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| Muresan, Bogdan; Pernet-coudrier, Benoit; Cossa, Daniel; Varrault, Gilles. |
| Dissolved organic matter (DOM) samples were obtained from a low-density urbanized area located upstream of Paris (along the Marne River, France) and from the treated effluents at the Paris main wastewater treatment plant. These samples were then fractionated according to their hydrophobicity. DOM fractions consisted of nanomolar to sub-micromolar fresh organic substances with extremely strong Hg-complexing ligands. The conditional stability constants (i.e. K(HgL)'; pH similar to 6.8, I(NaCl) = 0.5 M, T = 25 degrees C) of the Hg-DOM complexes formed were greater than 10(24) M (1), for the reaction Hg(2+) + L = HgL (with L as ligand). For upstream of Paris, thermodynamic calculations indicated that the vast majority of Hg-DOM was associated with hydrophobic... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00060/17108/14717.pdf |
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