Particle growth induced by photosensitized reactions
| Autor: | Gemayel, R., Tomaz, S., Perrier, S., Dubois, C., George, C., Dumas, S. |
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| Přispěvatelé: | IRCELYON-Catalytic and Atmospheric Reactivity for the Environment (CARE), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRCELYON, ProductionsScientifiques |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | EUROPEAN AEROSOL CONFERENCE-EAC 2019 EUROPEAN AEROSOL CONFERENCE-EAC 2019, Aug 2019, gothenburg, Sweden |
| Popis: | SSCI-VIDE+CARE+RGM:STO:SPR:CUB:CGO:SDU; International audience; Secondary organic aerosols (SOA) play an important role in air quality. Despite the important number of studies on the formation and aging of SOA, this field remains poorly characterized. Traditionally, particle growth is attributed to the condensation of low vapor pressure species produced by atmospheric oxidation of volatile organic compounds (VOCs). Recent studies have shown that the presence of a photosensitizer in the aerosol leads to the formation of SOA and mechanisms for aerosol growth based on photosensitized reaction were proposed (Monge et al., 2012; Aregahegn et al., 2013 and Rossignol et al., 2014). Heterogeneous reactions activated by light can lead to SOA formation by VOCs uptake at the surface of particles when only traces of photosensitizers are present.Acetophenone and xanthone are two photosensitizers present abundantly in the ambient aerosol. In this study, we tested their ability to participate to particle growth by photosensitized reaction in presence of a VOC (furfural).Experiments were performed with a 5.5 L horizontal aerosol flow reactor where particles of ammonium sulfate containing traces of photosensitizers are injected. The particles size is selected with a DMA on the entrance of the flow reactor. The granulometry and the gas-phase are measured at the exit of the reactor using a SMPS and a PTR-MS, respectively. The particle growth is studied in varying experimental conditions. Figure 1 shows the growth of particles containing acetophenone in the presence of light and 200 ppb of furfural.In this study we found that SOA growth from ammonium sulfate seeds containing photosensitizer (acetophenone…) was dependent on irradiation wavelength, irradiation time, humidity, and temperature. |
| Databáze: | OpenAIRE |
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