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  Geochemical behavior of heavy metals and radionuclides in a pit lake affected by acid mine drainage (AMD) in the Muskau Arch (Poland)

Sekudewicz, I., Syczewski, M. D., Rohovec, J., Matoušková, Š., Kowalewska, U., Blukis, R., Geibert, W., Stimac, I., Gąsiorowski, M. (2024): Geochemical behavior of heavy metals and radionuclides in a pit lake affected by acid mine drainage (AMD) in the Muskau Arch (Poland). - Science of the Total Environment, 908, 168245.
https://doi.org/10.1016/j.scitotenv.2023.168245

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 Urheber:
Sekudewicz, Ilona1, Autor
Syczewski, Marcin D.2, Autor              
Rohovec, Jan1, Autor
Matoušková, Šárka1, Autor
Kowalewska, Urszula1, Autor
Blukis, Roberts2, Autor              
Geibert, Walter1, Autor
Stimac, Ingrid1, Autor
Gąsiorowski, Michał1, Autor
Affiliations:
1External Organizations, ou_persistent22              
23.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_754888              

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 Zusammenfassung: Pit lakes in the ‘anthropogenic lake district’ in the Muskau Arch (western Poland; central Europe) are strongly affected by acid mine drainage (AMD). The studied acidic pit lake, ŁK-61 (pH <3), is also exposed to floods due to its location in the flood hazard area, which may significantly influence the geochemical behavior of elements. The elemental compositions of water and lake sediment samples were measured with ICP–OES and ICP–MS. The sediment profile was also examined for 137Cs and 210Po activity concentrations using gamma and alpha spectrometry, respectively. Grain size distribution, mineralogical composition, diatoms, and organic matter content in the collected core were also determined. The key factors responsible for the distribution of selected heavy metals (e.g., Cu, Ni, Pb, Zn) and radioisotopes (137Cs and 210Po) in the bottom sediments of Lake ŁK-61 are their coprecipitation/precipitation with Fe and Al secondary minerals and their sorption onto authigenic and allogenic phases. These processes are likely driven by the lake tributary, which is an important source of dissolved elements. The data also showed that the physiochemical parameters of Lake ŁK-61 water changed during an episodic depositional event, i.e., the flood of the Nysa Łużycka River in the summer of 2010. The flood caused an increase in the water pH, as interpreted from the subfossil diatom studies. The down-core profiles of the studied heavy metal and radionuclide (HMRs) contents were probably affected by this depositional event, which prevented a detailed age determination of the collected lake sediments with 137Cs and 210Pb dating methods. Geochemical modeling indicates that the flood-related shift in the physicochemical parameters of the lake water could have caused the scavenging of dissolved elements by the precipitation of fresh secondary minerals. Moreover, particles contaminated with HMRs have also possibly been delivered by the river, along with the nutrients (e.g., phosphorus and nitrogen).

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Sprache(n): eng - Englisch
 Datum: 20232024
 Publikationsstatus: Final veröffentlicht
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1016/j.scitotenv.2023.168245
GFZPOF: p4 T8 Georesources
GFZPOFWEITERE: p4 T5 Future Landscapes
OATYPE: Green Open Access
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Titel: Science of the Total Environment
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 908 Artikelnummer: 168245 Start- / Endseite: - Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals444
Publisher: Elsevier