Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/acs.est.9b05746
Titel (primär) Transformation of chlorofluorocarbons investigated via stable carbon compound-specific isotope analysis
Autor Phillips, E.; Gilevska, T.; Horst, A.; Manna, J.; Seger, E.; Lutz, E.J.; Norcross, S.; Morgan, S.A.; West, K.A.; Mack, E.E.; Dworatzek, S.; Webb, J.; Sherwood Lollar, B.
Quelle Environmental Science & Technology
Erscheinungsjahr 2020
Department ISOBIO
Band/Volume 54
Heft 2
Seite von 870
Seite bis 878
Sprache englisch
Abstract Compound-specific isotope analysis (CSIA) is a valuable tool in contaminant remediation studies. Chlorofluorocarbons (CFCs) are ozone-depleting substances previously thought to be persistent in groundwater under most geochemical conditions but more recently have been found to (bio)transform in some laboratory experiments. To date, limited applications of CSIA to CFCs have been undertaken. Here, biotransformation-associated carbon isotope enrichment factors, εC,bulk for CFC-113 (εC,bulk = −8.5 ± 0.4‰) and CFC-11 (εC,bulk = −14.5 ± 1.9‰), were determined. δ13C signatures of pure-phase CFCs and hydrochlorofluorocarbons were measured to establish source signatures. These findings were applied to investigate potential in situ CFC transformation in groundwater at a field site, where carbon isotope fractionation of CFC-11 suggests naturally occurring biotransformation by indigenous microorganisms. The maximum extent of CFC-11 transformation is estimated to be up to 86% by an approximate calculation using the Rayleigh concept. CFC-113 δ13C values in contrast were not resolvably different from pure-phase sources measured to date, demonstrating that CSIA can aid in identifying which compounds may, or may not, be undergoing reactive processes at field sites. Science and public attention remains focused on CFCs, as unexplained source inputs to the atmosphere have been recently reported, and the potential for CFC biotransformation in surface and groundwaters remains unclear. This study proposes δ13C CSIA as a novel application to study the fate of CFCs in groundwater
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Phillips, E., Gilevska, T., Horst, A., Manna, J., Seger, E., Lutz, E.J., Norcross, S., Morgan, S.A., West, K.A., Mack, E.E., Dworatzek, S., Webb, J., Sherwood Lollar, B. (2020):
Transformation of chlorofluorocarbons investigated via stable carbon compound-specific isotope analysis
Environ. Sci. Technol. 54 (2), 870 - 878 10.1021/acs.est.9b05746