Arsenic-rich stalactites (0.13-294 g/kg As) collected from abandoned adits of the Plavno and Mikulov mines (NW Czech Republic) consist of HFA, HFO, kaňkite, schwertmannite, and hydrous manganese oxide mineral phases. These phases were often combined in one stalactite, forming domains, layers and coprecipitates. The microbial communities indicated autotrophic oxidation of Fe(II), As(III), and reduced sulphur compounds as the most notable biological processes influencing the mineralogy in studied stalactites.
Jelenová H., Drahota P., Falteisek P., Culka A. (2021): Arsenic-rich stalactites from abandoned mines: Mineralogy and biogeochemistry. Applied Geochemistry 129, 104960. (DOI)
This study investigated As-enriched wetland at the Smolotely-Líšnice Au district (Centra Bohemia) using the combination of geochemical (soil and pore water analyses, S isotopes), mineralogical (microprobe, Raman spectrometry) and biological (DNA extraction) method. In this paper, Magda and her co-authors identified a complex assemblage of As and Fe sulfides (realgar, bonazziite, pyrite, greigite) on the fragments of natural organic matter, which play an active role (very fast microbial sulfate reduction vs. slow transfer of solutes) in arsenic immobilization in polluted wetland systems.
Knappová M., Drahota P., Falteisek L., Culka A., Penížek V., Trubač J., Mihaljevič M., Matoušek T. (2019): Microbial sulfidogenesis of arsenic in naturally contaminated wetland soil. Geochimica et Cosmochimica Acta 267, 33-50. https://doi.org/10.1016/j.gca.2019.09.021
A complete set of new thermodynamic data has been determined for three Al and Fe arsenate minerals: mansfieldite, angelellite and kamarizaite.
Majzlan J., Nielsen U.G., Dachs E., Benisek A., Drahota P., Kolitsch U., Herrmann J., Bolanz R., Števko M. (2018): Thermodynamic properties of mansfieldite (AlAsO4·2H2O), angelellite (Fe2(AsO4)2O3) and kamarizaite (Fe3(AsO4)2(OH)3·3H2O). Mineralogical Magazine 82, 1333-1354. (DOI)
In 2018, Zdeněk Johan Award was awarded to Petr Drahota for his paper: Drahota et al. (2017) Biologically induced formation of realgar deposits in soil, Geochimica et Cosmochimica Acta 218, 237–256. Congratulations!
The findings of this study indicated that the historical mining village of Kaňk is highly contaminated by As, Cu, Pb, and Zn, of which As is the most significant contaminant. Despite the high concencentration of As in mining wastes (∼1.15 wt.%), urban soils (∼0.3 wt.%), and road dusts (∼ 440 mg/kg), risk was associated only with mining waste and contaminated soil material via oral exposure (not the inhalation pathway)
Drahota P., Raus K., Rychlíková E., Rohovec J. (2018): Bioaccessibility of As, Cu, Pb, and Zn in mine waste, urban soil, and road dust in the historical mining village of Kaňk, Czech Republic. Environmental Geochemistry and Health 40, 1495-1512. (DOI)