1,720,978 research outputs found
Baseline on rare earth elements in the marine sediments of a Mediterranean commercial port as environmental tracers and their relationships with inorganic contaminants
No full textThe Port of Genoa (north-western Mediterranean Sea) receives sediments from two different catchment areas
(Bisagno and Polcevera torrents). The aim of the work is to evaluate if Rare Earth Elements (REEs) could be used to identify the two sedimentary inputs and to unravel the origin of inorganic contaminants in an anthropised basin. REE results constitute a baseline for this port. The main REE-bearing minerals are phosphates and zircon. As, Cd, Hg, Pb, and Sn concentrate in the sediments closer to the Bisagno Torrent mouth, and the correlation with Ca and Light-REEs suggests their plausible geological origin. Co, Mn, and Ni maxima lie in the sediments closer to the Polcevera Torrent. Their correlation with Middle-REEs and Mg suggest that ophiolitic rocks could explain their presence. Cr, Cu, V, and Zn do not show a clear correlation with REEs, and their origin probably is a combination of natural and anthropogenic sources
Identification of the different sources of contaminants in the metal impacted Gromolo Torrent and related marine sediments
No full textColloidal precipitates related to AMD settings: a combined HT-XRD and bulk leaching test approach.
No full textAssessment of metal distribution in different Fe precipitates related to Acid Mine Drainage through two sequential extraction procedures
No full textIn the last decades, the contamination by metals from mining areas, especially that due to Acid Mine Drainage (AMD), has become a hot topic for the scientific community. The precipitation of secondary minerals related to AMD is the most important natural method of scavenging elements from such solutions. These minerals are a dynamic system, in which mineralogical and chemical transformations could be triggered by sudden changes of the chemical-physical conditions. Therefore, minerals related to AMD could merely act as temporary sink for inorganic pollutants, and understanding the stability over time of metals in these phases is very important. This paper aims to evaluate metal lability in 4 different natural precipitates related to AMD by using two different sequential extraction procedures. Two samples were composed of goethite and jarosite, one sample of schwertmannite, and the last sample of an amorphous Fe phase. The results obtained allowed concluding that the amorphous Fe phase was able to scavenge a high amount of metals from the flowing solutions, but it was also the most reactive compound. Therefore, this phase represented a major threat for the environment. The results obtained showed that the two sequential extraction procedures were not able to dissolve completely the Fe phases, probably because the sample-extractant volume ratio and the time and nature of contact was not optimised for this kind of samples. For this reason, the results of sequential extraction procedures on AMD impacted materials could be unreliable in case of Fe oxyhydroxide very rich samples
New materials for environmental remediation: synthesis and characterization of LDH’s REE–doped (REE= Rare Earths Element) for lanthanides recovery from waste
No full textTemperature-induced phase transition and remobilization of potential ecotoxic elements (PTE) in AMD colloidal precipitates.
No full textEnvironmental pollution in river and marine sediments: the case of Gromolo Torrent (Liguria, Italy)
No full textPTE (Potential ecotoxic Element) mobility in stream and marine sediments: the case of Gromolo Torrent (eastern Liguria, Italy.
No full textMicroplastic characterisation in fluvial and marine sediments: the case of the Gulf of Tigullio (north-western Italy).
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