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Transfert de métaux entre eau et suspensions dans les estuaires

Abstract : The fate of trace metals in estuarine and coastal areas is largely controlled by their distribution between water and suspended particles which generally have much higher residence times or eventually can be definitely deposited in these areas. The aim of this study is to better understand metals transfer between dissolved and particulate phases in estuaries. Water collected in five estuaries (Rhone, Ebro, Scheldt, Lena and Changjiang) was spiked with various radionuclides (109Cd, 134Cs, 65Zn, 54Mn and 60Co), and distribution coefficients (FDC) were measured after few hours of incubation time. The use of surface complexation models to interpret FDC measurements allowed to analyze the principal exchange processes of the selected metals in estuaries. These results could be used in the study of the transfer of metals in other aquatic systems. Colloids and dissolved organic ligands take a prominent par in metals transfer between particulate and dissolved phases. On the one hand, we showed that colloids and dissolved organic matter sorbed at the water/particle interface change the particle surface characteristics and reactivity to metals. On the other hand, we showed that metal complexation by colloids and dissolved organic ligands is very important. However the composition of these species is unknown.
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Submitted on : Monday, March 7, 2011 - 9:45:48 AM
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Khaled Sioud. Transfert de métaux entre eau et suspensions dans les estuaires. Hydrologie. Ecole nationale des ponts et chaussées - ENPC PARIS / MARNE LA VALLEE, 1994. Français. ⟨pastel-00574027⟩

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