Reactive Oxygen Species Formed by Secondary Organic Aerosols in Water and Surrogate Lung Fluid

Environmental Science & Technology
Haijie TongManabu Shiraiwa

Abstract

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 env...Continue Reading

Citations

Jun 27, 2020·Reviews on Environmental Health·Huibin GuoSijing Huang
May 12, 2019·Environmental Science & Technology·Steven J CampbellMarkus Kalberer
Oct 28, 2019·Environmental Science & Technology·Pratiti Home ChowdhuryMichal Pardo
Nov 17, 2020·Environmental Science & Technology·Yue ZhangJincai Zhao
Dec 23, 2020·Environmental Science & Technology·Jinlai WeiManabu Shiraiwa
Sep 20, 2019·Environmental Science & Technology·Haijie TongMarkus Kalberer
Sep 29, 2019·Environmental Science & Technology·Ting FangManabu Shiraiwa
Aug 14, 2020·Environmental Science & Technology·Junting QiuShinichi Enami
Sep 1, 2021·Atmospheric Chemistry and Physics·Steven J CampbellMarkus Kalberer
Nov 11, 2021·Environmental Science & Technology·Xiaowei WuShixiang Gao

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