Arsenic, antimony and vanadium in the North Atlantic Ocean

Mlddelburg, Jack J.; Hoede, D.; Sloot, H.A. van der; Weijden, C. H. Van der; Wijkstra, J.

doi:10.1016/0016-7037(88)90154-8

Cited by 91 publications

(41 citation statements)

References 35 publications

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“…present as Sb III even under oxidizing conditions since many environmental factors such as biological activity or kinetic considerations cannot be included in the simplified thermodynamic calculations ŽAndreae et al, 1981;Andreae and Froelich, 1984; . Middelberg et al, 1988;Cutter and Cutter, 1995 . Similar reasons can explain the presence of the Ž . oxidized form Sb V in reducing sediment porewa-Ž .…”

Section: Introductionmentioning

confidence: 84%

Oxidation of antimony (III) by amorphous iron and manganese oxyhydroxides

2001

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Amorphous forms of natural and synthetic Fe oxyhydroxides and synthetic Mn oxyhydroxides were used to study the Ž . oxidation of antimonite, Sb III , at different pH values. Sb species were measured by differential pulse adsorptive stripping Ž . Ž . Ž . voltametry DPACSV . The oxidation of Sb III to Sb V was always rapid and completed after a few days following pseudo-first order rate laws. A slightly slower oxidation rate was observed at lower pH and was attributed to the lower Ž . stability of the oxyhydroxide compounds under mildly acidic conditions. The oxidation pseudo-first order rate of Sb III by natural Fe oxyhydroxides was also slower when compared to synthetic Fe compounds. This could be explained by a slight Ž . crystallinity of the natural oxides when compared to amorphous synthetic compounds and by their more complex chemical composition which can include adsorbed ions and organic matter. The study confirms that amorphous Fe and Mn oxyhydroxides present in natural waters and sediments can play a detoxifying role by adsorbing and oxidizing the more toxic Ž . Ž . Sb III into Sb V . q

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Section: Introductionmentioning

confidence: 84%

Oxidation of antimony (III) by amorphous iron and manganese oxyhydroxides

2001

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“…A certain number of studies plainly ignored the conservation issue (e.g. refs [66][67][68][69]). Observations have been summarised in Table A3.…”

Section: Conservation Issuesmentioning

confidence: 99%

Antimony in the environment: knowns and unknowns

2009

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Environmental context. Antimony first attracted public attention in the mid-1990s amid claims that it was involved in Sudden Infant Death Syndrome. A substantial number of papers have now been published on the element and its behaviour in the natural environment. However, many key aspects of the environmental chemistry of antimony remain poorly understood. These include critical areas such as its ecotoxicology, its global cycling through different environmental compartments, and what chemical form it takes in different environments. More focussed research would help the situation. The present review highlights several areas of environmental antimony chemistry that urgently need to be addressed.Abstract. The objective of the present article is to present a critical overview of issues related to the current state of knowledge on the behaviour of antimony in the environment. It makes no attempt to systematically review all published data. However, it does provide a list of the main published reviews on antimony and identifies subjects where systematic reviews are needed. Areas where our knowledge is strong -and the corresponding gaps -in subjects ranging from total concentrations and speciation in the various environmental compartments, to ecotoxicity, to cycling between compartments, are discussed, along with the underlying research. Determining total antimony no longer poses a problem for most environmental samples but speciation measurements remain challenging throughout the process, from sampling to analysis. This means that the analytical tools still need to be improved but experience shows that, to be useful in practice, this should be directly driven by the requirements of laboratory and field measurements. Many different issues can be identified where further research is required, both in the laboratory and in the field, the most urgently needed studies probably being: (i) long-term spatial and temporal studies in the different environmental compartments in order to collect the data needed to establish a global biogeochemical cycle; (ii) laboratory studies of antimony interactions with potential natural binders; (iii) reliable ecotoxicological studies. Montserrat Filella is a chemist and teaches Environmental Chemistry at the University of Geneva, Switzerland. Her main research interests focus on the understanding of the physicochemical processes regulating the behaviour of chemical components in environmental and biological compartments, mainly by combining computer modelling with field and laboratory measurements. The three main axes of her research concern the study of: colloids in natural waters, natural organic matter (quantification and interaction with trace elements) and Group 15 elements. She is also interested in other topics

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“…[34] Microorganisms capable of reducing vanadium have been isolated and the possibility of microbial reduction causing precipitation of V in anoxic environments has been recognised. [35] Several studies have suggested V concentrations are reduced by phytoplankton uptake or biogenic adsorption in surface layers of oceans [36,37] or lakes. [38] Observations of depletions of V in oxic waters of the Mississippi River Delta were initially attributed to these processes.…”

Section: In Situ Profilesmentioning

confidence: 99%

High-resolution two-dimensional quantitative analysis of phosphorus, vanadium and arsenic, and qualitative analysis of sulfide, in a freshwater sediment

2008

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Environmental context. Chemical characterisation of sediment microniches can reveal diagenetic processes that may not be detected by larger-scale analysis. With the development of a new preparation method for a binding phase gel, the technique of diffusive gradients in thin films has been used to demonstrate links between the diagenesis of sulfide, phosphorus, vanadium and arsenic at microniches. Knowledge of these processes may improve predictions of past deposition climates where trace elements are considered as paleoredox proxies. Abstract.Recently introduced techniques that can provide two-dimensional images of solution concentrations in sediments for multiple analytes have revealed discrete sites of geochemical behaviour different from the average for that depth (microniches). We have developed a new preparation method for a binding phase, incorporated in a hydrogel, for the diffusive gradients in thin films (DGT) technique. It allows co-analysis of sulfide and the reactive forms of phosphorus, vanadium and arsenic in the porewaters at the surface of the device. This gel, when dried and analysed using laser ablation mass spectrometry, allows the acquisition of high-resolution sub-millimetre-scale data. The binding phase was deployed within a DGT device in a sediment core collected from a productive lake, Esthwaite Water (UK). Localised removal of phosphate and vanadium from the porewaters has been demonstrated at a microniche of local sulfide production. The possible removal processes, including bacterial uptake and reduction of vanadate to insoluble V III by sulfide, are discussed. Understanding processes occurring at this scale may allow improved prediction of pollutant fate and better prediction of past climates where trace metals are used as paleoredox proxies.

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Arsenic, antimony and vanadium in the North Atlantic Ocean

Cited by 91 publications

References 35 publications

Oxidation of antimony (III) by amorphous iron and manganese oxyhydroxides

Oxidation of antimony (III) by amorphous iron and manganese oxyhydroxides

Antimony in the environment: knowns and unknowns

High-resolution two-dimensional quantitative analysis of phosphorus, vanadium and arsenic, and qualitative analysis of sulfide, in a freshwater sediment

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