2017
DOI: 10.1021/acs.est.7b01005
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Solid Phase Speciation and Solubility of Vanadium in Highly Weathered Soils

Abstract: Vanadium (V) is increasingly recognized both as a medical trace element with essential biological functions and as a potentially toxic environmental pollutant, yet the current knowledge on V speciation in soils is limited. Here, we investigated the chemical speciation and extractability of V in highly weathered tropical soils, which are often rich in V compared to soils of temperate climatic regions. Vanadium K-edge X-ray absorption near edge structure (XANES) spectra of soil samples, along with a range of ref… Show more

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Cited by 55 publications
(42 citation statements)
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“…The mobile fractions (the sum of desorption [F1] and exchangeable [F2] fractions) contributed only to a very small degree to the total soil V. This is in agreement with our kinetic batch experimental results in that a significant amount of V was irreversibly sorbed on Sharkey soil. Besides, this readily leachable V fraction is considered to be the most bioaccessible, since it could rapidly be released into soil solution (Wisawapipat and Kretzschmar, 2017). For all soil samples, V forms were mainly in the Fe or Al oxide fraction (34.6–65.2%), followed by desorbed (9.9–29.6%), organic matter (7.5–10.6%), exchangeable (4.3–12.0%), and residual (2.2–5.3%) fractions (Fig.…”
Section: Resuls and Discussionmentioning
confidence: 99%
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“…The mobile fractions (the sum of desorption [F1] and exchangeable [F2] fractions) contributed only to a very small degree to the total soil V. This is in agreement with our kinetic batch experimental results in that a significant amount of V was irreversibly sorbed on Sharkey soil. Besides, this readily leachable V fraction is considered to be the most bioaccessible, since it could rapidly be released into soil solution (Wisawapipat and Kretzschmar, 2017). For all soil samples, V forms were mainly in the Fe or Al oxide fraction (34.6–65.2%), followed by desorbed (9.9–29.6%), organic matter (7.5–10.6%), exchangeable (4.3–12.0%), and residual (2.2–5.3%) fractions (Fig.…”
Section: Resuls and Discussionmentioning
confidence: 99%
“…In general, sandy soil has a lower affinity for V than clay and silt soils due to the occurrence of ion‐exchange sites in the latter. The ion‐exchangeable fraction represents a readily mobile V fraction that could rapidly be released into soil solution (Imtiaz et al, 2015; Wisawapipat and Kretzschmar, 2017). Over the past three decades, several studies were performed to investigate various environmental factors of V retention in the soil–water environment.…”
mentioning
confidence: 99%
“…Moreover, fits were accepted only in cases when the weighting fractions summed to 100 ± 10%, and fractions were renormalized to a sum of 100% (Larsson et al, 2017). A standard was included in the fit only if it contributed to an improved goodness of fit according to Athena, and the fit quality was judged on the basis of R‐factor [ R = Σ(data fit) 2 /Σ (data) 2 ] (Calvin, 2013; Wisawapipat and Kretzschmar, 2017). …”
Section: Methodsmentioning
confidence: 99%
“…XANES analysis for Windsor and Mahan soils confirmed that most of Mo was bound to kaolinite during long-term reaction time. Therefore, we deduce that these two fractions (F3/F4) are associated with phyllosilicates (e.g., kaolinite) and other recalcitrant minerals, because strong acids cannot totally dissolve phyllosilicates and silicates [36]. This indicated the surface irreversible reaction may be an important process at long residence times.…”
Section: Multi-reaction Modeling and Reaction Mechanismsmentioning
confidence: 91%
“…In addition, fits were accepted only in cases when the weighting fractions summed to 100% ± 10%, and fractions were renormalized to a sum of 100% [33,34]. A standard was included in the fit only if it made an improvement of fit according to Athena, and the fit quality was judged on the basis of R-factor value [R = (data fit) 2 / (data) 2 ] [35,36]. If a component was not included, it means the fits were not improved.…”
Section: Mo K Edge Xanes Analysismentioning
confidence: 99%