Journal article
Antimony(V) sorption and coprecipitation with ferrihydrite: An examination of retention mechanisms and the selectivity of commonly-applied extraction procedures
Journal of hazardous materials, Vol.480, 136297
05/12/2024
PMID: 39490164
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Abstract
We investigated the mechanisms that control Sb(V) sorption and coprecipitation with ferrihydrite across a range of Sb(V) loadings, and examined the associated effects on Sb(V) extractability during the commonly-applied 1 M HCl extraction scheme and the BCR and Wenzel sequential extraction schemes. EXAFS spectroscopy reveals that Sb(V) sorption and coprecipitation mainly involved Sb(V) incorporation into the ferrihydrite structure via edge sharing and double-corner sharing between SbO6 and FeO6 octahedra. Large amounts of these linkages partially stabilized ferrihydrite against extraction with 1 M HCl. Negligible (< 0.5 %) ferrihydrite-bound Sb(V) was recovered in the “acid extractable” and “reducible” fractions of the BCR scheme, while 1–16 % was recovered in the “oxidizable” fraction. As such, the BCR scheme risks ferrihydrite-bound Sb(V) being misidentified as Sb residing mainly in “residual” phases. In contrast, in the Wenzel scheme, almost all sorbed- and coprecipitated-Sb(V) was recovered in the “amorphous hydrous oxide-bound” fraction, with only 0.6–3.3 % in the “specifically-bound” fraction (consistent with our finding of Sb(V) retention via incorporation into ferrihydrite, as opposed to adsorption by the ferrihydrite surface). Collectively, the results provide new insights into the retention mechanisms and extraction behaviour of ferrihydrite-bound Sb(V), enhancing our ability to assess Sb contamination in soils, sediments and geogenic wastes.
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•We examined Sb(V) retention and extractability in Sb(V)-sorbed and -coprecipitated ferrihydrite.•Sb(V) is retained via edge and double-corner sharing between SbO6 and FeO6 octahedra.•Sb(V)-rich ferrihydrite exhibits resistance to dissolution during extraction with 1 M HCl.•The BCR sequential extraction scheme does not adequately recover ferrihydrite-bound Sb(V)•The Wenzel sequential extraction scheme is suitable for determining ferrihydrite-bound Sb(V).
Details
- Title
- Antimony(V) sorption and coprecipitation with ferrihydrite: An examination of retention mechanisms and the selectivity of commonly-applied extraction procedures
- Creators
- Mona Hosseinpour Moghaddam - Southern Cross UniversityNiloofar Karimian - Monash UniversityScott G. Johnston (Author) - Southern Cross UniversityGirish Choppala - University of Newcastle AustraliaMohammad Rastegari - Southern Cross UniversityEdward D. Burton - Southern Cross University
- Publication Details
- Journal of hazardous materials, Vol.480, 136297
- Publisher
- Elsevier B.V
- Grant note
- Australian Research Council: FT200100449 Southern Cross UniversityAustralian Nuclear Science and Technology Organisation
This research was supported by funding from the Australian Research Council (Project FT200100449) and additional financial support from Southern Cross University. X-ray Absorption Spectroscopy was performed on the XAS and MEX-1 beamlines at the Australian Synchrotron, supported by funding from the Australian Nuclear Science and Technology Organisation. We acknowledge the technical assistance of Jessica Hamilton and Jeremy Wykes during data collection on the XAS and MEX-1 beamlines, respectively. The Environmental Analysis Laboratory (EAL) , a research support facility at Southern Cross University, provided analytical support.
- Identifiers
- 991013229213802368
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article