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1994
Conference Paper
Titel
Atmospheric oxidation processes of aromatics studied within lactoz and step
Abstract
The achievements on the oxidation processes of aromatics in European research projects in the framework of the EUROTRAC-subproject LACTOZ and the CEC-programme STEP are reviewed. A brief overview on the competition among OH and NO3 in the primary initiation is given. Addition is a main process with both radicals. The higher stability of the OH-adducts favours oxidation by further attack on the ring, whereas NO3 favours side-chain attack, the NO3-adducts being fairly unstaable. The progress on the identification of Primary (and in the case of side chain attack of OH secondary) intermediates and secondary reactions of OH-adduct and benzyl-type radicals with the tropospheric scavengers O2, NO2 and NO is reported. There is now agreement in that O2 acts as an efficient scavenger of the OH-adducts, overriding the unimolecular decay. NO2 may have a contribution only under extremely polluted conditions, and NO is found to be extremely inefficient (abstract truncated)