Description: Das Projekt "Carbon and Chorine Isotope Effect Study to Investigate Chlorinated Ethylene Dehalogenation Mechanisms" wird vom Umweltbundesamt gefördert und von Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt GmbH in der Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V., Institut für Grundwasserökologie durchgeführt. Chlorinated ethylenes are prevalent groundwater contaminants. Numerous studies have addressed the mechanism of their reductive dehalogenation during biodegradation and reaction with zero-valent iron. However, despite insight with purified enzymes and well-characterized chemical model systems, conclusive evidence has been missing that the same mechanisms do indeed prevail in real-world transformations. While dual kinetic isotope effect measurements can provide such lines of evidence, until now this approach has not been possible for chlorinated ethylenes because an adequate method for continuous flow compound specific chlorine isotope analysis has been missing. This study attempts to close this prevalent research gap by a combination of two complementary approaches. (1) A novel analytical method to measure isotope effects for carbon and chlorine. (2) A carefully chosen set of well-defined model reactants representing distinct dehalogenation mechanisms believed to be important in real-world systems. Isotope trends observed in biotic and abiotic environmental dehalogenation will be compared to these model reactions, and the respective mechanistic hypotheses will be confirmed or discarded. With this hypothesis-driven approach it is our goal to elucidate for the first timdehalogenation reactions.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Ethylen ? München ? Chlor ? Eisen ? Chlorverbindung ? Durchflussmessung ? Kohlenstoff ? Pflanzensamen ? Brunnen ? Enzym ? Hydrogeologie ? Schmutzstoff ? Wirkung ? Beifang ? Gelöster organischer Kohlenstoff ? Messung ? Biologischer Abbau ? Analyseverfahren ? Bestimmungsmethode ? Chemikalien ? Hydrochemie ? Isotop ? Limnologie ? Siedlungswasserwirtschaft ? Studie ? Umweltmodell ? Grundwasser ? Dehalogenierung ? Wirkung ? Forschungseinrichtung ? Umwelt ? Forschung ? Maßnahme ? Hydrologie ? Fluss [Bewegung] ? METHODE ? MISCHUNG ? NEU ? NULL ? Reaktionsmodell ? SPEZIFISCH ? STILLGELEGT ? CHLORIERT ? VERBINDUNG ? VERGLEICHEN ? WICHTIG ? Integrierte Wasser-Ressourcen Bewirtschaftung ? MECHANISMEN ?
Region: Bayern
Bounding box: 12.53381° .. 12.53381° x 47.795° .. 47.795°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2009-01-01 - 2024-11-29
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