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Audí-Miró, C.* ; Cretnik, S. ; Torrentó, C.* ; Rosell, M.* ; Shouakar-Stash, O.* ; Otero, N.* ; Palau, J.* ; Elsner, M. ; Soler, A.*

C, Cl and H compound-specific isotope analysis to assess natural versus Fe(0) barrier-induced degradation of chlorinated ethenes at a contaminated site.

J. Hazard. Mater. 299, 747-754 (2015)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Compound-specific isotopic analysis of multiple elements (C, Cl, H) was tested to better assess the effect of a zero-valent iron-permeable reactive barrier (ZVI-PRB) installation at a site contaminated with tetrachloroethene (PCE) and trichloroethene (TCE). The focus was on (1) using (13)C to evaluate natural chlorinated ethene biodegradation and the ZVI-PRB efficiency; (2) using dual element (13)C-(37)Cl isotopic analysis to distinguish biotic from abiotic degradation of cis-dichloroethene (cis-DCE); and (3) using (13)C-(37)Cl-(2)H isotopic analysis of cis-DCE and TCE to elucidate different contaminant sources. Both biodegradation and degradation by ZVI-PRB were indicated by the metabolites that were detected and the (13)C data, with a quantitative estimate of the ZVI-PRB efficiency of less than 10% for PCE. Dual element (13)C-(37)Cl isotopic plots confirmed that biodegradation was the main process at the site including the ZVI-PRB area. Based on the carbon isotope data, approximately 45% and 71% of PCE and TCE, respectively, were estimated to be removed by biodegradation. (2)H combined with (13)C and (37)Cl seems to have identified two discrete sources contributing to the contaminant plume, indicating the potential of δ(2)H to discriminate whether a compound is of industrial origin, or whether a compound is formed as a daughter product during degradation.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Chlorinated Ethenes ; Stable Isotopes ; Zero-valent Iron
ISSN (print) / ISBN 0304-3894
e-ISSN 1873-3336
Journal Journal of Hazardous Materials
Quellenangaben Volume: 299, Issue: , Pages: 747-754 Article Number: , Supplement: ,
Publisher Elsevier
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Groundwater Ecology (IGOE)