Université de Neuchâtel

Carbon Isotope Fractionation During Volatilization of Petroleum Hydrocarbons and Diffusion Across a Porous Medium: A Column Experiment

Bouchard, Daniel ; Höhener, Patrick ; Hunkeler, Daniel

In: Environmental Science & Technology, 2008, vol. 42, no. 21, p. 7801–7806

The study focuses on the effect of volatilization, diffusion, and biodegradation on the isotope evolution of volatile organic compounds (VOCs) in a 1.06 m long column filled with alluvial sand. A liquid mixture of 10 VOCs was placed at one end of the column, and measurements of VOC vapor concentrations and compound-specific isotope ratios (δ13C) were performed at the source and along...

Université de Neuchâtel

Regional water quality patterns in an alluvial aquifer : Direct and indirect influences of rivers

Baillieux, Antoine ; Campisi, Diego ; Jammet, Nicolas ; Bucher, Samuel ; Hunkeler, Daniel

In: Journal of Contaminant Hydrology, 2014, vol. 169, p. 123-131

The influence of rivers on the groundwater quality in alluvial aquifers can be twofold: direct and indirect. Rivers can have a direct influence via recharge and an indirect one by controlling the distribution of fine-grained, organic-carbon rich flood deposits that induce reducing conditions. These direct and indirect influences were quantified for a large alluvial aquifer on the Swiss Plateau...