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Antimonite Binding to Natural Organic Matter : Spectroscopic Evidence from a Mine Water Impacted Peatland

Title data

Besold, Johannes ; Eberle, Anne ; Noel, Vincent ; Kujala, Katharina ; Kumar, Naresh ; Scheinost, Andreas C. ; Lezama Pacheco, Juan ; Fendorf, Scott ; Planer-Friedrich, Britta:
Antimonite Binding to Natural Organic Matter : Spectroscopic Evidence from a Mine Water Impacted Peatland.
In: Environmental Science & Technology. Vol. 53 (22 August 2019) Issue 18 . - pp. 10792-10802.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.9b03924

Abstract in another language

Peatlands and other wetlands are sinks for antimony (Sb), and solid natural organic matter (NOM) may play an important role in controlling Sb binding. However, direct evidence of Sb sequestration in natural peat samples is lacking. Here, we analyzed solid phase Sb, iron (Fe), and sulfur (S) as well as aqueous Sb speciation in three profiles up to a depth of 80 cm in a mine water impacted peatland in northern Finland. Linear combination fittings of extended X-ray absorption fine structure spectra showed that Sb binding to Fe phases was of minor importance and observed only in the uppermost layers of the peatland. Instead, the dominant (to almost exclusive) sequestration mechanism was Sb(III) binding to oxygen-containing functional groups, and at greater depths, increasingly Sb(III) binding to thiol groups of NOM. Aqueous Sb speciation was dominated by antimonate, while antimonite concentrations were low, further supporting our findings of much higher reactivity of Sb(III) than Sb(V) toward peat surfaces. Insufficient residence time for efficient reduction of antimonate to antimonite currently hinders higher Sb removal in the studied peatland. Overall, our findings imply that Sb(III) binding to solid NOM acts as an important sequestration mechanism under reducing conditions in peatlands and other high-organic matter environments.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER153388
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Environmental Geochemistry Group > Professor Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 550 Earth sciences, geology
Date Deposited: 04 Nov 2019 08:43
Last Modified: 23 Jan 2020 08:35
URI: https://eref.uni-bayreuth.de/id/eprint/52189