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Bottom sediments are a specific component of aquatic ecosystems. They are actively involved in the accumulation, redistribution and mass transfer of chemical elements, including heavy metals. They can contribute to the purification of the water column, due to its depositing properties. However, they can also serve as a source of secondary pollution, as a result of the transition of pollutants into the suspended matter. The intensity of accumulation and migration of substances is directly dependent on the lithologi...