Please use this identifier to cite or link to this item: https://biore.bio.bg.ac.rs/handle/123456789/6598
Title: Thallium hyperaccumulation status of the violets of the Allchar arsenic-thallium deposit (North Macedonia) confirmed through synchrotron µXRF imaging
Authors: Jakovljević, Ksenija 
Mišljenović, Tomica 
Bačeva Andonovska, Katerina
Echevarria, Guillaume
Baker, Alan J M
Brueckner, Dennis
van der Ent, Antony
Keywords: arsenic;excluder;hyperaccumulator;metallophyte;synchrotron-based X-ray fluorescence microscopy (XFM);thallium
Issue Date: 2-Nov-2023
Rank: M22
Publisher: Oxford Academic
Journal: Metallomics : integrated biometal science
Volume: 15
Issue: 11
Abstract: 
The abandoned Allchar Mine in the Republic of North Macedonia is a globally unique deposit with the highest known grades of thallium (Tl) and arsenic (As) mineralization. We aimed to determine the distribution of As and Tl in whole dehydrated shoots of the three Viola taxa using synchrotron micro-X-ray fluorescence analysis. Additionally, soil and plant organ samples were collected from all three Viola taxa at the Allchar site and analysed using inductively coupled plasma-atomic emission spectrometry. Concentrations of Tl were extremely high in all three Viola taxa (up to 58 900 mg kg-1), but concentrations of As were highly variable with V. tricolor subsp. macedonica and V. allchariensis having low As (up to 20.2 and 26.3 mg kg-1, respectively) and V. arsenica having the highest concentrations (up to 381 mg kg-1). The extremely high Tl in all three species is endogenous and not a result of contamination. Arsenic in V. tricolor subsp. macedonica and V. allcharensis is strongly affected by contamination, but not in V. arsenica where it appears to be endogenous. The pattern of As enrichment in V. arsenica is very unusual and coincides with Ca-oxalate deposits and Br hotspots. The results of this study could form the basis for more detailed investigations under controlled conditions, including plant dosing experiments.
URI: https://biore.bio.bg.ac.rs/handle/123456789/6598
ISSN: 1756-591X
DOI: 10.1093/mtomcs/mfad063
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