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首页> 外文期刊>Journal of Contaminant Hydrology >Carbon and hydrogen isotope effects during sorption of organic contaminants on carbonaceous materials
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Carbon and hydrogen isotope effects during sorption of organic contaminants on carbonaceous materials

机译：碳质材料吸附有机污染物期间的碳和氢同位素效应

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摘要

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 (0.5 per thousand for δ~(13)C, and 8 per thousand for δ~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.
机译：稳定的碳和氢同位素可以有效地验证地下水中有机污染物的生物降解，因为它会导致同位素分馏。在现场应用此方法的先决条件是证明，降低同位素浓度的其他过程相对于同位素效应而言是保守的。在本文中，我们显示了卤代烃化合物的碳同位素[三氯乙烯（TCE），顺式二氯乙烯（c-DCE），氯乙烯（VC）]以及BTEX化合物（苯，甲苯，对二甲苯）的碳和氢同位素，在平衡吸附到活性炭，褐煤焦炭和褐煤上的过程中，没有发生明显的分离。通常，影响在分析仪器的再现性极限范围内（δ〜（13）C为0.5 /千，δ〜2H为8 /千）。观察到的吸附部分少于5％到超过95％。同样，对于速率限制的三氯乙烯在活性炭上的吸附，未观察到碳同位素的明显分馏。这些发现支持以下假设：对于这类化合物，含水层系统中的吸附过程相对于同位素效应而言是保守的。

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