| Type |
Article |
| Date |
2011-12 |
| Language |
English |
| Author(s) |
Muresan Bogdan1, Pernet-Coudrier Benoit1, Cossa Daniel2, Varrault Gilles1 |
| Affiliation(s) |
1 : Univ Paris Est Creteil, UMR MA 102, LEESU, AgroParisTech, F-94010 Creteil, France.
2 : IFREMER, Ctr Mediterranee, Lab Biogeochim Contaminants Metall, F-83507 La Seyne Sur Mer, France. |
| Source |
Applied Geochemistry (0883-2927) (Pergamon-elsevier Science Ltd), 2011-12 , Vol. 26 , N. 12 , P. 2057-2063 |
| DOI |
10.1016/j.apgeochem.2011.07.003 |
| WOS© Times Cited |
15 |
| Abstract |
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 DOM. In contrast, in the Paris main wastewater treatment plant effluents, Hg-DOM was mainly bound to hydrophilic DOM. Simple dilution calculations highlighted that due to the large DOM loading of urban discharges, the hydrophilic urban DOM ligands may commonly dominate Hg-DOM speciation in the downstream Seine River, except under extreme dilution (i.e. high water episodes or floods). (C) 2011 Elsevier Ltd. All rights reserved. |
| Full Text |
| File |
Pages |
Size |
Access |
|
7 |
260 KB |
Access on demand |
| Author's final draft |
17 |
410 KB |
Open access |
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