Guaiacol Nitration in a Simulated Atmospheric Aerosol with an Emphasis on Atmospheric Nitrophenol Formation Mechanisms
| Autor: | Hartmut Herrmann, Ivana Drventić, Olaf Böge, Janine Anders, Jörg Kleffmann, Anke Mutzel, Ana Kroflič, Peter Mettke |
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| Rok vydání: | 2021 |
| Předmět: |
Atmospheric Science
nitrophenol formation 010504 meteorology & atmospheric sciences 010501 environmental sciences 01 natural sciences Article chemistry.chemical_compound Nitrophenol Geochemistry and Petrology Nitration aqueous-phase nitration Relative humidity dark nitration 0105 earth and related environmental sciences guaiacol Catechol HONO carbon loss catechol Particulates Aerosol aerosol chamber chemistry 13. Climate action Space and Planetary Science Yield (chemistry) Environmental chemistry Guaiacol |
| Zdroj: | ACS Earth & Space Chemistry ACS Earth and Space Chemistry |
| ISSN: | 2472-3452 |
| Popis: | Atmospheric nitrophenols are pollutants of concern due to their toxicity and light-absorption characteristics and their low reactivity resulting in relatively long residence times in the environment. We investigate multiphase nitrophenol formation from guaiacol in a simulated atmospheric aerosol and support observations with the corresponding chemical mechanisms. The maximal secondary organic aerosol (SOA) yield (42%) is obtained under illumination at 80% relative humidity. Among the identified nitrophenols, 4-nitrocatechol (3.6% yield) is the prevailing species in the particulate phase. The results point to the role of water in catechol and further 4-nitrocatechol formation from guaiacol. In addition, a new pathway of dark nitrophenol formation is suggested, which prevailed in dry air and roughly yielded 1% nitroguaiacols. Furthermore, the proposed mechanism possibly leads to oligomer formation via a phenoxy radical formation by oxidation with HONO. |
| Databáze: | OpenAIRE |
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