect the formation of reactive oxygen species (ROS) and environmentally persistent free radicals (EPFR) during the photooxidation of α-pinene and naphthalene, which are important for understanding aerosol chemistry and health effects.
- It was found that while naphthalene SOA contains low levels of EPFR, NO has minimal impact on EPFR concentrations and oxidative potential, with ROS generation greatly reduced under high NO conditions.
- High-resolution mass spectrometry revealed that high NO levels lead to the formation of nitroaromatics and organic nitrates, and modeling showed that peroxy radicals react with NO instead of hydroxyl radicals, resulting in decreased hydroperoxide formation and