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Volume 24 Issue 2
Apr 2013
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Journal of Earth Science  > 2013  >  24(2): 274-281.
Yiqun Gan, Tingting Yu, Aiguo Zhou, Yunde Liu, Cunfu Liu. A Technique for Carbon and Chlorine Isotope Analyses of Chlorinated Aliphatic Hydrocarbons in Groundwater. Journal of Earth Science, 2013, 24(2): 274-281. doi: 10.1007/s12583-013-0328-z
Citation: Yiqun Gan, Tingting Yu, Aiguo Zhou, Yunde Liu, Cunfu Liu. A Technique for Carbon and Chlorine Isotope Analyses of Chlorinated Aliphatic Hydrocarbons in Groundwater. Journal of Earth Science, 2013, 24(2): 274-281. doi: 10.1007/s12583-013-0328-z
shu

A Technique for Carbon and Chlorine Isotope Analyses of Chlorinated Aliphatic Hydrocarbons in Groundwater

doi: 10.1007/s12583-013-0328-z
  • 1.

    School of Environmental Studies, China University of Geosciences, Wuhan 430074, China

  • 2.

    State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China

Funds:

the National Natural Science Foundation of China 40772156

the National Natural Science Foundation of China 41072179

More Information
  • Corresponding author: Yiqun Gan, yiqungan@cug.edu.cn
  • Received Date: 10 Jul 2012
  • Accepted Date: 28 Nov 2012
  • Publish Date: 01 Apr 2013
    Abstract
  • Chlorinated aliphatic hydrocarbons (CAHs), significant contaminants in groundwater, can be characterized by stable isotopic compositions of carbon and chlorine. Previously published methods were of low analytical sensitivity or not ideal for natural samples with low concentrations of CAHs. This method is reported here to carry out simultaneously carbon and chlorine isotope analyses for micromolar concentrations of dissolved CAHs. It was executed by extracting and converting CAHs to carbon dioxide and methyl chloride (CH3Cl). Specially, a continuous-flow interface GasBench Ⅱ was used to extract CH3Cl for online chlorine isotope analysis. As a result, it greatly enhances the efficiency for isotope analysis by eliminating procedures for offline CH3Cl preparation and separation. Sample size requirement was reduced to approximately 11 μmol chlorine. The standard deviation of δ13C and δ37Cl for both TCE solvents and water samples was better than 0.30‰ and 0.20‰ (1σ), respectively. Carbon and chlorine isotope analyses can be used as an important tool to study the sources of organic contaminants in groundwater and their behaviors in the aquifers. The method is applicable to manufacturers' products as well as a sample from a polluted site in principle, which will be validated in our field studies.

     

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