Abstract
The biotransformation of toluene, benzene and naphthalene was examined in anaerobic sediment columns. Five columns filled with a mixture of sediments were operated in the presence of bicarbonate, sulfate, iron, manganese, or nitrate as electron acceptor. The columns were continuously percolated with a mixture of the three organic compounds (individual concentrations 25–200 μM) at 20°C.
Toluene was transformed readily (within 1 to 2 months) under all redox conditions tested. Benzene was recalcitrant over the test period of 375–525 days in all five columns. Naphthalene was partly transformed in the column with nitrate or manganese as electron acceptor present; the addition of benzoate had a positive effect in the column with nitrate. In the column with sulfate, the majority of the added naphthalene disappeared. No effect was observed after adding and omitting an easier degradable substrate. [14C]naphthalene was used to confirm this disappearance to be the result of degradation; two third of the naphthalene was converted to CO2.
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Langenhoff, A.A.M., Zehnder, A.J.B. & Schraa, G. Behaviour of toluene, benzene and naphthalene under anaerobic conditions in sediment columns. Biodegradation 7, 267–274 (1996). https://doi.org/10.1007/BF00058186
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DOI: https://doi.org/10.1007/BF00058186