ArticleEnvironmental science & technology2026
Isotopic Fractionation and Masking Effects during Biotransformation of Chlorinated Ethanes.
Article in Environmental science & technology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Chlorinated ethanes, such as 1,1,1-trichloroethane (1,1,1-TCA) and 1,1-dichloroethane (1,1-DCA), are common groundwater contaminants that undergo abiotic and biotic transformation, although the specific mechanisms remain unresolved. Compound-specific isotope analysis (CSIA) can provide insight into transformation mechanisms, but its application to chlorinated ethanes has been limited compared to the extensive literature on chlorinated ethenes. This study presents the first dual-element stable isotope (carbon and chlorine) analysis of 1,1,1-TCA and 1,1-DCA biotransformation by an enriched microbial culture commonly used in field remediation. The isotopic fractionation (ε) values for carbon and chlorine are -5.8 ± 0.8‰ and -2.8 ± 0.3‰, respectively, for 1,1,1-TCA and are -8.9 ± 1.0‰ and -4.3 ± 0.5‰, respectively, for 1,1-DCA. Dual-isotope plots produced slopes (Λ
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