Carbon and chlorine isotope fractionation of chlorinated aliphatic hydrocarbons by evaporation

Two pure solvents (trichloroethene and dichloromethane) were evaporated at room temperature (24±1°C). The carbon and chlorine isotopic compositions of the residual solvents were measured as a function of the fraction remaining. Isotopic fractionation factors ( α) derived from these experimental resu...

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Bibliographic Details
Published in:Organic geochemistry 1999-01, Vol.30 (8), p.777-785
Main Authors: Huang, L, Sturchio, N.C, Abrajano, T, Heraty, L.J, Holt, B.D
Format: Article
Language:English
Subjects:
Biodegradation
CARBON
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE ISOTOPES
ENVIRONMENTAL SCIENCES
EVAPORATION
FRACTIONATION
Hydrocarbons
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Isotopes
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Summary:Two pure solvents (trichloroethene and dichloromethane) were evaporated at room temperature (24±1°C). The carbon and chlorine isotopic compositions of the residual solvents were measured as a function of the fraction remaining. Isotopic fractionation factors ( α) derived from these experimental results are 1.00031±0.00004 for C and 0.99818±0.00022 for Cl in trichloroethene, and 1.00065±0.00002 for C and 0.99952±0.00006 for Cl in dichloromethane. The negative correlation between δ 13C and δ 37Cl values caused by evaporation of chlorinated aliphatic hydrocarbons can be used to distinguish evaporation from biodegradation in contaminated systems.
ISSN:0146-6380
1873-5290
DOI:10.1016/S0146-6380(99)00060-1