Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana)
International audience Formation of dissolved gaseous mercury (DGM) and its volatilization from aquatic systems can be considered as a natural attenuation process, which limits the methylation of mercury (Hg) and Hg accumulation in fish. Although gold-mining activity and erosion of tropical soils le...
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ftunigrenoble:oai:HAL:insu-00269179v1 2024-04-28T08:09:32+00:00 Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) Peretyazhko, T. Charlet, Laurent Muresan, B. Kazimirov, V. Cossa, D. Laboratoire de Géophysique Interne et Tectonophysique (LGIT) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Central des Ponts et Chaussées (LCPC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) Unité Biogéochimie et Ecotoxicologie (BE) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Department of Chemistry Kyiv Taras Shevchenko National University of Kyiv 2006 https://insu.hal.science/insu-00269179 https://doi.org/10.1016/j.scitotenv.2005.06.016 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2005.06.016 insu-00269179 https://insu.hal.science/insu-00269179 doi:10.1016/j.scitotenv.2005.06.016 ISSN: 0048-9697 EISSN: 1879-1026 Science of the Total Environment https://insu.hal.science/insu-00269179 Science of the Total Environment, 2006, 364 (1-3), pp.260-271. ⟨10.1016/j.scitotenv.2005.06.016⟩ Dissolved gaseous mercury DGM Petit-Saut reservoir Reduction info:eu-repo/semantics/article Journal articles 2006 ftunigrenoble https://doi.org/10.1016/j.scitotenv.2005.06.016 2024-04-18T03:31:56Z International audience Formation of dissolved gaseous mercury (DGM) and its volatilization from aquatic systems can be considered as a natural attenuation process, which limits the methylation of mercury (Hg) and Hg accumulation in fish. Although gold-mining activity and erosion of tropical soils lead to increased Hg concentration in aquatic systems, little is known about DGM production and distribution in tropical aqueous systems. Our work explores the vertical distribution and principal sources of DGM in a meromictic Amazonian reservoir. Dissolved gaseous mercury measurements carried out in Petit-Saut reservoir (French Guiana, South America) revealed DGM increase in the surface waters and at the bottom layers of the reservoir during the dry season. As in arctic and temperate lakes, high DGM concentrations in surface waters were attributed to sunlight-mediated photochemical processes. Dissolved gaseous mercury concentrations in the anaerobic hypolimnion were larger than in temperate or arctic lakes. In order to elucidate Hg(II) reduction pathways in the bottom layer of tropical reservoir, laboratory Hg(II) reduction experiments were performed with anoxic aqueous suspensions of surface sediments either untreated or treated by γ-ray and NaN3. Our results indicated that DGM production at the bottom layer of Petit-Saut reservoir was biologically mediated. Dissolved gaseous mercury formation rates in the surface sediment suspensions were of the same order of magnitude as formation rates in freshwater lakes reported in literature. Article in Journal/Newspaper Arctic Université Grenoble Alpes: HAL Science of The Total Environment 364 1-3 260 271 |
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Open Polar |
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Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
Dissolved gaseous mercury DGM Petit-Saut reservoir Reduction |
spellingShingle |
Dissolved gaseous mercury DGM Petit-Saut reservoir Reduction Peretyazhko, T. Charlet, Laurent Muresan, B. Kazimirov, V. Cossa, D. Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) |
topic_facet |
Dissolved gaseous mercury DGM Petit-Saut reservoir Reduction |
description |
International audience Formation of dissolved gaseous mercury (DGM) and its volatilization from aquatic systems can be considered as a natural attenuation process, which limits the methylation of mercury (Hg) and Hg accumulation in fish. Although gold-mining activity and erosion of tropical soils lead to increased Hg concentration in aquatic systems, little is known about DGM production and distribution in tropical aqueous systems. Our work explores the vertical distribution and principal sources of DGM in a meromictic Amazonian reservoir. Dissolved gaseous mercury measurements carried out in Petit-Saut reservoir (French Guiana, South America) revealed DGM increase in the surface waters and at the bottom layers of the reservoir during the dry season. As in arctic and temperate lakes, high DGM concentrations in surface waters were attributed to sunlight-mediated photochemical processes. Dissolved gaseous mercury concentrations in the anaerobic hypolimnion were larger than in temperate or arctic lakes. In order to elucidate Hg(II) reduction pathways in the bottom layer of tropical reservoir, laboratory Hg(II) reduction experiments were performed with anoxic aqueous suspensions of surface sediments either untreated or treated by γ-ray and NaN3. Our results indicated that DGM production at the bottom layer of Petit-Saut reservoir was biologically mediated. Dissolved gaseous mercury formation rates in the surface sediment suspensions were of the same order of magnitude as formation rates in freshwater lakes reported in literature. |
author2 |
Laboratoire de Géophysique Interne et Tectonophysique (LGIT) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Central des Ponts et Chaussées (LCPC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) Unité Biogéochimie et Ecotoxicologie (BE) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Department of Chemistry Kyiv Taras Shevchenko National University of Kyiv |
format |
Article in Journal/Newspaper |
author |
Peretyazhko, T. Charlet, Laurent Muresan, B. Kazimirov, V. Cossa, D. |
author_facet |
Peretyazhko, T. Charlet, Laurent Muresan, B. Kazimirov, V. Cossa, D. |
author_sort |
Peretyazhko, T. |
title |
Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) |
title_short |
Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) |
title_full |
Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) |
title_fullStr |
Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) |
title_full_unstemmed |
Formation of dissolved gaseous mercury in a tropical lake (Petit-Saut reservoir, French Guiana) |
title_sort |
formation of dissolved gaseous mercury in a tropical lake (petit-saut reservoir, french guiana) |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://insu.hal.science/insu-00269179 https://doi.org/10.1016/j.scitotenv.2005.06.016 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0048-9697 EISSN: 1879-1026 Science of the Total Environment https://insu.hal.science/insu-00269179 Science of the Total Environment, 2006, 364 (1-3), pp.260-271. ⟨10.1016/j.scitotenv.2005.06.016⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2005.06.016 insu-00269179 https://insu.hal.science/insu-00269179 doi:10.1016/j.scitotenv.2005.06.016 |
op_doi |
https://doi.org/10.1016/j.scitotenv.2005.06.016 |
container_title |
Science of The Total Environment |
container_volume |
364 |
container_issue |
1-3 |
container_start_page |
260 |
op_container_end_page |
271 |
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1797577859826450432 |