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首页> 外文期刊>Ground Water Monitoring & Remediation >Effect of H_2 and Redox Condition on Biotic and Abiotic MTBE Transformation
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Effect of H_2 and Redox Condition on Biotic and Abiotic MTBE Transformation

机译：H_2和氧化还原条件对生物和非生物MTBE转化的影响

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Laboratory studies conducted with surface water sediment from a methyl tert-butyl ether (MTBE)-contaminated site in South Carolina demonstrated that, under methanogenic conditions, [U-~(14)C] MTBE was transformed to ~(14)C tert-butyl alcohol (TBA) with no measurable production of ~(14)CO_2. Production of TBA was not attributed to the activity of methanogenic microorganisms, however, because comparable transformation of [U-~(14)C] MTBE to ~(14)C-TBA also was observed in heat-sterilized controls with dissolved H_2 concentrations > 5 nM. The results suggest that the transformation of MTBE to TBA may be an abiotic process that is driven by biologically produced H_2 under in situ conditions. In contrast, mineralization of [U-~(14)C] MTBE to ~(14)CO_2 was completely inhibited by heat sterilization and only observed in treatments characterized by dissolved H_2 concentrations < 2 nM. These results suggest that the pathway of MTBE transformation is influenced by in situ H_2 concentrations and that in situ H_2 concentrations may be an useful indicator of MTBE transformation pathways in ground water systems.
机译：对来自南卡罗来纳州甲基叔丁基醚（MTBE）污染地点的地表水沉积物进行的实验室研究表明，在产甲烷条件下，[U-〜（14）C] MTBE被转化为〜（14）C叔-丁醇（TBA），没有可测量的〜（14）CO_2生成量。 TBA的产生不归因于产甲烷微生物的活性，因为在溶解H_2浓度> 2的热灭菌对照中还观察到[U-〜（14）C] MTBE向〜（14）C-TBA的相当转化。 5 nM。结果表明，MTBE向TBA的转化可能是非生物过程，它是在原位条件下由生物产生的H_2驱动的。相比之下，[U-〜（14）C] MTBE矿化成〜（14）CO_2的现象被加热灭菌完全抑制，并且仅在以溶解的H_2浓度<2 nM为特征的处理中才能观察到。这些结果表明，MTBE转化途径受原位H_2浓度的影响，并且原位H_2浓度可能是地下水系统MTBE转化途径的有用指标。

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