Dynamics of mercury species in surface sediments of a macrotidal estuarine–coastal system (Adour River, Bay of Biscay)

Estuarine and coastal surface sediments from the Adour estuary and adjacent coastal area (South Bay of Biscay) have been investigated to establish mercury species variability in a macrotidal system submitted to contrasted seasonal river discharges and downstream urbanisation. Surface sediments were...

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Veröffentlicht in:	Estuarine, coastal and shelf science coastal and shelf science, 2004-03, Vol.59 (3), p.511-521
Hauptverfasser:	Stoichev, T, Amouroux, D, Wasserman, J.C, Point, D, De Diego, A, Bareille, G, Donard, O.F.X
Format:	Artikel
Sprache:	eng
Schlagworte:	Adour estuary Analytical chemistry Animal and plant ecology Animal, plant and microbial ecology Bay of Biscay biogeochemistry Biological and medical sciences Brackish Brackish water ecosystems Chemical Sciences Fundamental and applied biological sciences. Psychology mercury methylmercury sediment Synecology
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creator	Stoichev, T Amouroux, D Wasserman, J.C Point, D De Diego, A Bareille, G Donard, O.F.X
description	Estuarine and coastal surface sediments from the Adour estuary and adjacent coastal area (South Bay of Biscay) have been investigated to establish mercury species variability in a macrotidal system submitted to contrasted seasonal river discharges and downstream urbanisation. Surface sediments were sampled during three campaigns in the major sediment deposits of the Adour estuary and at selected discharge points. Concentrations of Hg 2+ and MeHg + in Adour estuarine sediments average 1600 and 1.3 pmol g −1, and range from
doi_str_mv	10.1016/j.ecss.2003.10.007
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Surface sediments were sampled during three campaigns in the major sediment deposits of the Adour estuary and at selected discharge points. Concentrations of Hg 2+ and MeHg + in Adour estuarine sediments average 1600 and 1.3 pmol g −1, and range from <2 to 7300 pmol g −1 and from <0.5 to 8.0 pmol g −1, respectively. The concentrations of inorganic ionic mercury (Hg 2+) and monomethylmercury (MeHg +) in the surface sediments display large seasonal variation, being one order of magnitude higher in June 2001 for Hg 2+ and in October 2000 for MeHg +. The results show that Hg 2+ can be accumulated in the estuarine sediments after seasonal river inputs and both remobilised and methylated during dry period. Mercury species concentrations in coastal sediments collected in June 2001 assessed the impact of estuarine inputs on the nearby coastal area. Except direct anthropogenic discharge points, the variability and transfer of Hg 2+ and MeHg + in surface sediments of the whole estuarine–coastal macrotidal system can be depicted by simple geochemical parameters of the bulk sediments, such as grain size distribution, organic carbon and total sulphur.</description><identifier>ISSN: 0272-7714</identifier><identifier>EISSN: 1096-0015</identifier><identifier>DOI: 10.1016/j.ecss.2003.10.007</identifier><identifier>CODEN: ECSSD3</identifier><language>eng</language><publisher>London: Elsevier Ltd</publisher><subject>Adour estuary ; Analytical chemistry ; Animal and plant ecology ; Animal, plant and microbial ecology ; Bay of Biscay ; biogeochemistry ; Biological and medical sciences ; Brackish ; Brackish water ecosystems ; Chemical Sciences ; Fundamental and applied biological sciences. 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subjects	Adour estuary Analytical chemistry Animal and plant ecology Animal, plant and microbial ecology Bay of Biscay biogeochemistry Biological and medical sciences Brackish Brackish water ecosystems Chemical Sciences Fundamental and applied biological sciences. Psychology mercury methylmercury sediment Synecology
title	Dynamics of mercury species in surface sediments of a macrotidal estuarine–coastal system (Adour River, Bay of Biscay)
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