Abstract
We used C-Cl dual isotope analysis and microcosm studies for elucidating the origin and fate of the common groundwater pollutant dichloromethane (DCM) in two different multi-contaminant field sites in Catalonia, Spain; where DCM contamination could be the result of direct solvent releases and/or chloroform (CF) transformation. Known commercial solvents isotopic compositions as well as characteristic C-Cl dual isotope slopes from our anaerobic enrichment culture containing Dehalobacterium sp., capable of fermenting DCM, and other bacteria from the literature were used for field data interpretation.
Highlights
Dichloromethane (DCM) can be naturally released; it is often detected in subsurface waters as a result of its extensive use and improper handling in industrial facilities, causing severe aquifer contamination [1]
We used C-Cl dual isotope analysis and microcosm studies for elucidating the origin and fate of the common groundwater pollutant dichloromethane (DCM) in two different multi-contaminant field sites in Catalonia, Spain; where DCM contamination could be the result of direct solvent releases and/or chloroform (CF) transformation
Known commercial solvents isotopic compositions as well as characteristic C-Cl dual isotope slopes from our anaerobic enrichment culture containing Dehalobacterium sp., capable of fermenting DCM, and other bacteria from the literature were used for field data interpretation
Summary
Dichloromethane (DCM) can be naturally released; it is often detected in subsurface waters as a result of its extensive use and improper handling in industrial facilities, causing severe aquifer contamination [1]. Compound specific isotope analysis (CSIA) quantifies the abundance ratio of specific stable isotopes (e.g. 13C/12C, 37Cl/35Cl) in molecules of contaminants relative to an international standard [9]. This technique bears the potential for both contaminant source apportionment as well as monitoring of compound transformation processes [10]. Several laboratory studies have applied C–Cl dual isotope analysis to characterize DCM biodegradation by different bacteria [13,14]. Culture mechanisms for the elimination of DCM and to evaluate the use of 2D-CSIA as a tool for assessing DCM origin and transformation reactions in contaminated sites, carbon and chlorine stable isotopes of laboratory and field data have been analysed To compare Dehalobacterium sp. culture mechanisms for the elimination of DCM and to evaluate the use of 2D-CSIA as a tool for assessing DCM origin and transformation reactions in contaminated sites, carbon and chlorine stable isotopes of laboratory and field data have been analysed
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