Multi-element (C, H, Cl, Br) stable isotope fractionation as a tool to investigate transformation processes for halogenated hydrocarbons

Compound-specific isotope analysis (CSIA) is a powerful tool to evaluate transformation processes of halogenated compounds. Many halogenated hydrocarbons allow for multiple stable isotopic systems (C, H, Cl, Br) to be measured for a single compound. This has led to a large body of literature describ...

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Bibliographic Details
Published in:Environmental science--processes & impacts 2020-03, Vol.22 (3), p.567-582
Main Authors: Ojeda, Ann Sullivan, Phillips, Elizabeth, Sherwood Lollar, Barbara
Format: Article
Language:English
Subjects:
Alkanes
Alkenes
Brominated hydrocarbons
Bromination
Chlorinated hydrocarbons
Contaminants
Fractionation
Halogenated compounds
Halogenated hydrocarbons
Halogenation
Hydrocarbons
Isotope fractionation
Isotopes
Reaction mechanisms
Stable isotopes
Transformations
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Summary:Compound-specific isotope analysis (CSIA) is a powerful tool to evaluate transformation processes of halogenated compounds. Many halogenated hydrocarbons allow for multiple stable isotopic systems (C, H, Cl, Br) to be measured for a single compound. This has led to a large body of literature describing abiotic and biotic transformation pathways and reaction mechanisms for contaminants such as chlorinated alkenes and alkanes as well as brominated hydrocarbons. Here, the current literature is reviewed and a new compilation of Λ values for multi-isotopic systems for halogenated hydrocarbons is presented. Case studies of each compound class are discussed and thereby the current strengths of multi-element isotope analysis, continuing challenges, and gaps in our current knowledge are identified for practitioners of multi-element CSIA to address in the near future. A review that highlights the utility of multi-element compound-specific isotope analysis (CSIA) in halogenated hydrocarbon remediation.
ISSN:2050-7887
2050-7895
DOI:10.1039/c9em00498j