Reduction of ionic species by fulvic acid

Skogerboe, R. K.; Wilson, Stephen

doi:10.1021/ac00225a023

Cited by 186 publications

(119 citation statements)

References 37 publications

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“…Furthermore, one can notice that there is a marked difference between the experimental data form different authors for uranium (VI) under low CO 2 (g) partial pressure. 14 Nevertheless, in the case of uranium, neither the results of Li et al [102], nor those from Artinger et al [26] could be assessed by this exercise. In the latter study, the authors did not observe any difference in the behaviour of uranium, introduced as uranium (VI) or uranium (IV), neither with purified HA [102], nor with Gorleben groundwater in the presence of natural organic matter at varying E H [26].…”

Section: Application To Redox Sensitive Actinide Elementsmentioning

confidence: 92%

“…Experimental difficulties have often prevented from obtaining reliable results on reduced states of uranium, neptunium or plutonium. Furthermore, the redox properties of humic substances [3][4][5] have led to confusing results for protactinium [6], neptunium [7,8], plutonium [9][10][11][12] and other elements [13][14][15][16][17][18][19], even if the use of ligands to stabilise redox state is well known in the nuclear industry [20][21][22][23]. Otherwise, the reduction of uranium (VI) by HS has not been clearly observed up to now [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Prognosticating the humic complexation for redox sensitive actinides through analogy, using the charge neutralisation model

Reiller¹

2005

Radiochimica Acta

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To cite this version:Pascal E. Reiller. Prognosticating the humic complexation for redox sensitive actinides through analogy, using the charge neutralisation model. AbstractThe complexation of redox sensitive elements by humic acid (HA), described through the charge neutralisation model (CNM) has been reviewed in order to have a comprehensive scope. The data acquired in HUMICS program on thorium (IV), and data available in the literature, were reinterpreted according to the CNM, and adapted to uranium (IV), neptunium (IV) and plutonium (IV) through analogy in order to draw a boundary prediction. Otherwise, available data obtained in the framework of the CNM were used, or adapted if necessary, for other redox states when the analogy is justified, i.e. Am The obtained speciation diagrams indicate that, when (HA) = 100 mg/L, redox sensitive actinides should be reduced to their +IV state when E H ≤ 650 mV/SHE for plutonium, E H ≤ 100 mV/SHE for neptunium and E H ≤ -20 mV/SHE for U. Plutonium could be present as mixtures of plutonium (III) and (IV) depending on the pH value in reducing ground waters -150 ≤ E H (mV/SHE) ≤ 150. The known reduction of neptunium (V) to neptunium (IV) in Gorleben ground waters seems also well represented, so does the stability of uranium (VI) in humic solution when E H ≥ 100 mV/SHE. Conversely, the known association of plutonium (VI) in marine systems are not satisfactorily represented, so does is the uranium behaviour under reducing conditions. Experiments under well-controlled conditions are still needed to ascertain the plutonium and uranium comportment in the presence of humic acid. *

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Section: Application To Redox Sensitive Actinide Elementsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Prognosticating the humic complexation for redox sensitive actinides through analogy, using the charge neutralisation model

Reiller¹

2005

Radiochimica Acta

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“…Vanadium is likely to be in the measurable form H 2 VO − 4 in the pH range 5-9 and the E h (redox potential) range 0-1 V. [9] Reduction of V V to V IV can occur with organic materials as electron donors, [10,11] with reduction to V III requiring a stronger reductant. V III is rapidly hydrolysed in aqueous solution, resulting in the precipitation of relatively insoluble V III oxyhydroxides.…”

Section: Introductionmentioning

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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“…In this study, due to its highest total acidity which is highest than the other fractions of humic substances, FA is chosen to coat Fe3O4 and the formed Fe3O4-FA is then applied to adsorp [AuCl4] -in aqueous solution [28]. Skogerboe and Wilson [28] reported that fulvic acid had reduction potential approximately 0.5 V (vs normal hydrogen electrode), while the reduction potential of [AuCl4] -is 0.1 V. Its means, reduction of [AuCl4] -into Au(0) occur spontaneously.…”

Section: Introductionmentioning

confidence: 99%

“…Skogerboe and Wilson [28] reported that fulvic acid had reduction potential approximately 0.5 V (vs normal hydrogen electrode), while the reduction potential of [AuCl4] -is 0.1 V. Its means, reduction of [AuCl4] -into Au(0) occur spontaneously. Higher total acidity needed in purpose to increase Fe3O4 stability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Fulvic Acid-Coated Magnetite (Fe3O4–FA) and Its Application for the Reductive Adsorption of [AuCl4]–

2017

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Reduction of ionic species by fulvic acid

Abstract: Studies have shown that a fuivic acid derived from soil is capable of reducing Hg(II) to Hg(0), Fe(III) to Fe(II), and I2 and I3" to under conditions generally characteristic of

Cited by 186 publications

References 37 publications

Prognosticating the humic complexation for redox sensitive actinides through analogy, using the charge neutralisation model

Prognosticating the humic complexation for redox sensitive actinides through analogy, using the charge neutralisation model

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

Synthesis of Fulvic Acid-Coated Magnetite (Fe<sub>3</sub>O<sub>4</sub><sup>–</sup>FA) and Its Application for the Reductive Adsorption of [AuCl<sub>4</sub>]<sup>–</sup>

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