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- W4311376449 abstract "Previous laboratory and theoretical studies have demonstrated that gas-phase oxidation of aromatic hydrocarbons can produce highly oxidized organic molecules (HOMs) via autoxidation, yet our molecular-level understanding of aromatics-derived HOMs existing stably in the particulate phase in ambient air remains unclear. In this study, filter-based ambient fine particle samples were collected in the Pearl River Delta region in south China and particle-bound HOMs derived from gas-phase autoxidation of aromatic hydrocarbons were assessed by using a Fourier transform ion cyclotron resonance mass spectrometer. The results revealed that aromatics-derived HOMs that survived in fine particles were more diverse than those observed in the laboratory or predicted by theory. O6–7 class species were the most abundant species (75–90% signal intensity) among the aromatics-derived CHO-HOMs. The aromatics-derived CHON-HOM monomers accounted for 7–10% of all observed CHON species. The observed aromatics-derived CHO- and CHON-HOMs accounted for 1.7–5.1‰ and 0.2–0.6‰, respectively, of the total particulate organic aerosol mass. The semiquantified concentrations of aromatics-derived HOMs were comparable to those of aromatics-derived SOA estimated by the tracer method and increased significantly with relative humidity. The results suggest a substantial contribution of aromatics-derived HOMs in aromatics-derived SOA in an urban atmosphere, particularly during haze days with higher relative humidity." @default.
- W4311376449 created "2022-12-25" @default.
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- W4311376449 date "2022-12-02" @default.
- W4311376449 modified "2023-10-18" @default.
- W4311376449 title "Particle-Bound Highly Oxidized Organic Molecules Derived from Aromatic Hydrocarbons in an Urban Atmosphere" @default.
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- W4311376449 doi "https://doi.org/10.1021/acs.estlett.2c00841" @default.
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