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KINETICS AND MECHANISM FOR THE REACTIONS OF HALOGENATED ORGANIC COMPOUNDS IN THE TROPOSPHERE

Objective

The objectives are to identify uncertainties regarding the potential environmental effects of the proposed substitutes of the current used CFCs, eg, hydrochlorofluorocarbons and hydrofluorocarbons.
The data obtained in this project have greatly contributed to demonstrate that the secondary degradation products of the halocarbons, especially the HCFCs, have a negligible effect on stratospheric ozone. The rate constant data provided for the primary reaction with OH have been used to determine the lifetimes of the halocarbons, which are key parameters in the calculation of the ozone depletion potential and greenhouse warming potential for these compounds.
The project is concerned with the kinetics and mechanisms of oxidation of chlorine and bromine containing compounds under atmospheric conditions. For an accurate assessment of the ozone depletion potential the degradative oxidation mechanisms of several alternative CFCs products will be investigated, with particular emphasis on the determination of tropospheric sinks for their degradation intermediates.

The rate constants will be determined for a number of these intermediates.

The following processes will be investigated:

reactions of hydroxylradicals with halogenated alkanes and aldehydes;
absorption cross sections and photolysis for halogenated carbonyl compounds;
mechanisms for the oxidation of halogenated alkanes.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

UNIVERSITY COLLEGE DUBLIN
Address
Belfield
4 Dublin
Ireland

Participants (8)

BERGISCHE UNIVERSITAET GESAMTHOCHSCHULE WUPPERTAL
Germany
Address
Gauss Strasse 20
42097 Wuppertal
Centre National de la Recherche Scientifique (CNRS)
France
Address
351 Cours De La Libération
33405 Talence
MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address
Johann Joachim-becher-weg 27
55020 Mainz
RISOE NATIONAL LABORATORY
Denmark
Address
Frederiksborgvej 399
Roskilde
THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD
United Kingdom
Address
University Offices, Wellington Square
Oxford
UNIVERSITAET HANNOVER
Germany
Address
Welfengarten 1 B
30167 Hannover
UNIVERSITE DE BORDEAUX I
France
Address
Cours De La Libération 351
33405 Talence
United Kingdom Atomic Energy Authority
United Kingdom
Address
353,Harwell
OX11 0RA Didcot - Oxfordshire