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DEVELOPMENT OF ATMOSPHERIC DEPOSITION OF HEAVY METALS IN THE VICINITY OF IRON ORE WORKS IN NIZNA SLANA (SLOVAKIA)
Abstract
The contribution deals with the evaluation of atmospheric deposition monitoring by the modified bulk deposition met hodology (wet and dry), which was focused on selected heavy metals (Fe, Mn, Zn, Pb, Cu, Cr, Cd , As). The long-time monitoring (2001-2010) was realised in the vicinity of siderite mining and processing plant. The works operated until august 2008. The samples were monitored by means of 17 sites located maximally up to 8 km from main source of pollution. Besides the deposition fluxes of heavy metals, mineralogical composition, dispersion and size characteristics of solid particles were studied in selected sa mples. Minerals, such as magnetite + maghemite, hematite and siderite, which surely come from from the technology works were predominantly contained in the samples. The volume contents of solid particles with diameter under 10 μm were about 20 %, nanoparticles were found too. High values of the deposition fluxes of arsenic, manganese and iron were measured in the years 2001 – 2008 compared with different regions. The highest values of deposition fluxes were detected at sampling sites located to the south of the s ource in the central valley in the direction of wind flow. The dependency between emissions of solid pollutants in the particular years and deposition fluxes of these metals was observed. After shutdown in the plant, the decrease of values at the most contaminated sites of deposition of arsenic, manganese and iron by more than 90% was recorded. Such a major change has not been established for other studied metals.
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