Reactive oxygen species formed in aqueous mixtures of secondary organic aerosols and mineral dust influencing cloud chemistry and public health in the Anthropocene
| Autor: | Christopher J. Kampf, Ulrich Pöschl, Haijie Tong, Joanna Socorro, Pascale S. J. Lakey, William H. Brune, Thomas Berkemeier, Andrea M. Arangio, Manabu Shiraiwa |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Radical Inorganic chemistry 010501 environmental sciences Mineral dust behavioral disciplines and activities 01 natural sciences chemistry.chemical_compound Kaolinite Physical and Theoretical Chemistry Isoprene 0105 earth and related environmental sciences Aerosols Air Pollutants Minerals Aqueous solution Atmosphere Water Particulates Decomposition Deposition (aerosol physics) chemistry Environmental chemistry Particulate Matter Public Health Reactive Oxygen Species |
| Zdroj: | Faraday Discussions. 200:251-270 |
| ISSN: | 1364-5498 1359-6640 |
| DOI: | 10.1039/c7fd00023e |
| Popis: | Mineral dust and secondary organic aerosols (SOA) account for a major fraction of atmospheric particulate matter, affecting climate, air quality and public health. How mineral dust interacts with SOA to influence cloud chemistry and public health, however, is not well understood. Here, we investigated the formation of reactive oxygen species (ROS), which are key species of atmospheric and physiological chemistry, in aqueous mixtures of SOA and mineral dust by applying electron paramagnetic resonance (EPR) spectrometry in combination with a spin-trapping technique, liquid chromatography-tandem mass spectrometry (LC-MS/MS), and a kinetic model. We found that substantial amounts of ROS including OH, superoxide as well as carbon- and oxygen-centred organic radicals can be formed in aqueous mixtures of isoprene, α-pinene, naphthalene SOA and various kinds of mineral dust (ripidolite, montmorillonite, kaolinite, palygorskite, and Saharan dust). The molar yields of total radicals were ∼0.02–0.5% at 295 K, which showed higher values at 310 K, upon 254 nm UV exposure, and under low pH (2O2 with Fe2+ and that SOA can be the main source of OH radicals in aqueous droplets at low concentrations of H2O2 and Fe2+. In the human respiratory tract, the inhalation and deposition of SOA and mineral dust can also lead to the release of ROS, which may contribute to oxidative stress and play an important role in the adverse health effects of atmospheric aerosols in the Anthropocene. |
| Databáze: | OpenAIRE |
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