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

Cl and C isotope analysis to assess the effectiveness of chlorinated ethene degradation by zero-valent iron: Evidence from dual element and product isotope values.

Appl. Geochem. 32, 175-183 (2013)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
This study investigated C and, for the first time, Cl isotope fractionation of trichloroethene (TCE) and cis-dichloroethene (cis-DCE) during reductive dechlorination by cast zero-valent iron (ZVI). Hydrogenolysis and β-dichloroelimination pathways occurred as parallel reactions, with ethene and ethane deriving from the β-dichloroelimination pathway. Carbon isotope fractionation of TCE and cis-DCE was consistent for different batches of Fe studied. Transformation of TCE and cis-DCE showed Cl isotopic enrichment factors (εCl) of −2.6‰ ± 0.1‰ (TCE) and −6.2‰ ± 0.8‰ (cis-DCE), with Apparent Kinetic Isotope Effects (AKIECl) for Cl of 1.008 ± 0.001 (TCE) and 1.013 ± 0.002 (cis-DCE). This indicates that a C–Cl bond breakage is rate-determining in TCE and cis-DCE transformation by ZVI. Two approaches were investigated to evaluate if isotope fractionation analysis can distinguish the effectiveness of transformation by ZVI as opposed to natural biodegradation. (i) Dual isotope plots. This study reports the first dual (C, Cl) element isotope plots for TCE and cis-DCE degradation by ZVI. The pattern for cis-DCE differs markedly from that reported for biodegradation of the same compound by KB-1, a commercially available Dehalococcoides-containing culture. The different trends suggest an expedient approach to distinguish abiotic and biotic transformation, but this needs to be confirmed in future studies. (ii) Product-related isotope fractionation. Carbon isotope ratios of the hydrogenolysis product cis-DCE differed consistently by 10‰ compared to the β-dichloroelimination products ethene and ethane providing a second line of evidence to differentiate abiotic or biotic degradation pathways.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter Reductive Dechlorination ; Metallic Iron ; Carbon ; Fractionation ; Trichloroethylene ; Dehalogenation ; Transformation ; Pathways ; Kinetics ; Ratios
ISSN (print) / ISBN 0883-2927
e-ISSN 0883-2927
Zeitschrift Applied Geochemistry
Quellenangaben Band: 32, Heft: , Seiten: 175-183 Artikelnummer: , Supplement: ,
Verlag Elsevier
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Groundwater Ecology (IGOE)