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Trace element contamination in the arms of the Danube Delta (Romania/Ukraine): Current state of knowledge and future needs

Vignati, Davide A.L. and Secrieru, Dan and Bogatova, Yuliya I. and Dominik, Janusz and Céréghino, Régis and Berlinsky, Nikolai A. and Oaie, Gheorghe and Szobotka, Stefan and Stanica, Adrian Trace element contamination in the arms of the Danube Delta (Romania/Ukraine): Current state of knowledge and future needs. (2013) Journal of Environmental Management, 125. 169-178. ISSN 0301-4797

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Official URL: http://dx.doi.org/10.1016/j.jenvman.2013.04.007

Abstract

This paper provides the first critical synopsis of contamination by selected trace elements in the whole Danube Delta (Romania/Ukraine) to: identify general patterns of contamination by trace elements across the Delta, provide recommendations to refine existing monitoring networks and discuss the potential toxicity of trace elements in the whole Delta. Sediment samples were collected between 2004 and 2007 in the three main branches of the Delta (Chilia, Sulina and Sfantu Gheorghe) and in the secondary delta of the Chilia branch. Samples were analyzed for trace elements (Cd, Co, Cr, Cu, Ni, Pb, V, and Zn) and TiO2, Fe2O3, MnO, CaCO3 and total organic carbon. Cluster analysis (CA) and Principal Component Analysis (PCA) showed that levels of Cd, Cu, Pb, and Zn were influenced by anthropogenic activities. At the opposite, concentrations of Cr and Ni largely originated from the weathering of rocks located in the Romanian part of the Danube catchment and naturally rich in these elements. Data analysis using Self- Organizing Maps confirmed the conclusions of CA/PCA and further detected that the contamination tended to be higher in the Chilia and Sulina arms than in the Sfantu Gheorghe arm. The potential ecological risks due to trace element contamination in the Danube Delta could be identified as moderate and localized, provided that the presence of the natural sources of Cr and Ni was properly considered. The available results suggest that monitoring sediment quality at the mouths of Sulina and Sfantu Gheorghe arms is probably enough to get a picture of the sediment quality along their entire lengths. However, a larger network of monitoring points is necessary in the Chilia and secondary Chilia delta to account for the presence of local point sources and for the more complex hydrodynamic of this part of the Danube Delta.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Journal of Environmental Management website : http://www.sciencedirect.com/science/journal/03014797
HAL Id:hal-00908616
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Consiglio Nazionale delle Ricerche - CNR (ITALY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Genève (SWITZERLAND)
Other partners > National Institute of Marine Geology and geoecology - GeoEcomar (ROMANIA)
Other partners > Istituto di Science Marine - ISMAR (ITALY)
Other partners > Research Center (RC) Noosphera (UKRAINE)
Other partners > Université de Lorraine (FRANCE)
Laboratory name:
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Deposited By: Régis Cereghino
Deposited On:25 Nov 2013 09:01

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