Abstract
The research results of molybdenum form migration in the water of the Lybid river. The total molybdenum content was 5,8–35,0 μg/dm3, which is much higher than in the water of the Kaniv reservoir – 2,7–8,0 μg/dm3. The ratio of dissolved and suspended molybdenum forms was 80,8–98,5 and 1,5–19,2 %, respectively. The peculiarity of the Lybid river was the presence of molybdate-ions in all sections of the river. This caused a high concentration of dissolved molybdenum form and is an indication of anthropogenic pollution. Molybdate-ions are detected throughout the entire length of the river. They comprised of 5,6–23,2 μg/dm3 and always exceeded the maximum permissible concentration for fishery reservoirs (1,2 μg/dm3). The molybdate-ion concentration was 15 and 18 times higher in the two sections of the Lybid river. Due to their high concentration this can be dangerous for the development of hydrobiota, because the MoO42-–ions are toxins to living organisms. In conclustion, the molybdate-ions in the water of the Lybid river were partly connected to complexes of dissolved organic matters (DOM). The main groups of which are carbohydrates and protein, humic substances. As a result of the processes of water dilution and complexation with DOM, in the water of the Kaniv reservoir, the MoO42- -ions weren’t detected. The humic substances played the primary role in the complexation of molybdate-ions.
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