Reactive Oxygen Species Formed by Secondary Organic Aerosols in Water and Surrogate Lung Fluid
| Autor: | Ulrich Pöschl, Fangxia Shen, William H. Brune, Pascale S. J. Lakey, Manabu Shiraiwa, Haijie Tong, Joanna Socorro, Andrea M. Arangio, Kurt Lucas |
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| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Radical chemistry.chemical_element 010501 environmental sciences medicine.disease_cause behavioral disciplines and activities 01 natural sciences Oxygen Redox Peroxide chemistry.chemical_compound medicine Environmental Chemistry Hydrogen peroxide Isoprene 0105 earth and related environmental sciences Aerosols chemistry.chemical_classification Air Pollutants Reactive oxygen species Water Hydrogen Peroxide General Chemistry chemistry Environmental chemistry Reactive Oxygen Species Oxidative stress |
| Zdroj: | Environmental Science & Technology. |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.8b03695 |
| Popis: | Reactive oxygen species (ROS) play a central role in adverse health effects of air pollutants. Respiratory deposition of fine air particulate matter can lead to the formation of ROS in epithelial lining fluid, potentially causing oxidative stress and inflammation. Secondary organic aerosols (SOA) account for a large fraction of fine particulate matter, but their role in adverse health effects is unclear. Here, we quantify and compare the ROS yields and oxidative potential of isoprene, β-pinene, and naphthalene SOA in water and surrogate lung fluid (SLF). In pure water, isoprene and β-pinene SOA were found to produce mainly OH and organic radicals, whereas naphthalene SOA produced mainly H2O2 and O2•-. The total molar yields of ROS of isoprene and β-pinene SOA were 11.8% and 8.2% in water and decreased to 8.5% and 5.2% in SLF, which can be attributed to ROS removal by lung antioxidants. A positive correlation between the total peroxide concentration and ROS yield suggests that organic (hydro)peroxides may play an important role in ROS formation from biogenic SOA. The total molar ROS yields of naphthalene SOA was 1.7% in water and increased to 11.3% in SLF. This strong increase is likely due to redox reaction cycles involving environmentally persistent free radicals (EPFR) or semiquinones, antioxidants, and oxygen, which may promote the formation of H2O2 and the adverse health effects of anthropogenic SOA from aromatic precursors. |
| Databáze: | OpenAIRE |
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