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Tracking chlorinated contaminants in the subsurface usingcompound-specific chlorine isotope analysis: A review of principles,current challenges and applications

Jeremy Zimmermann, Landon James Szasz Halloran & Daniel Hunkeler

Résumé Many chlorinated hydrocarbons have gained notoriety as persistent organic pollutants in the environ-ment. Engineered and natural remediation efforts require a monitoring tool to track the progress ofdegradation processes. Compound-specific isotope analysis (CSIA) is a robust method to evaluate theorigin and fate of contaminants in the environment and does not rely on concentration measurements.While carbon CSIA has established itself in the routine assessment of contaminated sites, studiesincorporating chlorine isotopes have only recently become more common. Although some aspects ofchlorine isotope analysis are more challenging than carbon isotope analysis, having additional isotopicdata yields valuable information for contaminated site management. This review provides an overview ofchlorine isotope fractionation of chlorinated contaminants in the subsurface by different processes andpresents analytical techniques and unresolved challenges in chlorine isotope analysis. A summary ofsuccessfulfield applications illustrates the potential of using chlorine isotope data. Finally, approaches inmodelling chlorine isotope fractionation due to degradation, diffusion, and sorption processes arediscussed.
   
Mots-clés Compound-specific isotope analysis; Contaminants; Chlorine isotopes; Degradation pathways; Isotope fractionation; Gas chromatography-isotope-ratio mass
spectrometry
   
Citation Zimmermann, J., James Szasz Halloran, L., & Hunkeler, D. (2019). Tracking chlorinated contaminants in the subsurface usingcompound-specific chlorine isotope analysis: A review of principles,current challenges and applications. Chemosphere, 244, 125476-125495.
   
Type Article de périodique (Anglais)
Date de publication 11-2019
Nom du périodique Chemosphere
Volume 244
Pages 125476-125495
URL https://doi.org/10.1016/j.chemosphere.2019.125476