# Carbon and hydrogen isotope effects during sorption of organic contaminants on carbonaceous materials

## Abstract

Stable carbon and hydrogen isotopes can be an efficient means to validate biodegradation of organic contaminants in groundwater since it results in an isotopic fractionation. A prerequisite in applying this method in the field is the proof that other processes decreasing the contaminant concentration are conservative with respect to isotope effects. In this paper we show for carbon isotopes of halogenated hydrocarbon compounds trichloroethene (TCE), cis-dichloroethene (c-DCE), vinylchloride (VC) and carbon and hydrogen isotopes of BTEX compounds (benzene, toluene, p-xylene) that no significant fractionation occurs during equilibrium sorption onto activated carbon, lignite coke and lignite. In general, effects were in the range of the reproducibility limit of the analytical instrument (0.5â�° for $\delta$13C, and 8â�° for $\delta$2H). This observation was made for fractions sorbed of less than 5{\%} to more than 95{\%}. Also for rate-limited sorption of TCE onto activated carbon, no significant fractionation in carbon isotopes could be observed. These findings support the assumption that for these classes of compounds, sorption processes in aquifer systems are conservative with respect to isotope effects. {\textcopyright} 2003 Elsevier Science B.V. All rights reserved.

Item Type: Article 2003 Schüth, Christoph and Taubald, Heinrich and Bolaño, Nerea and Maciejczyk, Kirsten Carbon and hydrogen isotope effects during sorption of organic contaminants on carbonaceous materials English Stable carbon and hydrogen isotopes can be an efficient means to validate biodegradation of organic contaminants in groundwater since it results in an isotopic fractionation. A prerequisite in applying this method in the field is the proof that other processes decreasing the contaminant concentration are conservative with respect to isotope effects. In this paper we show for carbon isotopes of halogenated hydrocarbon compounds trichloroethene (TCE), cis-dichloroethene (c-DCE), vinylchloride (VC) and carbon and hydrogen isotopes of BTEX compounds (benzene, toluene, p-xylene) that no significant fractionation occurs during equilibrium sorption onto activated carbon, lignite coke and lignite. In general, effects were in the range of the reproducibility limit of the analytical instrument (0.5â�° for $\delta$13C, and 8â�° for $\delta$2H). This observation was made for fractions sorbed of less than 5{\%} to more than 95{\%}. Also for rate-limited sorption of TCE onto activated carbon, no significant fractionation in carbon isotopes could be observed. These findings support the assumption that for these classes of compounds, sorption processes in aquifer systems are conservative with respect to isotope effects. {\textcopyright} 2003 Elsevier Science B.V. All rights reserved. Journal of Contaminant Hydrology 64 3-4 Elsevier 0169-7722 Carbon isotopes,Hydrogen isotopes,Isotopic fractionation,Natural attenuation,Sorption 11 Department of Materials and Earth Sciences11 Department of Materials and Earth Sciences > Earth Science11 Department of Materials and Earth Sciences > Earth Science > Hydrogeology 17 Apr 2018 12:20 10.1016/S0169-7722(02)00216-4 http://www.ncbi.nlm.nih.gov/pubmed/12814884 Multiline CSVJSONMODSRDF+XMLEndNoteAtomBibTeXDublin CoreASCII CitationSimple MetadataT2T_XMLHTML CitationReference ManagerEP3 XML

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