Significant secondary organic aerosol production from aqueous-phase processing of two intermediate volatility organic compounds
| Autor: | Yang Ou, Yanfang Chen, Junchen Lu, Zhaolian Ye, Xinchun Xie, Mindong Chen, Xinlei Ge, Yu Liu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Atmospheric Science
Aqueous solution 010504 meteorology & atmospheric sciences Chemistry Aqueous two-phase system 010501 environmental sciences Phenanthrene Chromophore Photochemistry behavioral disciplines and activities 01 natural sciences Naphthoquinone Aerosol chemistry.chemical_compound Hydroxyl radical Volatility (chemistry) 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Atmospheric Environment. 211:63-68 |
| ISSN: | 1352-2310 |
| Popis: | Intermediate volatility organic compounds (IVOCs) recently have been identified as an important group of air pollutants, and they can contribute significantly to the secondary organic aerosol (SOA) formation via gas-phase reactions. However, significance of the SOA from aqueous oxidation of IVOCs was largely unknown. Here, we investigated the aqueous aging of two model IVOCs of naphthoquinone (NAQ) and phenanthrene (PHE) at a staring concentration of 10 μM. Both species were found to have high SOA yields (∼50%) against hydroxyl radical photochemical oxidation. PHE can be slowly oxidized under dark conditions (∼10% in 8 h) while NAQ cannot, but it can photo-degrade itself under simulated sunlight at a high rate (∼56% in 1 h). A group of oxygenated products were formed and its concentrations increased continuously throughout hydroxyl radical-mediated aging of both precursors. Aqueous aging led to enhancements of light absorption, especially for NAQ, and the oxygenated products were likely light chromophores. Our findings highlight the possible significance of SOA from aqueous oxidation of IVOCs. Future investigations on a broad spectrum of IVOCs and inclusion of such SOA formation pathway into climate and air quality models should be considered. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect