Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | OCCURRENCE OF MINOR TOXIC ELEMENTS IN VOLCANIC-SEDIMENTARY AQUIFERS: A CASE STUDY IN CENTRAL ITALY |
| Abstract | The occurrence of minor toxic elements (arsenic, vanadium and fluoride among others) in the volcanic aquifers of central Italy, with concentrations often above the national standards for drinking waters, has been recognized since the 1970s. However, these groundwaters are still often used for human consumption. With the aim of providing insight into the water-rock interaction processes, as well as into the evolution of arsenic and other elements, water-sampling campaigns where undertaken within a 100 km(2) area at the eastern margin of the Viterbo region, where volcanites overlie an alluvial aquifer complex. The samples were analysed and geochemical modelling was applied to characterize the thermodynamic state of the waters. The results indicate the existence of direct relations among arsenic, vanadium and fluoride concentrations and of their inverse relationship with calcium concentration. An evolution scheme of groundwater composition from the upstream volcanic aquifer to the downstream sedimentary aquifer is also discussed. Two hypotheses are proposed which justify the observed decrease of the cited minor element concentrations, i.e. dilution processes and/or precipitation of fluorapatite, which can include in its structure small amounts of these elements. The precipitation hypothesis is supported by modelling results. |
| Source | Hydrogeology journal 15 (6), pp. 1183–1196 |
| Journal | Hydrogeology journal |
| Editor | Springer, Berlin, Germania |
| Year | 2007 |
| Type | Articolo in rivista |
| DOI | 10.1007/s10040-007-0169-x |
| Authors | VIVONA R. (a); PREZIOSI E. (A); MADÉ B. (b); GIULIANO G. (a) |
| Text | 42153 2007 10.1007/s10040 007 0169 x ISI Web of Science WOS 000249303600012 OCCURRENCE OF MINOR TOXIC ELEMENTS IN VOLCANIC SEDIMENTARY AQUIFERS A CASE STUDY IN CENTRAL ITALY VIVONA R. a ; PREZIOSI E. A ; MADÉ B. b ; GIULIANO G. a a IRSA CNR Water Research Institute, Via Reno, 1 00198 Rome, Italy; b Ecole des Mines de Paris, Centre de Geosciences UMR CNRS Sisyphe, 35, rue St Honore, 77305 Fontainebleau, France The occurrence of minor toxic elements arsenic, vanadium and fluoride among others in the volcanic aquifers of central Italy, with concentrations often above the national standards for drinking waters, has been recognized since the 1970s. However, these groundwaters are still often used for human consumption. With the aim of providing insight into the water rock interaction processes, as well as into the evolution of arsenic and other elements, water sampling campaigns where undertaken within a 100 km 2 area at the eastern margin of the Viterbo region, where volcanites overlie an alluvial aquifer complex. The samples were analysed and geochemical modelling was applied to characterize the thermodynamic state of the waters. The results indicate the existence of direct relations among arsenic, vanadium and fluoride concentrations and of their inverse relationship with calcium concentration. An evolution scheme of groundwater composition from the upstream volcanic aquifer to the downstream sedimentary aquifer is also discussed. Two hypotheses are proposed which justify the observed decrease of the cited minor element concentrations, i.e. dilution processes and/or precipitation of fluorapatite, which can include in its structure small amounts of these elements. The precipitation hypothesis is supported by modelling results. 15 Published paper 2007_Vivona_Preziosi_Made_Giuliano_Hydrogeol_J.pdf Articolo in rivista Springer 1431 2174 Hydrogeology journal Hydrogeology journal Hydrogeol. j. Hydrogeology journal. Hydrogeology journal Print VIVONA RAFFAELLA GIULIANO GIUSEPPE GENNARO elisabetta.preziosi PREZIOSI ELISABETTA TA.P02.009.002 Effetti dei cambiamenti climatici sulla componente terrestre del ciclo idrologico |