Université de Neuchâtel

Intrinsic biodegradation potential of aromatic hydrocarbons in an alluvial aquifer - Potentials and limits of signature metabolite analysis and two stable isotope-based techniques

Morasch, Barbara ; Hunkeler, Daniel ; Zopfi, Jakob ; Temime, B ; Höhener, Patrick

In: Water Research, 2011, vol. 45, p. 4459-4469

Three independent techniques were used to assess the biodegradation of monoaromatic hydrocarbons and low-molecular weight polyaromatic hydrocarbons in the alluvial aquifer at the site of a former cokery (Flémalle, Belgium). Firstly, a stable carbon isotope-based field method allowed quantifying biodegradation of monoaromatic compounds in situ and confirmed the degradation of...

Université de Neuchâtel

Quantification of biodegradation for o-xylene and naphthalene using first order decay models, Michaelis–Menten kinetics and stable carbon isotopes

Blum, P. ; Hunkeler, Daniel ; Weede, M ; Beyer, C ; Grathwohl, P ; Morasch, Barbara

In: Journal of Contaminant Hydrology, 2009, vol. 105, no. 3-4, p. 118-130

At a former wood preservation plant severely contaminated with coal tar oil, in situ bulk attenuation and biodegradation rate constants for several monoaromatic (BTEX) and polyaromatic hydrocarbons (PAH) were determined using (1) classical first order decay models, (2) Michaelis–Menten degradation kinetics (MM), and (3) stable carbon isotopes, for o-xylene and naphthalene. The...

Université de Neuchâtel

Benzene dispersion and natural attenuation in an alluvial aquifer with strong interactions with surface water

Batlle-Aguilar, Jordi ; Brouyère, Serge ; Dassargues, Alain ; Morasch, Barbara ; Hunkeler, Daniel ; Höhener, Patrick ; Diels, Ludo ; Vanbroekhoven, Karolien ; Seuntjens, Piet ; Halend, Henri

In: Journal of Hydrology, 2009, vol. 369, no. 3-4, p. 305–317

Field and laboratory investigations have been conducted at a former coke plant, in order to assess pollutant attenuation in a contaminated alluvial aquifer, discharging to an adjacent river. Various organic (BTEX, PAHs, mineral oils) and inorganic (As, Zn, Cd) compounds were found in the aquifer in concentrations exceeding regulatory values. Due to redox conditions of the aquifer, heavy metals...

Université de Neuchâtel

Evidence for in situ degradation of mono-and polyaromatic hydrocarbons in alluvial sediments based on microcosm experiments with 13C-labeled contaminants

Morasch, Barbara ; Höhener, P. ; Hunkeler, Daniel

In: Environmental Pollution, 2007, vol. 148, no. 3, p. 739-748

A microcosm study was conducted to investigate the degradation of mono- and polyaromatic hydrocarbons under in situ-like conditions using alluvial sediments from the site of a former cokery. Benzene, naphthalene, or acenaphthene were added to the sediments as 13C-labeled substrates. Based on the evolution of 13C-CO2 determined by gas chromatography isotope-ratio...

Université de Neuchâtel

Deposition, persistence and turnover of pollutants: First results from the EU project AquaTerra for selected river basins and aquifers

Barth, J. A. C. ; Steidle, D. ; Kuntz, D. ; Gocht, T. ; Mouvet, C. ; von Tümpling, W. ; Lobe, I. ; Langenhoff, A. ; Albrechtsen, H.-J. ; Janniche, G. S. ; Morasch, Barbara ; Hunkeler, Daniel ; Grathwohl, P.

In: Science of The Total Environment, 2007, vol. 376, no. 1-3, p. 40-50

Deposition, turnover and movement of persistent organic pollutants (POP) were investigated in the EU integrated project “AquaTerra”, which is among the first funded environmental projects within the 6th Framework Program by the European Commission. Project work integrates across various disciplines that range from biogeochemistry, environmental engineering, computer modelling and chemistry to...