Ruzin and Velke Kozmalovce water reservoirs (Slovakia) receive potentially toxic elements through rivers draining catchment areas polluted with the former extensive mining of ore-bearing deposits. In this study, the concentrations and fractionation of metals (antimony, arsenic, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, vanadium and zinc) have been studied in the surface sediments of the two water reservoirs. Comparison of metal concentrations found in the sediments with the mean shale values revealed a significant anthropogenic enrichment mostly with antimony (22.7), copper (8.5), zinc (5.5), cadmium (4.7), mercury (4.7), arsenic (4.5) and lead (3.9), and antimony (9.8), cadmium (8.8), zinc (4.9), lead (3.3) and arsenic (3.1) in the Ruzin and Velke Kozmalovce reservoirs, respectively. The results of fractionation study showed that the major proportion of cadmium (44.9–52.6%), cobalt (35.7–58.3%) and zinc (27.8–48.7%) was found in labile fractions, i.e., water- and acid-soluble fractions, although copper and nickel exhibited also significant labile fractions. When the risk assessment code was applied to the fractionation study, cadmium and cobalt came under high and very high risk category for the environment, and therefore might cause adverse effect to aquatic life.
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This study was financially supported by the Slovak Grant Agency, project VEGA No. 1/0312/08. We thank also gratefully the Czech Geological Survey, branch Brno (Czech Republic) and the Water Research Institute Bratislava (Slovak Republic) for helping us to collect sediment samples and performing the analyses.
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Hiller, E., Jurkovič, Ľ. & Šutriepka, M. Metals in the Surface Sediments of Selected Water Reservoirs, Slovakia. Bull Environ Contam Toxicol 84, 635–640 (2010). https://doi.org/10.1007/s00128-010-0008-y