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Accueil du site > Thèmes de recherche > Atmosphère & environnement > 2.1. Dégradation des Composés Organiques Volatils et semi-volatils et formation d’aérosols secondaires

2.1. Dégradation des Composés Organiques Volatils et semi-volatils et formation d’aérosols secondaires

2.1.1 Atmospheric degradation of Volatile organic Compounds (VOCs)

The degradation of Volatile Organic Compounds (VOCs) in the troposphere leads to the production of a range of secondary pollutants such as ozone, peroxyacyl nitrate, secondary organic aerosols and other components of the photochemical smog in urban areas. VOCs are emitted directly into the atmosphere from biogenic and anthropogenic sources. The main gas phase removal process of most VOCs is the reaction with OH radical, the oxidation by O3 and NO3 being other important degradation pathways (...)

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2.1.2 Composés semi volatils (pesticides)

The wide use of pesticides in agricultural applications is of some concern since they may have a significant environmental impact. Once a pesticide is applied in the field, it can be partitioned into the soil, water and atmosphere. Knowledge of the environmental fate of pesticides is important in order to assess the potential risks to human and animal health. The atmospheric fate in the gas phase of a series of pesticides (chloropicrine, hymexazol …) has been investigated using the large (...)

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2.1.3 Formation des aérosols organiques secondaires

The gas phase ozonolysis of a series of unsaturated biogenic or anthropogenic organic compounds (such as myrcene, linalool, ocimene, α-farnesene, unsaturated alcohols, unsaturated ethers…) has been investigated. The reaction rate coefficients have been determined which enabled to calculate the tropospheric lifetimes of these species. Most of the studied compounds have been found to be very short lived towards the reaction with ozone (less than 2 hours). The SOA formation yields were found to (...)

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