Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | An evaluation of trace metals in high altitude lakes of the Central Alps: present levels, origins and possible speciation in relation to pH values |
| Abstract | Alpine areas in north-western Italy are subject to high deposition of atmospheric pollutants. Chemical investigations on high-altitude lakes indicate that most of them are recovering from acidification; however, they are still affected by the deposition of pollutants from the atmosphere, especially of heavy metals. This study compares the concentrations of heavy metals in alpine lake waters with those found in atmospheric depositions, to identify the possible contribution of deposition inputs to surface water ecosystems. The results were analysed by multivariate statistical techniques to identify the main emission sources of the various metals. Levels of trace metals in alpine lakes are generally low, and bedrock and surficial geology proved to be a major factor controlling metal concentrations in lake water. In fact, terrigenous elements show a wide range of concentrations while metals of anthropogenic origin, such as lead and cadmium, are often below the detection limits of the method; chrome and nickel are also present in very low concentrations. The median values of heavy metals in Italian alpine lakes are similar to those found in other lake surveys performed in remote areas, especially as regards metals of anthropogenic origin. The Visual MINTEQ model was applied to long-term chemical data of selected alpine lakes, to calculate aluminium speciation and to simulate its change in response to gradual modifications in a unit of pH. The ultimate aim of the modelling was to evaluate the possible threat to aquatic organisms of these highly toxic compounds |
| Source | Water, air and soil pollution (Print) 223, pp. 1895–1909 |
| Keywords | Heavy metalsAlpine lakesAluminiumAtmospheric depositionsAcidification |
| Journal | Water, air and soil pollution (Print) |
| Editor | Kluwer Academic Publishers, Dordrecht, Paesi Bassi |
| Year | 2012 |
| Type | Articolo in rivista |
| DOI | 10.1007/s11270-011-0993-4 |
| Authors | Ombretta Tornimbeni; Michela Rogora |
| Text | 215469 2012 10.1007/s11270 011 0993 4 Heavy metals Alpine lakes Aluminium Atmospheric depositions Acidification An evaluation of trace metals in high altitude lakes of the Central Alps present levels, origins and possible speciation in relation to pH values Ombretta Tornimbeni; Michela Rogora CNR Istituto per lo Studio degli Ecosistemi, I 28922 Verbania Pallanza Alpine areas in north western Italy are subject to high deposition of atmospheric pollutants. Chemical investigations on high altitude lakes indicate that most of them are recovering from acidification; however, they are still affected by the deposition of pollutants from the atmosphere, especially of heavy metals. This study compares the concentrations of heavy metals in alpine lake waters with those found in atmospheric depositions, to identify the possible contribution of deposition inputs to surface water ecosystems. The results were analysed by multivariate statistical techniques to identify the main emission sources of the various metals. Levels of trace metals in alpine lakes are generally low, and bedrock and surficial geology proved to be a major factor controlling metal concentrations in lake water. In fact, terrigenous elements show a wide range of concentrations while metals of anthropogenic origin, such as lead and cadmium, are often below the detection limits of the method; chrome and nickel are also present in very low concentrations. The median values of heavy metals in Italian alpine lakes are similar to those found in other lake surveys performed in remote areas, especially as regards metals of anthropogenic origin. The Visual MINTEQ model was applied to long term chemical data of selected alpine lakes, to calculate aluminium speciation and to simulate its change in response to gradual modifications in a unit of pH. The ultimate aim of the modelling was to evaluate the possible threat to aquatic organisms of these highly toxic compounds 223 Published version Tornimbeni Rogora WASP 2012 Tornimbeni_Rogora_articolo_WASP_2012.pdf Articolo in rivista Kluwer Academic Publishers 0049 6979 Water, air and soil pollution Print Water, air and soil pollution Print Water, air and soil pollution. Print Water air soil pollut. Print Water, air soil pollution Print TORNIMBENI OMBRETTA michela.rogora ROGORA MICHELA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |