V oxidation state and coordination number in silicate glasses by XAS

Giuli, Gabriele; Paris, Eleonora; Mungall, James E.; Romano, Cláudia; Dingwell, Donald B.

doi:10.2138/am-2004-11-1208

Cited by 80 publications

(94 citation statements)

References 20 publications

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“…Vanadium(II) lacks a pre-edge peak [29] and the intensities of the pre-edge peaks in the BF slag spectra were half of the intensity measured in the V 2 O 3 standard. However, they corresponded well to the intensities reported for vanadium(III) compounds in the literature, ranging from 0.06 to 0.08 [26,29,38]. The E 1/2 of the slags was in the same range as the V 2 O 3 standard.…”

Section: Vanadium Concentrations and Speciation In Slags And Soilssupporting

confidence: 88%

Vanadium bioavailability in soils amended with blast furnace slag

Larsson

Baken

Smolders

et al. 2015

Journal of Hazardous Materials

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Blast furnace (BF) slags are commonly applied as soil amendments and in road fill material. In Sweden they are also naturally high in vanadium. The aim of this study was to assess the vanadium bioavailability in BF slags when applied to soil. Two soils were amended with up to 29 % BF slag (containing 800 mg V kg -1 ) and equilibrated outdoors for 10 months before conducting a barley shoot growth assay. Additional soil samples were spiked with dissolved vanadate(V) for which assays were conducted two weeks (freshly spiked) and 10 months (aged) after spiking. The BF slag vanadium was dominated by vanadium(III) as shown by V K-edge XANES spectroscopy. In contrast, results obtained by HPLC-ICP-MS showed that vanadium(V), the most toxic vanadium species, was predominant in the soil solution. Barley shoot growth was not affected by the BF slag additions. This was likely due to limited dissolution of vanadium from the BF slag, preventing an increase of dissolved vanadium above toxic thresholds. The difference in vanadium bioavailability among treatments was explained by the vanadium concentration in the soil solution. It was concluded that the vanadium in BF slag is sparingly available. These findings should be of importance in environmental risk assessment.

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Section: Vanadium Concentrations and Speciation In Slags And Soilssupporting

confidence: 88%

Vanadium bioavailability in soils amended with blast furnace slag

Larsson

Baken

Smolders

et al. 2015

Journal of Hazardous Materials

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“…These features are related to dipole and quadruple transitions from the metal 1s core state to metal 3d with some contribution from 4p depending on the local symmetry. Their intensity and energy therefore depend on the valence state and site symmetry of the metal cation (Calas and Petiau 1983;Farges et al 2001;Giuli et al 2003Giuli et al , 2004Sutton et al 2005;Westre et al 1997;Wilke et al 2001).…”

Section: Resultsmentioning

confidence: 99%

“…We focused on pre-edge features, which strongly depend on the valence state and coordination number of transition elements (Calas and Petiau 1983;Farges et al 2001;Giuli et al 2003Giuli et al , 2004Sutton et al 2005;Westre et al 1997;Wilke et al 2001). Additional 57 Fe Mössbauer spectra were performed on the Fe-containing samples to examine the relationship between the oxidation state of Cr and Fe.…”

Section: Introductionmentioning

confidence: 99%

XANES study of the oxidation state of Cr in lower mantle phases: Periclase and magnesium silicate perovskite

Eeckhout

Bolfan-Casanova

McCammon

et al. 2007

American Mineralogist

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“…Cr EXAFS data were also collected for three glasses from the more Cr-rich Z10-G-60C and Q10-G-136D series, which spanned one glass series from the oxidized parent glass to the most reduced glass where the corresponding melt was exposed to the longest bubbling time. V and Cr environments have been characterized in silicate and borosilicate glasses [2][3][4][5][6][7][8] [4][5][6], but can also be seen as Cr 2+ [7].…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Vanadium and chromium redox behavior in borosilicate nuclear waste glasses

McKeown

Muller

Gan

et al. 2011

Journal of Non-Crystalline Solids

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X-ray absorption spectroscopy (XAS) was used to characterize vanadium (V) and chromium (Cr) environments in low activity nuclear waste (LAW) glasses synthesized under a variety of redox conditions. V 2 O 5 was added to the melt to improve sulfur incorporation from the waste; however, at sufficiently high concentrations, V increased melt foaming, which lowered melt processing rates. Foaming may be reduced by varying the redox conditions of the melt, while small amounts of Cr are added to reduce melter refractory corrosion. Three parent glasses were studied, where CO-CO 2 mixtures were bubbled through the corresponding melt for increasing time intervals so that a series of redox-adjusted-glasses was synthesized from each parent glass. XAS data indicated that V and Cr behaviors are significantly different in these glasses with respect to the cumulative gas bubbling times: V 4+ /V total ranges from 8 to 35%, while Cr 3+ /Cr total can range from 15 to 100% and even to population distributions including Cr 2+. As Nacontent decreased, V, and especially, Cr became more reduced, when comparing equivalent glasses within a series. The Na-poor glass series show possible redox coupling between V and Cr, where V 4+ populations increase after initial bubbling, but as bubbling time increases, V 4+ populations drop to near the level of the parent glass, while Cr becomes more reduced to the point of having increasing Cr 2+ populations.

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V oxidation state and coordination number in silicate glasses by XAS

Cited by 80 publications

References 20 publications

Vanadium bioavailability in soils amended with blast furnace slag

Vanadium bioavailability in soils amended with blast furnace slag

XANES study of the oxidation state of Cr in lower mantle phases: Periclase and magnesium silicate perovskite

Vanadium and chromium redox behavior in borosilicate nuclear waste glasses

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