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Arsenic Mobilization from Historically Contaminated Mining Soils in a Continuously Operated Bioreactor: Implications for Risk Assessment

Autor/Autorin
Rajpert, Liwia
Kolvenbach, Boris
Ammann, Erik
Hockmann, Kerstin
Nachtegaal, Maarten
Eiche, Elisabeth
Schäffer, Andreas
Corvini, Philippe
Sklodowska, Aleksandra
Lenz, Markus
Datum
2016
Metadata
Zur Langanzeige
Type
01 - Zeitschriftenartikel, Journalartikel oder Magazin
Zusammenfassung
Concentrations of soil arsenic (As) in the vicinity of the former Złoty Stok gold mine (Lower Silesia, southwest Poland) exceed 1000 μg g–1 in the area, posing an inherent threat to neighboring bodies of water. This study investigated continuous As mobilization under reducing conditions for more than 3 months. In particular, the capacity of autochthonic microflora that live on natural organic matter as the sole carbon/electron source for mobilizing As was assessed. A biphasic mobilization of As was observed. In the first two months, As mobilization was mainly conferred by Mn dissolution despite the prevalence of Fe (0.1 wt % vs 5.4 for Mn and Fe, respectively) as indicated by multiple regression analysis. Thereafter, the sudden increase in aqueous As[III] (up to 2400 μg L–1) was attributed to an almost quintupling of the autochthonic dissimilatory As-reducing community (quantitative polymerase chain reaction). The aqueous speciation influenced by microbial activity led to a reduction of solid phase As species (X-ray absorption fine structure spectroscopy) and a change in the elemental composition of As hotspots (micro X-ray fluorescence mapping). The depletion of most natural dissolved organic matter and the fact that an extensive mobilization of As[III] occurred after two months raises concerns about the long-term stability of historically As-contaminated sites.
Link
http://pubs.acs.org/doi/abs/10.1021/acs.est.6b02037
URI
http://hdl.handle.net/11654/23574
DOI der Originalausgabe
https://doi.org/10.1021/acs.est.6b02037
Übergeordnetes Werk
Environmental Science and Technology
Jahrgang
50
Ausgabe
17
Seiten
9124–9132
Zitation

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