Unambiguous identification of N-containing oxygenated organic molecules using a chemical-ionization Orbitrap (CI-Orbitrap) in an eastern Chinese megacity
نویسندگان
چکیده
Abstract. Oxygenated organic molecules (OOMs) are dominated by the N-containing species in polluted urban environments. As OOMs, especially those with more than one nitrogen atom, prevail high m/z (mass-to-charge) range (m/z> 350 Th), unambiguous identification of OOMs is highly desirable for understanding their formation processes, precursors and influencing factors. To achieve this, we applied an ultra-high-resolution chemical-ionization Orbitrap (CI-Orbitrap) a field campaign found that contain (1N-OOMs), two (2N-OOMs) three (3N-OOMs) atoms comprised 50 %, 26 % 4 respectively, total OOMs. More interestingly, fraction 2N-OOMs increased increase carbon number (nC) was ones derived from aliphatic (2N-OOMAli, 64.2 %), indicating importance multistep oxidation. Plausible were aliphatics aromatics (2N-OOMAro, 16 %) monoterpenes (2N-OOMMT, 15.4 %). The absolute concentrations greatly affected pollution level most cases. 2N-OOMAli abundant 2N-OOM, its even on day enhanced proportion nC >10. While 2N-OOMAro daytime photochemical production, nighttime NO3-initiated oxidation played comparable role to photochemistry 2N-OOMMT. highest oxygenation level, followed 2N-OOMMT 2N-OOMAli, which NOx concentrations. These results highlight significant factors environments, where various volatile compound (VOC) atmospheric oxidants present.
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ژورنال
عنوان ژورنال: Atmospheric Chemistry and Physics
سال: 2023
ISSN: ['1680-7316', '1680-7324']
DOI: https://doi.org/10.5194/acp-23-3233-2023