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Data/hora: 12/06/2024 14:15:07

The biogeochemistry of mercury at the sediment water interface in the Thau lagoon. 1. Partition and speciation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Muresan Paslaru, Bogdan; Cossa, Daniel; Jezequel, D; Prevot, F; Kerbellec, S.
Solid sediment, pore and epibenthic waters were collected from the Thau lagoon (France) in order to study the post depositional partition and mobility of mercury and monomethylmercury in an organic rich sediment. Total Hg (HgT) and monomethymercury (MMHg) profiles were produced in both dissolved and solid phases. The distribution of HgT in the solid appeared to be related to the historical changes in the Hg inputs into the lagoon. HgT was in equilibrium between solid and solution in the sulfidic part of the cores, with a mean log Kd of 4.9 +- 0.2. The solid appeared to be a source of HgT for pore water in the upper oxic to suboxic parts of the cores. The MMHg represented a small fraction of HgT: 3-15 % and 0.02-0.80 % in the dissolved and in the solid...
Tipo: Text
Palavras-chave: Fluxes; Partition; Sediment; Lagoon; Methylmercury; Mercury.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2006/publication-2083.pdf

Biogeochemical and contaminant cycling in sediments from a human-impacted coastal lagoon - Introduction and summary
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Rabouille, Christophe; Amouroux, D; Anschutz, P; Jouanneau, J.-m.; Gilbert, F; Cossa, Daniel; Prevot, F.
A general decrease in the anthropogenic pressure on coastal ecosystems has been observed recently in developed countries. But coastal lagoon ecosystems are still undergoing major human impact (Lotze et al., 2006). A major environmental concern is the enhancement of contaminant dispersion and algal production due to eutrophication, associated with an increase in the duration of intermittent seasonal periods of anoxia. Due to past industrial activity, large concentrations of contaminants have been accumulated in sediments of natural water bodies. One of the issues raised by environmentalists is the fate of these contaminants with changing environmental conditions, such as restoration of water bodies to their "pristine" state (water framework directives), or...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3037.pdf