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(T/MF132) Investigation of the effects of heavy metal pollution in the flood-plain soils of Upper River Tisza. Györi, Z.1, Kovács, B.1, Alapi, K.1, 1 ABSTRACT- During the year 2000. there were two considerable pollution waves of heavy metals with different effect in the River Tisza, which is the second-biggest river of Hungary. The first pollution wave brought cyanide in a very high concentration together with copper and zinc. The second pollution contained little quantity of dissolved compounds but it had a considerable floating sediment quantity of lead, copper, and zinc-sulphide. The second pollution wave originated from bursting of the dam in an old mine. During the flood the floating sediments settled in the flood-plain and made there a new layer. In the flood-plain beside the natural flora, in some places arable plant cultivation, pomiculture and grazing animal keeping are pursued. Hence the change of the amount of toxic and potentially toxic elements in the soil including their ratio can be uptaken by plants is highly important. To examine this problem, soil and plant samples were taken in different places around Tisza in various distances from the polluting source. The analysis focused on different layers in the 0-300 cm thick of soil and on the elements can be gained applying Lakanen-Erviö extracting solution and sequential extraction (McGrath) than measured with ICP-OES equipment. After botanic identification the plant samples (grasses and feral plants) were prepared using nitric acid-hydrogen peroxide digestion and the quantity of the elements were determined with ICP-OES equipment. The results are partly revealed. Key words: soil, pollution, heavy metals |
