EXAFS and XANES study of arsenic in contaminated soil

Arčon, Iztok; Elteren, Johannes T. van; Glass, Hylke J.; Kodre, Alojz; Šlejkovec, Zdenka

doi:10.1002/xrs.857

Cited by 37 publications

(20 citation statements)

References 19 publications

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“…Data pertaining to the first shell EXAFS suggest that As(V) is tetrahedrally bound to oxides present on the surface of the Al-WTR, similar to what has been observed for surface bound As-O complexes in soils and soil minerals [28][29][30]. In addition, surface As(III) is bound Table 2 EXAFS fittings for As(III), As(V) model compounds, and surface As(III), As(V) during sorption kinetic experiment with the Al-WTR.…”

Section: Surface Arsenic Speciation By X-ray Absorption Spectroscopysupporting

confidence: 61%

“…Furthermore, the As-Al bond structure seems to be bidentate mononuclear, which typically results in short As-metal bond lengths as shown in many papers in the literature including manganese and iron surface complexes [27]. This short bond length has also been observed in the literature for As-Al interactions in soils [28].…”

Section: Surface Arsenic Speciation By X-ray Absorption Spectroscopymentioning

confidence: 85%

See 1 more Smart Citation

X-ray absorption spectroscopy as a tool investigating arsenic(III) and arsenic(V) sorption by an aluminum-based drinking-water treatment residual

Makris

Sarkar

Parsons

et al. 2009

Journal of Hazardous Materials

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Section: Surface Arsenic Speciation By X-ray Absorption Spectroscopysupporting

confidence: 61%

Section: Surface Arsenic Speciation By X-ray Absorption Spectroscopymentioning

confidence: 85%

X-ray absorption spectroscopy as a tool investigating arsenic(III) and arsenic(V) sorption by an aluminum-based drinking-water treatment residual

Makris

Sarkar

Parsons

et al. 2009

Journal of Hazardous Materials

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“…These phases are major components of As in most oxidized environmental media. Arsenic adsorbed to metal-oxide surfaces have been commonly identified via As XAS in both soil [23][24][25][26] and solid waste [27][28][29]. In addition, As(V) was identified in all of the study materials ranging from 10-100%, although some (6) soils and solid wastes did contain As(III) ranging between 7-90%.…”

Section: Arsenic Speciationmentioning

confidence: 93%

Arsenic Speciation of Contaminated Soils/Solid Wastes and Relative Oral Bioavailability in Swine and Mice

et al. 2018

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Arsenic (As) is one of the most widespread, toxic elements in the environment, and human activities have resulted in a large number of contaminated areas. However abundant, the potential of As toxicity from exposure to contaminated soils is limited to the fraction that will dissolve in the gastrointestinal system and be absorbed into systemic circulation or bioavailable species. In part, the release of As from contaminated soil to gastrointestinal fluid depends on the form of solid phase As, also termed "As speciation". In this study, 27 As-contaminated soils and solid wastes were analyzed using X-ray absorption spectroscopy (XAS) and results were compared to in vivo bioavailability values determined using the adult mouse and juvenile swine bioassays. Arsenic bioavailability was lowest for soils that contained large amounts of arsenopyrite and highest for materials that contained large amounts of ferric arsenates. Soil and solid waste type and properties rather than the contamination source had the greatest influence on As speciation. Principal component analysis determined that As(V) adsorbed and ferric arsenates were the dominant species that control As speciation in the selected materials. Multiple linear regression (MLR) was used to determine the ability of As speciation to predict bioavailability. Arsenic speciation was predictive of 27% and 16% of Relative Bioavailable (RBA) As determined using the juvenile swine and adult mouse models, respectively. Arsenic speciation can provide a conservative estimate of RBA As using MLR for the juvenile swine and adult mouse bioassays at 55% and 53%, respectively.

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“…The absorption spectra are extremely variable in height, FWMH and energy, owing to the well-known fact that XANES spectra shift in shape and energy depending on both the atom oxidation state and the local structure (coordination polyhedron) hosting the probed atom (Foster et al 1998;Paktunc et al 2004;Mottana 2004;Arcon et al 2005).…”

Section: Chemical Analysesmentioning

confidence: 99%

An integrated geochemical and mineralogical approach for the evaluation of arsenic mobility in mining soils

Kreidie¹,

Armiento

Cibin

et al. 2010

J Soils Sediments

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Purpose The assessment of risk related to the presence of potentially toxic elements in soils is strictly related to the knowledge of their form and mobility. These relevant properties depend on the complex interactions of the elements of concern with the soil particles that generally cannot be addressed by a single technique. This study presents an integrated approach implementing geochemical and mineralogical investigation techniques on samples from a former mining area (Tolfa Mountains district, northern Latium, Italy), where exploiting activities occurred until the recent past. In particular, the As total concentration and the As distribution in solid phases is studied with the aim to evaluate the possibility of environmental pollution and consequent risks for the health of people living in the area and possibly affected in case of significant mobilization of this toxic element.Materials and methods Chemical (ICP-MS, ICP-OES) and mineralogical (X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray (SEM-EDX), X-ray absorption near-edge structure (XANES)) analyses and the evaluation of the heavy metal mobility (by means of a sequential extraction procedure) were performed. Results and discussion Chemical analyses show a high As content in the soils collected immediately downstream the marcasite mine waste deposit, that is the starting point of As pollution over the whole area. XANES analyses show that As occurs in two oxidation states (As III and As V ) simultaneously in the tailing samples and nearby, while it has been mainly or totally transformed into As V at increasing distance from the mine. XRD data show that sheet silicates don't affect As behavior, whereas sequential extractions and SEM-EDX analyses reveal the evident association of As and Fe oxyhydroxides content. Conclusions The use of an integrated geochemicalmineralogical approach allows to single out the contaminant forms and the relative potential threat. Arsenic in the surface level of such soils could be mobilized in the case of extreme meteorological or of a not well planned human event, even though there is no evidence yet of any serious contamination of either underground or flowing waters.

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EXAFS and XANES study of arsenic in contaminated soil

Cited by 37 publications

References 19 publications

X-ray absorption spectroscopy as a tool investigating arsenic(III) and arsenic(V) sorption by an aluminum-based drinking-water treatment residual

X-ray absorption spectroscopy as a tool investigating arsenic(III) and arsenic(V) sorption by an aluminum-based drinking-water treatment residual

Arsenic Speciation of Contaminated Soils/Solid Wastes and Relative Oral Bioavailability in Swine and Mice

An integrated geochemical and mineralogical approach for the evaluation of arsenic mobility in mining soils

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