1,720,966 research outputs found
Contamination by chlorinated hydrocarbons (DDT, PCBs), in surface sediment and macrobenthos of the river Adige (Italy)
No full textSurface sediments and macrobenthos communities have been employed as contamination indicators for halogenated hydrocarbons (DDT and PCBs) in the river Adige and its tributaries Fibbio and Alpone in the province of Verona. Two sampling campaigns were carried out, before and after the spring-summer floods, to determine the effects of this event on the contamination of the river. The halocarbons in the sediment were found to be associated with the fine fraction (< 53 μm) and organic carbon. From the relative concentrations of contaminants determined at various sampling stations, some information has been obtained on the sources. © 1987
Macroinvertebrate communities and sediments as contamination indicators for heavy metals in the river Adige (Italy)
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Combined preparative and analytical use of normal-phase and reversed- phase high-performance liquid chromatography for the determination of aliphatic and polycyclic aromatic hydrocarbons in sediments of the Adriatic sea
No full textHigh-performance liquid chromatography (HPLC) has been used for the preparative separation of environmentally relevant aliphatic and polycyclic aromatic hydrocarbons (PAHs), and for quantifying PAHs. Normal-phase HPLC was employed as a fractionation step, whereas the quantitative determination of the PAHs was accomplished by using reversed-phase HPLC. In both cases, GC and GC/MS were used as confirmatory techniques. The concentrations of twelve unsubstituted PAHs in sixteen surface and deeper sediments, taken from the northern and central Adriatic Sea, are reported, together with an evaluation of their dependence upon the percentages of fine material and total organic carbon. © 1986
Radiometric dating and pollutant profiles in a sediment core from the lagoon of Venice
No full textThe super(210)Pb radioactive dating technique on two cores from the northern part of the Lagoon of Venice gives an average sedimentation rate of 0.7 cm/year. This is used to date the vertical profiles of member of DDT, Hg, Cd, Pb, Cr, Cu, Ni, Co, Zn and Fe concentrations. A maximum member of DDT concentration is found at a depth of 10 cm, corresponding to about 1955, in accordance with the time of the largest use of this pesticide in the area drained by the Dese river. Due to antropogenic origin the concentrations of heavy metals in the upper sediment layers are 1.3-12.7 times higher than those in the lower ones. The average concenttrations of these elements in the layers below 80 cm are tentatively proposed as natural background concentrations for the Lagoon of Venice
Comparison of two analytical methods for the determination of Cu, Co, Ni, Cd, Pb, Zn, Fe, and Cr in marine sediments
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Heavy metal content and lithological properties of recent sediments in the northern Adriatic
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DDT and PCBs in sediments of the Venice gulf
No full textThe concentrations of DDT and PCBs in surface sediments collected in the Gulf of Venice are reported. The contribution of the lagoon and of the rivers to sea sediment contamination is discussed. Fresh waters reaching the sea through the lagoon or directly from rivers are responsible for relatively high ?DDT concentrations. The Porto Marghera industrial zone located in the inner border of the lagoon is probably the main PCB source. Two transport mechanisms have been identified: mobilization of suspended solids by tidal movements and direct dumping of industrial tailing and/or dredged materials from the lagoon canals. © 1983 Taylor & Francis Group, LLC
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