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Electronic address: jean. Estimating intermediate water residence times a few years to a century in shallow aquifers is critical to quantifying groundwater vulnerability to nutrient loading and estimating realistic recovery timelines. In this context, we developed a framework to assess the capacity of dissolved silica DSi to inform residence times in shallow aquifers. We calibrated silicate weathering rates with CFCs from multiple wells in five crystalline aquifers in Brittany and in the Vosges Mountains France.

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Hydrochemical studies in ground water of the Federal District: subsidies to the flow conceptual model.

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Environmental tracers are natural or man made anthropogenic compounds or isotopes that are widely distributed in the near-surface environment. Variations in their quantities can be used to determine pathways and timescales of environmental processes. They include naturally occurring isotopes such as carbon and anthropogenic tracers such as Chlorofluorcarbons CFCs.

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