LUMINITA-FLORENTINA DEACONU (STANESCU)<br>Characterization of Heavy Metals Distribution at the Level <br>of Biotic Compartments of the Dambovnic River

LUMINITA-FLORENTINA DEACONU (STANESCU)
Characterization of Heavy Metals Distribution at the Level
of Biotic Compartments of the Dambovnic River

Abstract:

Dâmbovnic River, a tributary of the Neajlov River, has undergone over time al different loads of heavy metals (Cr, Cd, Pb, Mn) from industrial wastewater discharges from nearby settlements. Another source of pollution is the significant quantities of heavy metals that are carried downstream when stronger spills cause resuspension of bottom sediments of upstream lakes. It is known that the highest concentrations of heavy metals in river are found in the bottom sediments. (See also previous article), but the fate of these metals and the impact on the ecosystem are still unknown. The main purpose of this paper is to clarify as much as possible, the impact of heavy metals such as Cr, Cd, Mn have both on submerged and anchored vegetation and on benthic macroinvertebrates in the Dâmbovnic catchment. According to the analyzed results submerged/floating species (Cladophora and Lemna minor) presents a Cd bioconcentration factor greater than one, much larger than the anchored species (where Fbc[1), suggesting the potential they have in terms of phytoremediation techniques of aquatic systems which capture industrial effluents with high concentrations of metals. The transfer of chromium from the lower to the upper parts of the Typha, Juncus and Potamogeton is less (Typha sp 0.06 - 0.25; Juncus sp. 0.05-0.09), indicating that, in the event of Cr contamination of aquatic sites, risk transfer of this to primary consumers is reduced. For benthic macroinvertebrates Cr concentration factors are below par, showing that the metal does not focus on the benthic macroinvertebrates, the main compartment that stores this metal is the sediment. For Mn, the dynamics spatial of averages, seasonal of tissue concentrations of benthic macroinvertebrates is characterized by highest values at station D4, for all taxonomic groups which were analyzed. Keywords: heavy metals, vegetation, benthic macroinvertebrates, Dâmbovnic River

Issue: 2014, Volume 65, Issue 9

Pages:

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