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Elsner, M. ; Hofstetter, T.B.*

Current perspectives on the mechanisms of chlorohydrocarbon degradation in subsurface environments: Insight from kinetics, product formation, probe molecules, and isotope fractionation.

In: Aquatic Redox Chemistry. Washington, DC: American Chemical Society (ACS), 2011. 407-439 (ACS Symp. Series ; 1071)

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Open Access Green as soon as Postprint is submitted to ZB.

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Degradation of chlorinated organic contaminants by natural and engineered reductive dechlorination reactions can occur via numerous biotic and abiotic transformation pathways giving rise to either benign or more toxic products. To assess whether dechlorination processes may lead to significant detoxification (a) the thermodynamic feasibility of a reaction, (b) rates of transformation, and (c) product formation routes need to be understood. To this end, fundamental knowledge of chlorohydrocarbon (CHC) reaction mechanisms is essential. We review insight from reaction thermodynamics, structure-reactivity relationships, and applications of radical and carbene traps, as well as of synthetic probe molecules. We summarize the state-of-knowledge about intermediates and reductive dechlorination pathways of vicinal and geminal haloalkanes, as well as of chlorinated ethenes. Transformation conditions are identified under which problematic products may be avoided. In an outlook, we discuss the potential of stable carbon and chlorine isotope fractionation to identify initial transformation mechanisms, competing transformation pathways, and common branching points.

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Publication type Article: Edited volume or book chapter

Editors Tratnyek, P.G.* ; Grundl, T.J.* ; Haderlein, S.B.*

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Keywords no keywords

ISSN (print) / ISBN 0097-6156

ISBN 978-0-8412-2652-4

Book Volume Title Aquatic Redox Chemistry

Journal ACS Symposium Series

Quellenangaben Volume: 1071, Pages: 407-439

Publisher American Chemical Society (ACS)

Publishing Place Washington, DC

Non-patent literature Publications

Institute(s) Institute of Groundwater Ecology (IGOE)