1,720,996 research outputs found
Tenori del piombo disciolto e rapporti isotopici 206Pb/207Pb nelle acque piovane della Sardegna
No full textMetalli in tracce nelle piogge della Sardegna meridionale (Al, Si, Fe, Co, Ba, Rb, Mn, Sr, V, Ni, Zn, Cu, Cd, Pb)
No full textPreliminary results on the occurrence of rare earth elements in the water system of the Pialassa Baiona, Ravenna
No full textThe Site of Community Importance of the Pineta S. Vitale, bordered by the
Pialassa Baiona lagoon system, is submitted to increasing deterioration due to a subsiding phenomenon, groundwater salinization and contamination from the
industrial sites of Ravenna. Within a multidisciplinary research project, evaluation
of the background level of Rare Earth Elements (REE, not regulated at present, but
potentially harmful to human health) and the characterization of processes which
control their migration and retention were performed to contribute to the
knowledge on the present environmental quality of the Ravenna area.
Concentrations of total and dissolved elements were determined in 40 water
samples comprising surface waters, soil waters, shallow and deep groundwater.
Dissolved major and minor components generally showed increasing
concentrations from West to East (i.e. towards the sea) and appeared mostly
derived from a marine source. Marked correlations between dissolved ΣREE and
Al and Fe concentrations in the filtered fraction <0.4 μm were observed, especially
in the soil waters. Shale-normalized patterns of the dissolved REE in the soil
waters showed an enrichment in the Middle REE (MREE); such patterns being
attributed to preferential adsorption of the MREE onto colloidal particles (<0.4
μm)
Acid drainage from sulphides hosting gold mineralization (Furtei, Sardinia)
No full textThe past mining activity for kaolin minerals left several abandoned quarries in the area of Furtei (southern Sardinia). Recently, gold mineralization has been found in association with intensely altered andesitic rocks, and an open-pit gold mine is expected to open in the near future. Twenty-one water samples were analyzed for a wide range of major and trace elements, in order to define the present hydrochemical situation before exploitation starts. Waters interacting with the altered andesitic rocks had higher salinity and metal concentrations than waters in contact with nonaltered rocks. Acid drainage and high concentrations of metals (Al, Fe, Mn, Zn, Cu, As) in solution were observed in waters leaching the mineral deposit. An environmental impact study is urgently called for since the waste material derived from the exploitation is expected to enhance acidification and metal-releasing processes, due to the increase in the specific yield, which favors the oxidation of sufide minerals
Environmental mineralogy and geochemistry of the abandoned Pb-Zn Montevecchio-Ingurtosu mining district, Sardinia, Italy
No full textThe Montevecchio-Ingurtosu mining district has been a major source of Pb and Zn since roman times and now contains approximately three million cubic metres of tailings with up to a few percent of Pb and Zn, several hundred ppm Cd and Cu, plus minor amounts of other metals. Since the cessation of all mining activities, these abandoned waste piles pose serious threats to the environment because they release toxic elements; waters draining the area are significantly polluted by Zn and Cd, and locally by Pb and Ni
Distinzione della componente marina e continentale nelle precipitazioni piovose dell'area forestale di Pixina Manna (Sardegna Sud-Occidentale)
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Influence of Saharian dust and marine spray on the chemical composition of rain in Sardinia, Italy
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Geochemistry of spring and well waters and mineralogy of the interacting Oligo-Miocene volcanic rocks in the Logudoro region (NW Sardinia, Italy)
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