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Hamonts, K.* ; Kuhn, T.K. ; Maesen, M.* ; Bronders, J.* ; Lookman, R.* ; Kalka, H.* ; Diels, L.* ; Meckenstock, R.U. ; Springael, D.* ; Dejonghe, W.*

Factors determining the attenuation of chlorinated aliphatic hydrocarbons in eutrophic river sediment impacted by discharging polluted groundwater.

Environ. Sci. Technol. 43, 5270-5275 (2009)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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This study explored them potential of eutrophic river sediment to attenuate the infiltration of chlorinated aliphatic hydrocarbon (CAH)- polluted groundwater discharging into the Zenne River near Brussels, Belgium. Active CAH biodegradation by reductive dechlorination in the sediment was suggested by a high dechlorination activity in microcosms containing sediment samples and the detection of dechlorination products in sediment pore water. A unique hydrogeochemical evaluation, including a delta H-2 and delta O-18 stable isotope approach, allowed to determine the contribution of different abiotic and biotic CAH attenuation processes and to delineate their spatial distribution in the riverbed. Reductive dechlorination of the CAHs seemed to be the most widespread attenuation process, followed by dilution by unpolluted groundwater. discharge and by surface water mixing. Although CAHs were never detected in tie surface water, 26-28% of the investigated locations in the riverbed did not show CAH attenuation. We conclude that the. riverbed sediments can attenuate infiltrating CAHs to a certain extent, but will probably not completely prevent CAHs to discharge from the contaminated groundwater into the Zenne River.

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