Speciation of trace metals in organic matter of contaminated urban sediments

Amelène El Mufleh (1) , Béatrice Bechet (1) , Laurent Grasset (2) , Claude Geffroy Rodier (2) , Véronique Ruban (1) , André Ambles (3)

1 LCPC/GER - Département Géotechnique, Eau et Risques
2 Chimie des produits naturels et de l'environnement
3 IC2MP [Poitiers] - Institut de chimie des milieux et matériaux de Poitiers [UMR 7285]

A methodology based on the coupling of chemical methods (methyl isobu-tyl ketone (MIBK) and IHSS fractionations) and physical characterization methods (XRD and SEM) was applied to study the relevance of these two fractionation methods on the speciation of trace metals in organic matter of three stormwater sediments. Trace metals distribution among MIBK and IHSS fractions is very different. Except for Cr, 10 to 30% of trace metals are bonded to MIBK-humin fractions, whereas 70 to 100% are bonded to IHSS-humin fraction. Moreover, Cd, Cr, Ni and Zn are strongly bonded to the highly aggregated fraction.

Mots clés: METAUX LOURDS; BASSIN VERSANT

Domaines: Ecologie, Environnement

Amelène El Mufleh, Béatrice Bechet, Laurent Grasset, Claude Geffroy Rodier, Véronique Ruban, et al.. Speciation of trace metals in organic matter of contaminated urban sediments. The 10th Urban Environment Symposium, Jun 2010, Gothenburg, Sweden. pp 361-372. ⟨hal-00907351⟩