Audí Miró, CarmeCretnik, S.Torrentó, ClaraRosell, MònicaShouakar-Stash, O.Otero Pérez, NeusPalau, JordiElsner, M.Soler i Gil, Albert2020-04-152020-04-152015-12-150304-3894https://hdl.handle.net/2445/155353Compound-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 13C to evaluate natural chlorinated ethene biodegradation and the ZVI-PRB efficiency; (2) using dual element 13C-37Cl isotopic analysis to distinguish biotic from abiotic degradation of cis-dichloroethene (cis-DCE); and (3) using 13C-37Cl-2H 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 13C data, with a quantitative estimate of the ZVI-PRB efficiency of less than 10% for PCE. Dual ele- ment 13C-37Cl 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, respec- tively, were estimated to be removed by biodegradation. 2H combined with 13C and 37Cl seems to have identified two discrete sources contributing to the contaminant plume, indicating the potential of 2 H to discriminate whether a compound is of industrial origin, or whether a compound is formed as a daughter product during degradation.27 p.application/pdfengcc-by-nc-nd (c) Elsevier B.V., 2015http://creativecommons.org/licenses/by-nc-nd/3.0/esContaminació de l'aiguaDepuració d'aigües residualsHidrologia d'aigües subterràniesIsòtopsWater pollutionPurification of sewageGroundwater hydrologyIsotopesinfo:eu-repo/semantics/article6342322020-04-15info:eu-repo/semantics/openAccess