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

被引：0

作者：

甘义群 ^{[1
,2
]}

余婷婷 ^{[1
,2
]}

周爱国 ^{[1
,2
]}

刘运德 ^{[1
,2
]}

刘存富 ^{[1
]}

机构：

[1] School of Environmental Studies, China University of Geosciences

[2] State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences

来源：

Journal of Earth Science | 2013年 / 02期

关键词：

chlorine isotope; carbon isotope; chlorinated aliphatic hydrocarbon (CAH); groundwa-ter; organic contamination;

D O I：

暂无

中图分类号：

X523 [地下水];

学科分类号：

0815 ;

摘要：

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 manu-facturers' products as well as a sample from a polluted site in principle, which will be validated in our field studies.

引用

页码：274 / 281

页数：8

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