<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-edge absorption spectra of selected vanadium compounds

Wong, Joe; Lytle, F. W.; Messmer, R. P.; Maylotte, D. H.

doi:10.1103/physrevb.30.5596

Cited by 1,055 publications

(919 citation statements)

References 67 publications

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“…In addition, the valence state of Cr cations can be deduced from the energy shift of the absorption edge or from the pre-edge absorption features (Arčon et al, 1998;Pantelouris et al, 2004). From the spectra of the Cr 2 O 3 , Ca 10 Cr 6 O 25 and CaCrO 4 reference samples which display III, V and VI chromium oxidation states respectively, we found Cr K-edge shifts of about 3 eV per valence state, while the shift of the tetrahedral pre-edge resonance (in Ca 10 Cr 6 O 25 and CaCrO 4 ) was 1.2 eV per valence state, in agreement with previous observations (Arčon et al, 1998;Wong et al, 1984). The XANES spectra of CrO 4 2À with added HAs exhibited identical Cr K-edge profiles as that of CrO 4 2À without HAs.…”

Section: X-ray Absorption Spectroscopy (Xanes Exafs)supporting

confidence: 91%

“…2a and b. The shape of the K-edge and the pre-edge resonances are characteristic for the local symmetry of the investigated atom and can be used as fingerprints in identification of its local structure (Arčon et al, 1998;Bianconi et al, 1991;Lytle et al, 1988;Pantelouris et al, 2004;Wong et al, 1984). Tetrahedrally coordinated Cr(VI) cations with 3d 0 ground state electronic configuration in CaCrO 4 , Ca 10 Cr 6 O 25 and in CrO 4 2À cluster in aqueous solution exhibit a characteristic isolated pre-edge peak, which can be assigned to the electron transition from Cr 1s core level to the lowest unoccupied tetrahedral molecular orbital 7t 2 (Arčon et al, 1998;Bianconi et al, 1991).…”

Section: X-ray Absorption Spectroscopy (Xanes Exafs)mentioning

confidence: 99%

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Soil humic acids may favour the persistence of hexavalent chromium in soil

Leita

Margon

Pastrello

et al. 2009

Environmental Pollution

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The interaction between hexavalent chromium Cr(VI), as K 2 CrO 4 , and standard humic acids (HAs) in bulk solution was studied using three complementary analytical methods: UV-Visible spectroscopy, X-ray absorption spectroscopy and differential pulse stripping voltammetry. The observed UV-Vis and X-ray absorption spectra showed that, under our experimental conditions, HAs did not induce reduction of Cr(VI) to its trivalent chemical form. The interaction between Cr(VI) and HAs has rather led to the formation of Cr(VI)-HAs micelles via supramolecular chemical processes. The reported results could contribute towards explaining the relative persistence of ecotoxic hexavalent chromium in soils.

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Section: X-ray Absorption Spectroscopy (Xanes Exafs)supporting

confidence: 91%

Section: X-ray Absorption Spectroscopy (Xanes Exafs)mentioning

confidence: 99%

Soil humic acids may favour the persistence of hexavalent chromium in soil

Leita

Margon

Pastrello

et al. 2009

Environmental Pollution

View full text Add to dashboard Cite

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“…The spectra of the measured standards were in accordance with the literature [29,36] showing an increase in pre-edge peak intensity and E 1/2 with increasing oxidation state (Table S1). When the pre-edge peak intensity and the E 1/2 of the XANES spectra of the two BF slags were compared to those of the standards, it was possible to estimate the predominating valence state, which was +3 (Figure 1).…”

Section: Vanadium Concentrations and Speciation In Slags And Soilssupporting

confidence: 84%

“…The first derivative maximum of the K-edge of vanadium metal, E 0 , was set to 5465 eV. All samples were normalized by fitting two parallel lines in the preedge and post-edge regions, according to Wong et al [29]. The pre-edge peak area and intensity of the spectra were thereafter determined from the peak-fit function in Athena by which the base-line was fitted with an arctangent and an error function, whereas and the peak was fitted with a combination of Gaussian functions.…”

Section: Vanadium Speciation Analysis: Xanes Spectroscopy and Hplc-icmentioning

confidence: 99%

“…Hence, the occurrence of low vanadium valence states in the blast furnace slag is expected. As the E 1/2 and the pre-edge peak intensity of the vanadium K-edge XANES spectra are positively correlated [29], they are commonly compared to vanadium standards to establish vanadium valence states [36,37]. 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.…”

Section: Vanadium Concentrations and Speciation In Slags And Soilsmentioning

confidence: 99%

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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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An X-Ray Photoelectron and X-Ray Absorption Spectroscopic Study of Colloidal [Mn0·0.3THF]x

Franke¹,

Rothe

Becker

et al. 1998

Adv. Mater.

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The formation of colloidal dispersions of Mn is possible via the chemical reduction of MnBr2·2THF. The resulting hydrogen‐free organosol is studied in detail by a combination of physical methods, including X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption spectroscopy (XAS). It is concluded that the metal colloid consists of small Mn particles in the zero‐valent state, stabilized by intact THF molecules. Nanostructured organosols of the early transition metal series are of interest as powerful additives for the activation of heterogeneous hydrogenation catalysts.

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K-edge absorption spectra of selected vanadium compounds

Cited by 1,055 publications

References 67 publications

Soil humic acids may favour the persistence of hexavalent chromium in soil

Soil humic acids may favour the persistence of hexavalent chromium in soil

Vanadium bioavailability in soils amended with blast furnace slag

An X-Ray Photoelectron and X-Ray Absorption Spectroscopic Study of Colloidal [Mn0·0.3THF]x

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