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  • 1
    Electronic Resource
    Electronic Resource
    Submitochondrial particles asin vitro biosensors of heavy metal toxicity (1996)
    Springer
    Journal of aquatic ecosystem stress and recovery 5 (1996), S. 125-134 
    Details
    ISSN: 1573-5141
    Keywords: mitochondria ; reverse electron transfer ; aquatic toxicology ; screening test ; metal toxicity assessment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects on mitochondrial respiratory parameters of heavy metals, such as Cu, Ni, Pb, Cd, Zn, Ag, Hg, were recorded by using thein vitro response of submitochondrial particles (SMP) from beef heart mitochondria. The toxicity of these elements was estimated by determining their effects on the energy-coupled reverse electron transfer (RET), which is induced by ATP and succinate at first site level of the respiratory chain in SMP. The RET rate was easily monitored by recording spectrophotometrically at 340 nm the production of NADH, arising from the reduction of exogenous NAD+ by RET. The toxicity values were expressed as the toxicant molar concentration which decreases the rate of reduction of NAD+ to an extent of 50 percent (EC50). The toxicity increased in the following order: Ni2+〈Pb2+〈Zn2+〈 Cd2+〈Hg2+〈Cu2+〈Ag+. The SMP data were compared with the toxicity values obtained from a variety of biological systems currently used for toxicity testing. The results obtained demonstrate that the SMP test generally provides a good estimate of metal toxicity for several fish and invertebrate species. This is demonstrated by the statistical parameters obtained in the regression analysis. The broadened 95% confidence intervals and, in particular, the poor correlations obtained for some aquatic organisms can be ascribed to the more complex metabolic interactions and competing toxic pathways in aquatic organisms, when compared to SMP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662801
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pollutant Exchange at the Water/Sediment Interface in the Venice Canals (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 255-263 
    Details
    ISSN: 1573-2932
    Keywords: heavy metals ; sediments ; pollution ; resuspension ; release processes ; bioavailability ; anthropogenic metal ; residual metal ; geochemical phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The space-time distribution of some pollutants (Cu, Pb, Zn, Cd, Fe, Mn, V, Ni, Cr) in the sludge of the canals of Venice was studied. The contamination levels were comparable to, or higher, than those measured in the most polluted sediments of the Lagoon of Venice. Sediments were collected by two different sampling techniques: 1) collection of sediment cores (upper 5 cm) by a syringe-type corer; 2) collection by traps, placed on the bottom of the canal. Traps permitted the sampling of sediments essentially resuspended by overlying water turbulence. This sediment fraction is subjected to variations of its physicochemical parameters (principally change of redox conditions) and therefore to pollutant exchange at the water/sediment interface. The metals principally exchanged during sediment resuspension were Cd, Pb, Zn and Cu. These metals have principally an anthropogenic origin and are bound to the most labile geochemical phases of the sediment (such as sulphides), which can be oxidised during sediment resuspension, releasing metals into the water. Fe, Cr and Ni were only partially exchanged, while Mn and V were generally not exchanged; a significant fraction of these metals is of natural origin and is bound to the most refractory phases of the sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018329726495
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pollutant exchange at the water/sediment interface in the venice canals (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 255-263 
    Details
    ISSN: 1573-2932
    Keywords: heavy metals ; sediments ; pollution ; resuspension ; release processes ; bioavailability ; anthropogenic ; metal ; residual inetal ; geochemical phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The space-time distribution of some pollutants (Cu, Ph, Zn, Cd, Fe, Mn, V, Ni, Cr) in the sludge of the canals of Venice was studied. The contamination levels were comparable to, or higher, than those measured in the most polluted sediments of the Lagoon of Venice Sediments were collected by two different sampling techniques I ) collection of sediment cores (upper 5 cm) by a syringe-type corer, 2) collection by traps, placed on the bottom of the canal Traps pennitted the sampling of sediments essentially resuspended by overlying water turbulence This sediment fraction is subjected to variations of its physicochemical parameters (principally change of redox conditions) and therefore to pollutant exchange at the water/sediment interface The metals principally exchanged during sediment resuspension were Cd, Pb, Zn and Cu These metals have principally an anthropogenic origin and are bound to the most labile geochemical phases of the sediment (such as sulphides), which can be oxidised during sediment resuspension, releasing metals into the water Fe, Cr and Ni were only partially exchanged, while Mn and V were generally not exchanged, a significant fraction of these metals is of natural origin and is bound to the most refractory phases of the sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406865
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Useful tracer parameters to investigate the environmental conditions in areas of the Venice Lagoon (1995)
    Springer
    Wetlands ecology and management 3 (1995), S. 139-147 
    Details
    ISSN: 1572-9834
    Keywords: environmental tracer ; grain size ; redox potential ; shallow water ; Venice Lagoon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grain-size and redox potential distributions in sediments were used as tracers to investigate environmental conditions in a shallow water area of the Venice Lagoon subjected to summer anoxic events. Data are presented showing different environmental characteristics within the study area. The results illustrate the reliability of these tracers to acquire a preliminary knowledge of the aquatic ecosystem behavior. Even small differences in morphology and hydrodynamics are observable because of the marked influence they exert on sediment parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180021
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    Paper (German National Licenses)
    Fulltext
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