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| Titel |
A Novel Method for Analyzing Chlorine Isotope Fractionation for Source and Fate Assessment of Organochlorine Soil and Groundwater Pollutants |
| VerfasserIn |
Christoph Aeppli, Charline Wiegert, Henry Holmstrand, Per Andersson, Örjan Gustafsson |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036526
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| Zusammenfassung |
| We developed a simple and accurate analytical method for compound-specific determination
of chlorine isotopic composition (δ37Cl) or organochlorines based on GC/MS analysis and
standard isotope bracketing. Good accuracy (comparison with off-line thermal ionization
mass spectrometry) and a precision comparable to other on-line δ37Cl-methods (0.6 permil vs
SMOC) were achieved. We applied this method to assess biodegradation of polychlorinated
phenols used for wood preservation at a former sawmill site in northern Sweden. To come up
with a δ37Cl-based estimation of the importance of on-going aerobic microbial
degradation, we analyzed 37Cl-enrichment during enzymatic dechlorination of
polychlorinated phenols in laboratory experiments. We also investigated δ37Cl fingerprints of
chloroperoxidase-mediated chlorinated phenols, which can be used for apportionment of
natural and anthropogenic sources of chlorophenols in boreal soils. Furthermore, we
investigated natural attenuation of chlorinated ethenes in a contaminated aquifer in the Czech
Republic. At this site, the extent of naturally occurring reductive tetrachloroethene (PCE)
dechlorination was estimated based on PCE-δ37Cl. Overall, our laboratory and field studies
demonstrate the potential of using compound-specific chlorine isotope analysis for
assessing the source and fate of organochlorine groundwater and soil contaminants. |
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