Synchrotron X-ray spectroscopy for investigating vanadium speciation in marine sediment: limitations and opportunities

Bennett, William W.; Lombi, Enzo; Burton, Edward D; Johnston, Scott G; Kappen, Peter; Howard, Daryl L.; Canfield, Donald E.

doi:10.1039/c8ja00231b

Cited by 25 publications

(19 citation statements)

References 36 publications

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“…45,55−57 As expected, normalized pre-edge peak height and area decreased with oxidation state in the reference materials following the order: Na 3 V V O 4 , 48-Fh > VO IV (OH) 2 , VO IV SO 4 ≫ V III Cl 3 (Table S3). On the basis of methods developed by Chaurand et al 56 , Levina et al 55 , and Bennett et al 45 , V oxidation states were estimated using a linear regression (R 2 = 0.980) of the normalized pre-edge peak area (Figure 2a; Table S4). The use of this approach on reference spectra yielded averaged oxidation states of +5.13 (Na 3 V V O 4 ), +4.95 (48-Fh), +3.96 (V IV O(OH) 2 ), +3.88 (V IV OSO 4 ), and +3.08 (V III Cl 3 ) for the reference materials (Table S3).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Aqueous Vanadate Removal by Iron(II)-Bearing Phases under Anoxic Conditions

Vessey

Lindsay

2020

Environ. Sci. Technol.

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Vanadium contamination is a growing environmental hazard worldwide. Aqueous vanadate (H x V V O 4 (3−x)− (aq) ) concentrations are often controlled by surface complexation with metal (oxyhydr)oxides in oxic environments. However, the geochemical behavior of this toxic redox-sensitive oxyanion in anoxic environments is poorly constrained. Here, we describe results of batch experiments to determine kinetics and mechanisms of aqueous H 2 V V O 4 − (100 μM) removal under anoxic conditions in suspensions (2.0 g L −1 ) of magnetite, siderite, pyrite, and mackinawite. We present results of parallel experiments using ferrihydrite (2.0 g L −1 ) and Fe 2+ (aq) (200 μM) for comparison. Siderite and mackinawite reached near complete removal (46 μmol g −1 ) of aqueous vanadate after 3 h and rates were generally consistent with ferrihydrite, whereas magnetite removed 18 μmol g −1 of aqueous vanadate after 48 h and uptake by pyrite was limited. Removal during reaction with Fe 2+ (aq) was observed after 8 h, concomitant with precipitation of secondary Fe phases. X-ray absorption spectroscopy revealed V(V) reduction to V(IV) and formation of bidentate corner-sharing surface complexes on magnetite and siderite, and with Fe 2+ (aq) reaction products. These data also suggest that V(IV) is incorporated into the mackinawite structure. Overall, we demonstrate that Fe(II)-bearing phases can promote aqueous vanadate attenuation and, therefore, limit dissolved V concentrations in anoxic environments.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…contaminated sites,8 and marine systems;45 however, molecular mechanisms of V removal by Fe(II)phases remain poorly constrained.…”

mentioning

confidence: 99%

Aqueous Vanadate Removal by Iron(II)-Bearing Phases under Anoxic Conditions

Vessey

Lindsay

2020

Environ. Sci. Technol.

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“…These works have typically established a functional relationship between the pre-edge peak amplitude (and/or the edge position) and the average V valence state. Other studies have used the linear combination fit (LCF) approach, whereby the experimental spectrum is modeled with weighed combinations of standards spectra [75][76][77][78][79][80][81]. Despite the different approaches in interpreting the data, the general consensus is that as long as the local atomic environment around V in the standards is representative of that in the studied samples, the use of such relationships or of LCFs produces similar results and is reliable in determining the V valence state [4].…”

Section: Xanes Spectra Of V Standardsmentioning

confidence: 99%

“…All samples and standards were measured at the same beamline using the same experimental setup, which results in the same instrumental effects on all spectra. Previous V XANES work has highlighted the importance of comparing spectra measured with the same beamline and setup [75].…”

Section: Xanes Spectra Of V Standardsmentioning

confidence: 99%

“…To avoid the slight dependence of the XANES spectra on V coordination environment within each valence group (Figure 2), the region of the white line was excluded from the LCF. The chosen fit range between 5465 and 5483 eV captures the pre-edge peak intensity and the edge position, i.e., the features that have been used for V valence analysis in prior work due to their strongest and most consistent dependence on the valence state [4,70,73,75]. The combinatorial LCF option of the program ATHENA was employed [66], whereby all combinations of up to 3 of the standards in Figure 2 were tested against the data.…”

Section: Change Of V Valence With Incubation Timementioning

confidence: 99%

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Reduction of Vanadium(V) by Iron(II)-Bearing Minerals

2021

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Fe(II)-bearing minerals (magnetite, siderite, green rust, etc.) are common products of microbial Fe(III) reduction, and they provide a reservoir of reducing capacity in many subsurface environments that may contribute to the reduction of redox active elements such as vanadium; which can exist as V(V), V(IV), and V(III) under conditions typical of near-surface aquatic and terrestrial environments. To better understand the redox behavior of V under ferrugenic/sulfidogenic conditions, we examined the interactions of V(V) (1 mM) in aqueous suspensions containing 50 mM Fe(II) as magnetite, siderite, vivianite, green rust, or mackinawite, using X-ray absorption spectroscopy at the V K-edge to determine the valence state of V. Two additional systems of increased complexity were also examined, containing either 60 mM Fe(II) as biogenic green rust (BioGR) or 40 mM Fe(II) as a mixture of biogenic siderite, mackinawite, and magnetite (BioSMM). Within 48 h, total solution-phase V concentrations decreased to <20 µM in all but the vivianite and the biogenic BiSMM systems; however, >99.5% of V was removed from solution in the BioSMM and vivianite systems within 7 and 20 months, respectively. The most rapid reduction was observed in the mackinawite system, where V(V) was reduced to V(III) within 48 h. Complete reduction of V(V) to V(III) occurred within 4 months in the green rust system, 7 months in the siderite system, and 20 months in the BioGR system. Vanadium(V) was only partially reduced in the magnetite, vivianite, and BioSMM systems, where within 7 months the average V valence state stabilized at 3.7, 3.7, and 3.4, respectively. The reduction of V(V) in soils and sediments has been largely attributed to microbial activity, presumably involving direct enzymatic reduction of V(V); however the reduction of V(V) by Fe(II)-bearing minerals suggests that abiotic or coupled biotic–abiotic processes may also play a critical role in V redox chemistry, and thus need to be considered in modeling the global biogeochemical cycling of V.

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Speciation of antimony and vanadium in municipal solid waste incineration ashes analyzed by XANES spectroscopy

Vogel,

Scholz,

Kalbe

et al. 2024

J Mater Cycles Waste Manag

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The use of ashes from municipal solid waste incineration as secondary building materials is an important pillar for the circular economy in Germany. However, leaching of potential toxic elements from these materials must be at environmentally acceptable levels. Normally, a three-month ageing period immobilizes most hazardous heavy metals, but antimony (Sb) and vanadium (V) showed previously unusual leaching. In order to clarify the mechanisms, we analyzed the Sb and V species in various bottom and fly ashes from municipal waste incineration by XANES spectroscopy. Antimony oxidizes from Sb(+ III) species used as flame retardants in plastics to Sb(+ V) compounds during waste incineration. However, owing to the similarity of different Sb(+ V) compound in the Sb K- and L-edge XANES spectra, it was not possible to accurately identify an exact Sb(+ V) species. Moreover, V is mainly present as oxidation state + V compound in the analyzed ashes. However, the coarse and magnetic fraction of the bottom ashes contain larger amounts of V(+ III) and V(+ IV) compounds which might enter the waste incineration from vanadium carbide containing steel tools. Thus, Sb and V could be critical potential toxic elements in secondary building materials and long-term monitoring of the release should be taken into account in the future.

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Synchrotron X-ray spectroscopy for investigating vanadium speciation in marine sediment: limitations and opportunities

Abstract: Synchrotron-based X-ray spectroscopy is a powerful technique for investigating vanadium speciation in marine sediment.

Cited by 25 publications

References 36 publications

Aqueous Vanadate Removal by Iron(II)-Bearing Phases under Anoxic Conditions

Aqueous Vanadate Removal by Iron(II)-Bearing Phases under Anoxic Conditions

Reduction of Vanadium(V) by Iron(II)-Bearing Minerals

Speciation of antimony and vanadium in municipal solid waste incineration ashes analyzed by XANES spectroscopy

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