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Journal ArticleDOI

Geochemistry of trace metals in the Gironde estuary

TL;DR: In this paper, the authors measured the dissolved, particulate, and (by cross-flow filtration) colloidal fractions of Cd, Ni, Zn, Cu, Pb, Mn, and Fe in the Gironde, an estuary in southwestern France.
About: This article is published in Geochimica et Cosmochimica Acta.The article was published on 1997-04-01. It has received 199 citations till now.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors used excitation-emission matrix (EEM) spectroscopy, a sensitive technique that allows direct analysis of water samples, to better characterize DOM in the Gironde Estuary (southwestern France).

1,180 citations

Journal ArticleDOI
TL;DR: A new database on the chemical composition of suspended matter in World Rivers, together with the associated elemental fluxes is presented, showing that riverine fluxes are similar to anthropogenic fluxes, which casts light on the effect of human activities on the cycles of trace elements at the Earth's surface.

572 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the biogeochemical cycling of copper (Cu) and zinc (Zn) isotopes in the ocean and presented estimates for the isotopic composition of the inputs to the oceans based on new data presented here and published data.

227 citations

Journal ArticleDOI
TL;DR: Concentrations of dissolved metals were determined for summer and winter, under low-flow conditions in Port Jackson, a microtidal, well-mixed estuary in south-east Australia, and provide a data set against which the long-term contamination may be assessed.

140 citations


Cites background from "Geochemistry of trace metals in the..."

  • ...A Cd mid-estuary maximum has also been observed in other estuaries (ElbazPoulichet et al., 1987; Kraepiel et al., 1997)....

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  • ...For instance, the range of Zn:Cd ratios for Gironde estuary is 40–60 (Kraepiel et al., 1997) whereas for Scheldt estuary is 38–308 (Duinker et al., 1982)....

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  • ...A large mid-salinity maximum in dissolved Cd concentrations is a typical feature of many estuaries (ElbazPoulichet et al., 1996; Kraepiel et al., 1997; Zwolsman et al., 1997)....

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Journal ArticleDOI
TL;DR: Results suggest trace metal recycling due to reductive dissolution under suboxic conditions at the sediment surface resulting in trace metal release to the water column and adsorption onto suspended particles.

138 citations

References
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09 Oct 2011
TL;DR: Erratum to: Aminocarboxylic Acids to: Iminodiacetic Acid Derivatives to: Peptides to: Aliphatic Amines to: Protonation Values for other Ligands.
Abstract: Aminocarboxylic Acids.- Iminodiacetic Acid Derivatives.- Peptides.- Anilinecarboxylic Acids.- Pyrrolecarboxylic Acid.- Pyrazlinecarboxylic Acid.- Pyridinecarboxylic Acids.- Aliphatic Amines.- Azoles.- Azines.- Aminophosphonic Acids.- Carboxylic Acids.- Phosphorus Acids.- Phenols.- Carbonyl Ligands.- Alcohols.- Polyethers.- Thioethers.- Thiols.- Phosphines.- Hydroxamic Acids.- Oximes.- Amides.- Inorganic Ligands.- Protonation Values for other Ligands.- Ligands Considered But Not Included.- Erratum to: Aminocarboxylic Acids.- Erratum to: Iminodiacetic Acid Derivatives.- Erratum to: Peptides.- Erratum to: Aliphatic Amines.- Erratum to: Azoles.- Erratum to: Azines.- Erratum to: Carboxylic Acids.- Erratum to: Phosphorus Acids.- Erratum to: Phenols.- Erratum to: Carbonyl Ligands.- Erratum to: Alcohols.- Erratum to: Polyethers.- Erratum to: Thioethers.- Erratum to: Hydroxamic Acids.- Erratum to: Oximes.- Erratum to: Amides.- Erratum to: Inorganic Ligands.- Erratum to: Protonation Values for other Ligands.- Erratum to: Bibliography.

6,389 citations

Journal ArticleDOI
TL;DR: In this paper, a new approach to estuarine studies is presented which establishes 1) the extent and salinity dependence of non-conservative behaviour; 2) composition and chemical form of removal products; and 3) abiological removal mechanisms.

1,030 citations


"Geochemistry of trace metals in the..." refers background or result in this paper

  • ...As noted above, the large fraction of the total dissolved Fe that is actually colloidal precipitates at low salinity (S Sholkovitz, 1976; Figueres et al., 1978)....

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  • ...This behavior of Fe undoubtedly reflects a loss of colloidal iron through coagulation, as noted by previous authors ( Sholkovitz, 1976; Figueres et al., 1978)....

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Journal ArticleDOI
TL;DR: A survey of U.S. east coast estuaries confirms that large-scale rapid removal of iron from river water is a general phenomenon during estuarine mixing as discussed by the authors.

669 citations

Journal ArticleDOI
TL;DR: Copper titrations were conducted at sea with differential pulse anodic stripping voltammetry to examine the degree to which copper was associated with organic ligands as discussed by the authors, finding that approximately 50-70% of the total dissolved copper was in the organically complexed form.
Abstract: Copper titrations were conducted at sea with differential pulse anodic stripping voltammetry to examine the degree to which copper was associated with organic ligands. Greater than 99.7% of the total dissolved copper in surface waters of the central Northeast Pacific shallower than 200 m was estimated to be associated with strong organic complexes. Below 200 m, increasing proportions of inorganic or labile copper spccics were observed. At middepths (1,000 m), about 50-70% of the total dissolved copper was in the organically complexed form. Whereas total copper varies by a factor of only three from the surface to middepths (0.6-I .8 nM), copper complexation gives rise to extremely low cupric ion activities in surface waters ({Cu!‘} = 1.4 x lo-l4 M) and higher values at middepth ({Cuz-I} = lo- I1 M)-a variation of three orders of magnitude. Two classes of copperbinding ligands were found to be responsible for this complexation: an extremely strong ligand class [log K’cond (cu,j = 11.5 J at low concentrations (- 1.8 nM) -which dominated copper complexation in the surface waters and decreased with depth, and a weaker class of ligands [log K’cond(Cu3 = 8.51 at higher concentrations (8-10 nM) which was observed throughout the water column and showed no apparent structure in its vertical distribution. These findings have significant implications concerning the toxicity and bioavailability of copper in open ocean systems.

496 citations


"Geochemistry of trace metals in the..." refers background in this paper

  • ...Further, dissolved Cu is usually considered dominated by organic complexes in estuaries as in all natural waters (e.g., Coale and Bruland, 1988; Dai et al., 1995)....

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Journal ArticleDOI
TL;DR: In this paper, the complexation of Cd by natural organic ligands in the upper 600 m of the central North Pacific was determined with differential pulse anodic stripping voltametry at a thin mercury film, rotating glassy-carbon disk electrode.
Abstract: The complexation of Cd by natural organic ligands in the upper 600 m of the central North Pacific was determined with differential pulse anodic stripping voltametry at a thin mercury film, rotating glassy-carbon disk electrode. About 70% of the dissolved Cd in surface waters was bound in strong complexes (K’,,, ,‘,, c.,2, = 10’2.0 M-‘) by relatively Cd-specific organic ligands existing at low concentrations (0.1 nM). This ligand class is only observed within the surface 175 m and exhibits a concentration maximum at depths between 40 and 100 m. Due to the complexation of dissolved Cd in surface waters by this class of organic ligands, together with the vertical distribution of total dissolved Cd (ranging from 2 to 800 PM), the concentration of inorganic forms of Cd varies from o-O.7 pM in surface waters to 800 pM at 600 m. The concentration of free Cd ion ranges from 20 fM (- lo- 13.7 M) in surface waters to 22 pM at 600 m-a 1 ,OOO-fold variation! Although complexation with inorganic chloride ligands dominates the speciation of Cd in intermediate and deep waters, these results demonstrate that complexation with natural organic ligands is important in influencing Cd speciation in oceanic surface waters.

450 citations


"Geochemistry of trace metals in the..." refers background in this paper

  • ...This is a surprising result since there is now much evidence showing that Cd and Zn are usually bound to strong organic ligands, at least in seawater (see for example Bruland, 1989, 1992 )....

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