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Thallium sorption and speciation in soils: Role of micaceous clay minerals and manganese oxides

Wick, S.; Baeyens, B.; Marques Fernandes, M.; Göttlicher, J.; Fischer, M.; Pfenninger, N.; Plötze, M.; Voegelin, A.

Sorption processes control the solubility of toxic thallium (Tl) in soils and thereby its potential leaching into groundwater or uptake by plants. Micaceous clay minerals and Mn oxides are considered to be key sorbents for Tl in soils. We studied the sorption and speciation of Tl in 36 geogenically Tl-rich topsoil materials from the Swiss Jura Mountains by combining chemical extractions, isotope exchange experiments, adsorption experiments, X-ray absorption spectroscopy (XAS), and sorption modelling. We demonstrate that the relation between exchangeable and soluble Tl determined in batch extractions of soils with only geogenic and with freshly spiked Tl matches adsorption isotherms of freshly spiked Tl, and that this relation can be described with a published 3-site cation exchange model for Tl adsorption onto illite. Complemented with XAS data, the results show that micaceous clay minerals control the short-term solubility of Tl via cation exchange, but also the long-term sequestration of most geogenic soil Tl (>90%) via structural fixation. Adsorption competition with K$^{+}$ and NH$_{4}$$^{+}$ at the frayed edges of micaceous clay minerals greatly affects Tl solubility. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123596
Veröffentlicht am 29.09.2020
DOI: 10.1016/j.gca.2020.07.037
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
ANKA - die Synchrotronstrahlungsquelle am KIT (ANKA)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.11.2020
Sprache Englisch
Identifikator ISSN: 0016-7037, 1872-9533
KITopen-ID: 1000123596
HGF-Programm 56.98.01 (POF III, LK 01)
Betrieb in MML
Erschienen in Geochimica et cosmochimica acta
Band 288
Seiten 83-100
Schlagwörter Thallium, Sorption, Soil, Illite, Clay, Minerals, Manganese oxides
Nachgewiesen in Scopus
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