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| Titel |
On the atmospheric degradation of multifunctional organic compounds by NO3 and SO4- radicals in aqueous solution |
| VerfasserIn |
Luisa Schöne, Bastian Stieger, Christian Weller, Hartmut Herrmann |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089206
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| Publikation (Nr.) |
 EGU/EGU2014-3402.pdf |
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| Zusammenfassung |
| The atmospheric decomposition and transformation of a large number of organic compounds
is initiated by radicals in the gas and aqueous phase. With increasing degree of oxidation and
functionalization, organics become less volatile and more water soluble and partition into
aqueous particles and cloud droplets where the oxidation by radicals continues. NO3
and SO4- radicals dominate the atmospheric aqueous phase besides OH radicals.
Within this work, temperature dependent kinetic investigations were conducted
by use of a laser flash photolysislaser long path absorption (LFPLLPA) setup.
Second order rate constants for the reactions of 3-methoxy-1-propanol, diethylether,
methylpropylether, 2-methyloxirane-2-carbaldehyde, 2,3-dihydroxy-2-methylpropanal,
pyruvic, glyoxylic and glycolic acid as well as glyoxal, methylglyoxal and glycolaldehyde
with NO3 and SO4- radicals were measured in a temperature range of 278 and 318K
applying pseudo-first order kinetics. The reactivity of the acids and their anions were
investigated separately adjusting the pH to pH1 or pH8 for the acid or the anion
form, respectively. From these measurements, activation parameters were derived.
Measured k2nd range from 106-108M1s1. The kinetic and thermodynamic
parameters as well as reaction mechanisms will be discussed within this contribution. |
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