Mount Etna, the largest volcano in Europe and one of the most active in the world, is the site of an important circulation of ground waters that as, a consequence of the peculiar geological, hydrogeological and petrological features of Etna volcanics, are enriched in certain chemical species (i.e. HCO#B3#F-Na#F+Mg#F2#F+Ca#F2#F+and many trace elements).
This is mainly due to the interaction between ground waters and volcanic gases, mainly CO#B2, that are present in the underground atmosphere.
CO#B2 is dissolved into water thus making it very aggressive towards the host volcanic rocks so that cations are gradually brought into solution.
Mg, Mn, Fe and V concentrations above the Maximum Admissible Concentrations (MACs) fixed by the European standards were found in most of the potable waters of Etna, especially in those from its eastern and western flanks, where the amount of CO#B2 dissolved in the ground water is greatest.
Therefore, about 700,000 people have used potable waters with Mg contents exceeding the European MACs, 90,000 have used those with Mn exceeding MACs, 63,000 have used those with Fe exceeding MACs and more than 600,000 have used waters with V above the EPA acceptability level.
Considering that these elements are essential for humans and that Mg, Mn and Fe contents in Etna waters account for only a small percentage of their total dietary intake, it is unlikely that direct health consequences can derive from drinking such waters.
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Mots-clés Pascal : Volcan Etna, Sicile, Italie, Europe, Hydrochimie, Eau souterraine, Magnésium, Manganèse, Fer, Vanadium, Analyse élément trace, Qualité eau, Eau potable, Enrichissement, Ion bicarbonate, Sodium, Calcium, Gaz carbonique, Départ gaz, Matière dissoute, Géothermométrie, Santé publique, Gaz volcanique, Interaction eau gaz
Mots-clés Pascal anglais : Mount Etna, Sicily, Italy, Europe, hydrochemistry, ground water, magnesium, manganese, iron, vanadium, trace elements, water quality, drinking water, enrichment, bicarbonate ion, sodium, calcium, carbon dioxide, degassing, dissolved materials, geologic thermometry
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0154066
Code Inist : 001E01N02. Création : 199608.