Cel
To investigate through laboratory studies the aqueous phase
interconversions of oxidants (OH, HO2, O3, SO4-, NO3-, Cl2-) with key organic compounds which are transferred from the gas phase into the tropospheric aqueous phase.
The processes to be studied are expected to influence the
oxidising capacity of the troposphere by (1) phase transfer of organic compounds from the gas phase and (2) aqueous phase
reactions of primary and secondary oxidants.
The following organic key substance groups (KSG 1-5) have been chosen: (1) KSG 1: oxidation products of sulphur containing organics, (2) KSG 2: aldehydes and their condensation products with S(IV), (3) KSG 3: substituted aromatics, (4) KSG 4:
isoprene and terpenes and (5) KSG 5: products from
isoprene/terpene degradation. The tasks of this project are:
1. To quantify the reaction kinetics of strongly oxidising
radicals such as OH, HO2, O3, NO3, SO4- and Cl2- with the
key organic substances listed above with complementary
techniques (pulse radiolysis/time resolved UV-absorption
and laser flash photolysis / time resolved Vis aborption)
to study the influence of TMI (FE, MN) in ozone reactions
additionally.
2. To identify intermediates which are formed in aqueous phase free radical reactions by the complementary techniques of
time resolved laser photolysis/long path diode array
absorption spectroscopy and time-resolved electron spin
resonance.
3. To determine accommodation and uptake coefficients of
important gasphase organic species for each of the key
substance groups.
4. To perform product studies in steady-state photolysis
experiments in order to identify the most important stable
degradation products for the most important constituents of
each group as listed earlier.
The project is expected to provide a number of rate data
concerning phase transfer and reactivity. The use of these data as input-parameters in advanced tropospheric multiphase models is expected to significantly improve our understanding of the complex tropospheric chemistry system.
Dziedzina nauki
- natural scienceschemical sciencesorganic chemistryaldehydes
- natural sciencesphysical sciencesopticsspectroscopyabsorption spectroscopy
- natural sciencesearth and related environmental sciencesatmospheric sciencesmeteorologytroposphere
- natural scienceschemical sciencesnuclear chemistryradiation chemistry
- natural sciencesphysical sciencesopticslaser physics
Zaproszenie do składania wniosków
Data not availableSystem finansowania
CSC - Cost-sharing contractsKoordynator
45117 ESSEN
Niemcy