In situ microcosms, geochemical and isotope techniques to characterise anaerobic benzene degradation | Analyse des anaeroben Benzolabbaus: Vergleich von In-situ-Mikrokosmen, Elektronenakzeptorbilanzen und Isotopenfraktionierungsprozessen
2006
Stelzer, Nicole | Fischer, Anko | Richnow, Hans-Hermann | Kästner, Matthias
Geochemical and isotope chemical methods were applied to assess the in situ biodegradation of benzene in a shallow aquifer (Zeitz, Germany). The vertical structure of the plume was investigated in a multi level sampling approach. Benzene degradation was investigated using in situ microcosms incubated with [¹³C₆]-labelled benzene. The transformation of ¹³C into fatty acids proved biodegradation was occurring, and indicated that a complex microbial community is colonising the in situ microcosms. The depletion of sulphate in the plume indicated sulphate-reducing conditions may account for the oxidation of 1.7 mmol/l benzene. The concentration and isotopic composition of dissolved inorganic carbon indicated a degradation of 2.2 mmol/l benzene within the plume. The isotopic composition of benzene suggested an average degradation of 3.0 mmol/l benzene. The various approaches used to assess benzene degradation were within the same order, and illustrated significant benzene degradation in the anaerobic aquifer.
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