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Atmospheric oxidation processes of aromatics studied within lactoz and step

: Zetzsch, C.

Restelli, G.; Angeletti, G.:
Physico-chemical behaviour of atmospheric pollutants. Proceedings of the 6th European Symposium. Vol.1
Luxembourg: Office for Official Publications of the European Communities, 1994 (Air pollution research report)
ISBN: 92-826-4120-1
European Symposium on Physico-Chemical Behaviour of Atmospheric Pollutants <6, 1993, Varese>
Fraunhofer ITA ( ITEM) ()
air pollution; aromatic compound; atmospheric chemistry; oxidation; photochemistry; physical chemistry; pollutant; theoretical chemistry

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)