Mineral waters. Chemical composition. Interaction water-rock. Aquifer. Subsoil geological characteristics. Hydrogeology.

The composition of comercial mineral bootling water is different depending on the source origin. Although we could think that all waters have the same taste, if we refine our perception, we will be able to identify some aspects that allow to distinct them. We will be also able to relate the chemical composition with the interactions between water and rocks that have been occurred through the subsoil or aquifer water flowing.


We will have several mineral waters selected by having different water source origin. The proposed activity is to do a “blind tasting” of these waters with a “porró” (glass wine jar with a long tapered drinking spout). The tasting will allow to discovering some differences in their taste that demonstrate contrasting chemical composition.

The workshop is complemented by different posters that describe the fundamentals of subsoil water flow and the chemical interaction between water and rocks. A specific sheet for each water is also provided which show the geological section of the spring, a table with the chemical composition and the diagrams that allow the classification of waters from the composition of main ions. Sample of the main rocks found in the geological context of each spring are also shown, the dilution of them influence on the taste of water.

The final objective of the activity is to correlate the “unknown waters” with the different sheets that describe the hydrochemical and hydrogeological characteristics of each spring.


The exploitation and commercialization of mineral waters is a relevant activity in the Girona area linked to social, economic and environmental aspects. From a scientific point of view is fundamental to know the hydrogeological medium and to monitor the chemical and microbiological quality. These aspects are linked to the degrees of Environmental Sciences, Chemistry or Biology given by the Faculty of Sciences.

The researchers at the Geodynamic Area in the Department of Environmental Sciences and the GEOCAM center (http://geocamb.udg.edu/) work from long time ago in the evaluation of surface and subsurface hydrogeological resources. The group develops research focusing on the characterization of aquifers by hydrochemical and isotopical analyses. They also work in the determination of dynamics of subsoil flows and the geometric delimitation of aquifer formation form geological cartography and geophysical prospection.

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