Carbon and chlorine isotope fractionation of chlorinated aliphatic hydrocarbons by evaporation

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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Veröffentlicht in:Organic geochemistry 1999-01, Vol.30 (8), p.777-785
Hauptverfasser: Huang, L, Sturchio, N.C, Abrajano, T, Heraty, L.J, Holt, B.D
Format: Artikel
Sprache:eng
Schlagworte:
Biodegradation
CARBON
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE ISOTOPES
ENVIRONMENTAL SCIENCES
EVAPORATION
FRACTIONATION
Hydrocarbons
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Isotopes
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Zusammenfassung: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