Description: Das Projekt "RINOXA-2 'Entfernung und Interkonversion von Oxidantien in der atmosphaerischen waessrigen Loesung', Akronym: RINOXA" wird vom Umweltbundesamt gefördert und von Universität-Gesamthochschule Essen, Fachbereich 8 Chemie, Institut für Physikalische und Theoretische Chemie durchgeführt. 'Laser-based kinetic and spectroscopic studies of SOdeep4high--, NOdeep3- and CIdeep2high--reactions with key organic troposheric constituents and the resulting intermediates in aqueous solution.' The projekt is devoted to laboratory studies of aqueous phase interconversions of oxidants (OH, HOdeep2, Odeep3, SOdeep4high-, NO3, CIdeep2high-) 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 oxidizing capacity of the troposphere by (i) phase transfer of organic compounds from the gas phase and (ii) aqueous phase reactions of primary and secondary oxidants. The following organic key substance groups (KSG 1-5) have been chosen: (i) KSG 1: Oxidation products of sulfur-containing organics, (ii) KSG 2: Aldehyds and their condensation products with S (IV), (iii) KSG 3: Substituted aromatics, (iv) KSG 4: Isoprene and terpenes and (v) KSG 5: Products from isoprene/terpene degradation. The objectives of this project are: (i) To quantify the reaction kinetics of strongly oxidizing radicals such as OH, HOdeep2, Odeep3, NOdeep3, SOdeep4high- and CIhigh- 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. (ii) 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. (iii) To determine accomodation and uptake coefficients of important gas phase organic species for each of the key substance groups. (iv) 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.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Tierhaltungsanlage ? Ozon ? Terpene ? Nitrat ? Laser ? Blitz ? Laserspektroskopie ? Oxidationsmittel ? Isopren ? Absorption ? Aldehyd ? Photolyse ? Organische Verbindung ? Gasförmiger Stoff ? Abbauprodukt ? Daten ? Kondensation ? Messverfahren ? Oxidation ? Studie ? Troposphäre ? Stoff ? Atmosphärenchemie ? Reaktionskinetik ? Interconversions ? Radicals ? Radikal [Chemie] ? Waessrige Loesung ? Aqueous-solution ? Key-Organic-Tropospheric-Constituents ? Kinetic-and-Spectroscopic-Studies ? Kondensationsprodukt ? Phasenuebergang ?
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: 1996-04-01 - 1999-03-31
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