Scholarly record
THE ROLE OF SECONDARY OXIDES IN POTENTIALLY TOXIC ELEMENTS MIGRATION
Abstract
Potentially toxic elements such as arsenic and antimony represent dangerous contaminants for the ground and surface water around abandoned Sb deposits in Slovakia. Therefore, we are working on a complex study on the material from tailings, including mineralogy, water quality and microbial inhabitants of the contaminated waters. The aim of the work presented here, was to observe the chemical composition of iron ochres and the role of the microbial diversity in the mobilization or immobilization of As and Sb from a contaminated landfill. In 2018, arsenic rich (up to 28.3 wt%) and Sb rich (up to 2.7 wt%) samples of HFO were collected at four localities in Slovakia. All samples were analyzed, after appropriate dilution, for As and Sb. An Illumina MiSeq sequencing platform was applied to detect microbial species composition of the ochre samples. For all four sites (Pezinok, Medzibrod, Dubrava and Cucma), we report a chemical composition and a detailed description of the species composition. The most common species of all sites were Rhodoferax spp. (dissimilatory iron reducing bacteria) and Methylobacter spp. (facultative methylotroph). The highest difference in frequency of the bacterial species composition were observed at the site Cucma, where one species (Methylobacter spp.) formed the majority of the sample. The abundance and high diversity of bacterial community have proven to be highly important in the process of mobilization or immobilization of the potentially toxic elements.
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