Description: Das Projekt "Entfernung und Interkonversionen von Oxidantien in der atmosphaerisch-waessrigen Phase, Teil 2" wird vom Umweltbundesamt gefördert und von Universität-Gesamthochschule Essen, Fachbereich 8 Chemie, Institut für Physikalische und Theoretische Chemie durchgeführt. The processes to be studied are expected to influence the oxidizing 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 oxidizing radicals such as OH, HO2, O3, NO3, SO4- and C12- with the key organic substances listed above with complementary techniques (pulse radiolysis/time resolved UV-absorption and laser flash photolysis/time resolved Vis absorption) 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 listet 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.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Ozon ? Tierhaltungsanlage ? Terpene ? Nitrat ? Blitz ? Laser ? Laserspektroskopie ? Oxidationsmittel ? Schwefel ? Isopren ? Absorption ? Aldehyd ? Photolyse ? Organische Verbindung ? Gasförmiger Stoff ? Abbauprodukt ? Analyseverfahren ? Daten ? Kondensation ? Oxidation ? Studie ? Troposphäre ? Zwischenprodukt ? Stoff ? Chemische Reaktion ? Reaktionskinetik ? Laboruntersuchung ? Analytik ? Radikal [Chemie] ? Waessrige-Phase ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1996-02-01 - 1998-03-31
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