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Carbon stable isotope (13C) fractionation in chlorofluorocarbon (CFC) compounds arising from abiotic (chemical) degradation using zero-valent iron (ZVI) and biotic (landfill gas attenuation) processes is investigated. Batch tests (at 25°C) for CFC-113 and CFC-11 using ZVI show quantitative degradation of CFC-113 to HCFC-123a and CFC-1113 following pseudo-first-order kinetics corresponding to a half-life (τ1/2) of 20.5 h, and a ZVI surface-area normalized rate constant (kSA) of -(9.8 ± 0.5) × 10-5 L m-2 h-1. CFC-11 degraded to trace HCFC-21 and HCFC-31 following pseudo-first-order kinetics corresponding to τ1/2 = 17.3 h and kSA = -(1.2 ± 0.5) × 10-4 L m-2 h-1. Significant kinetic isotope effects of ε(‰) = -5.0 ± 0.3 (CFC-113) and -17.8 ± 4.8 (CFC-11) were observed. Compound-specific carbon isotope analyses also have been used here to characterize source signatures of CFC gases (HCFC-22, CFC-12, HFC-134a, HCFC-142b, CFC-114, CFC-11, CFC-113) for urban (UAA), rural/remote (RAA), and landfill (LAA) ambient air samples, as well as in situ surface flux chamber (FLUX; NO FLUX) and landfill gas (LFG) samples at the Dargan Road site, Northern Ireland. The latter values reflect biotic degradation and isotopic fractionation in LFG production, and local atmospheric impact of landfill emissions through the cover. Isotopic fractionations of Δ33C ~ -13‰ (HCFC-22), Δ13C ~ -35‰ (CFC-12) and Δ13C ~ -15‰ (CFC-11) were observed for LFG in comparison to characteristic solvent source signatures, with the magnitude of the isotopic effect for CFC-11 apparently similar to the kinetic isotope effect for (abiotic) ZVI degradation.

Titel:	Carbon Isotopic Fractionation of CFCs during Abiotic and Biotic Degradation
Autor/in / Beteiligte Person:	ARCHBOLD, Marie E ; ELLIOT, Trevor ; KALIN, Robert M
Link:	E-Journal im Bestand der UB Hagen? View record from PASCAL Archive
Zeitschrift:	Environmental science & technology, Jg. 46 (2012), Heft 3, S. 1764-1773
Veröffentlichung:	Washington, DC: American Chemical Society, 2012
Medientyp:	academicJournal
Umfang:	print, 34 ref
ISSN:	0013-936X (print)
Schlagwort:	Europe Europa Royaume-Uni United Kingdom Reino Unido Irlande du Nord Northern Ireland Ulster Biotechnology Biotechnologies Ecology Ecologie Energy Énergie Environment Environnement Pollution Sciences exactes et technologie Exact sciences and technology Sciences appliquees Applied sciences Pollution atmosphérique Atmospheric pollution Etude de la physicochimie des polluants: propriétés, effets, réactions, transport et distribution Pollutants physicochemistry study: properties, effects, reactions, transport and distribution Composé organique Organic compounds Compuesto orgánico Métal lourd Heavy metal Metal pesado Autoépuration Selfpurification Autopurificación Bactérie méthanogène Methanogenic bacteria Bacteria metanogénica Carbone 13 Carbon 13 Chlore composé organique Organic chlorine compounds Devenir polluant Pollutant behavior Evolución contaminante Décharge déchet Waste dumping Depósito de residuos Dégradation biologique Biodegradation Degradación biológica Dégradation chimique Chemical degradation Degradación química Effet isotopique cinétique Kinetic isotope effect Efecto isotópico cinético Emission polluant Pollutant emission Emisión contaminante Fer Iron Hierro Fluide CFC CFC fluid Fluido CFC Fluor composé organique Organic fluorine compounds Fractionnement isotopique Isotopic fractionation Fraccionamiento isotópico Fréon Freon Freón Halogène composé organique Organic halogen compounds Hydrocarbure chloré Chlorocarbon Hidrocarburo clorado Hydrocarbure fluoré Fluorocarbon Hidrocarburo fluorado Hydrocarbure halogéné Halogenated hydrocarbon Hidrocarburo halogenado Isotope stable Stable isotopes Métal zérovalent Zerovalent metal Metal cerovalente Méthode mesure Measurement method Método medida Pollution air Air pollution Contaminación aire Subject Geographic: Europe Europa Royaume-Uni United Kingdom Reino Unido Irlande du Nord Northern Ireland Ulster
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Article File Description: text Language: English Author Affiliations: Environmental Engineering Research Centre (EERC), Queen's University Belfast, School of Planning, Architecture & Civil Engineering, David Keir Building, Stranmillis Road, Belfast, Northern Ireland, BT9 5AG, United Kingdom Rights: Copyright 2014 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: Pollution

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Carbon Isotopic Fractionation of CFCs during Abiotic and Biotic Degradation