Insights into the fate of antimony (Sb) in contaminated soils: Ageing influence on Sb mobility, bioavailability, bioaccessibility and speciation.

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Abstrakt

Tytuł:: Insights into the fate of antimony (Sb) in contaminated soils: Ageing influence on Sb mobility, bioavailability, bioaccessibility and speciation.
Autorzy:: Diquattro S; Dipartimento di Agraria, University of Sassari, Viale Italia 39/B, 07100 Sassari, Italy.
Castaldi P; Dipartimento di Agraria, University of Sassari, Viale Italia 39/B, 07100 Sassari, Italy.
Ritch S; Future Industries Institute, University of South Australia, Mawson Lakes Campus, Adelaide, SA 5095, Australia.
Juhasz AL; Future Industries Institute, University of South Australia, Mawson Lakes Campus, Adelaide, SA 5095, Australia.
Brunetti G; Future Industries Institute, University of South Australia, Mawson Lakes Campus, Adelaide, SA 5095, Australia.
Scheckel KG; U. S. Environmental Protection Agency, Office of Research and Development, Center for Environmental Solutions and Emergency Response, Cincinnati, OH 45268, United States.
Garau G; Dipartimento di Agraria, University of Sassari, Viale Italia 39/B, 07100 Sassari, Italy. Electronic address: .
Lombi E; Future Industries Institute, University of South Australia, Mawson Lakes Campus, Adelaide, SA 5095, Australia.
Źródło:: The Science of the total environment [Sci Total Environ] 2021 May 20; Vol. 770, pp. 145354. Date of Electronic Publication: 2021 Jan 24.
Typ publikacji:: Journal Article
Język:: English
Imprint Name(s):: Original Publication: Amsterdam, Elsevier.
MeSH Terms:: Antimony*/analysis
Soil Pollutants*/analysis
Biological Availability ; Environmental Pollution/analysis ; Soil
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Grant Information:: EPA999999 United States ImEPA Intramural EPA
Contributed Indexing:: Keywords: Ageing; Antimony; Bioaccessibility; Potential bioavailability; X-ray absorption near-edge structure (XANES) spectroscopy
Substance Nomenclature:: 0 (Soil)
0 (Soil Pollutants)
9IT35J3UV3 (Antimony)
Entry Date(s):: Date Created: 20210319 Date Completed: 20210322 Latest Revision: 20220521
Update Code:: 20240105
PubMed Central ID:: PMC8064402
DOI:: 10.1016/j.scitotenv.2021.145354
PMID:: 33736407
: Czasopismo naukowe

The effect of long-term ageing (up to 700 days) on the mobility, potential bioavailability and bioaccessibility of antimony (Sb) was investigated in two soils (S1: pH 8.2; S2: pH 4.9) spiked with two Sb concentrations (100 and 1000 mg·kg -1 ). The Sb mobility decreased with ageing as highlighted by sequential extraction, while its residual fraction significantly increased. The concentration of Sb (C DGT ), as determined by diffusive gradients in thin films (DGT), showed a reduction in potential contaminant bioavailability during ageing. The DGT analysis also showed that Sb-C DGT after 700 days ageing was significantly higher in S1-1000 compared to S2-1000, suggesting soil pH plays a key role in Sb potential bioavailability. In-vitro tests also revealed that Sb bioaccessibility (and Hazard Quotient) decreased over time. Linear combination fitting of Sb K-edge XANES derivative spectra showed, as a general trend, an increase in Sb(V) sorption to inorganic oxides with ageing as well as Sb(V) bound to organic matter (e.g. up to 27 and 37% respectively for S2-100). The results indicated that ageing can alleviate Sb ecotoxicity in soil and that the effectiveness of such processes can be increased at acidic pH. However, substantial risks due to Sb mobility, potential bioavailability and bioaccessibility remained in contaminated soils even after 700 days ageing.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)

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