The reactive oxidant potential of different types of aged atmospheric particles: An outdoor chamber study
| Autor: | Eli Rosen, Richard M. Kamens, Haofei Zhang, Weruka Rattanavaraha, Karun Pantong, Qianfeng Li |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Atmospheric Science Ozone Diesel exhaust Environmental engineering Exhaust gas respiratory system Diesel engine complex mixtures Diesel Exhaust Particulate Aerosol chemistry.chemical_compound Diesel fuel Hydrocarbon chemistry Environmental chemistry General Environmental Science |
| Zdroj: | Atmospheric Environment. 45:3848-3855 |
| ISSN: | 1352-2310 |
| DOI: | 10.1016/j.atmosenv.2011.04.002 |
| Popis: | The reactive oxygen species (ROS) potential of aged diesel exhaust particulate matter (PM) and other aged aerosol systems in the presence and absence of an urban hydrocarbon environment was assessed. Experiments were performed in a 274 m 3 dual outdoor Teflon film chamber. Filter samples were taken to assess the oxidant generation associated with PM by an optimized dithiothreitol (DTT) method. Diesel exhaust PM had a higher ROS response when it was in the presence of an urban hydrocarbon mixture and was associated with significant O 3 production. For all the aged dilute diesel systems, ROS expression increased by a factor of 2–4 over fresh diesel particles. Other particle systems were also investigated. A low ROS was observed in most of the nighttime experiments, including the nighttime aerosols from SO 2 with O 3 and SO 2 aged by itself. However, when all the systems were compared, aged diesel exhaust tended to express very high ROS potentials, with secondary organic aerosols from an α-pinene + toluene + an urban HC mixture giving the highest ROS response. |
| Databáze: | OpenAIRE |
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