|
(38-25) Heavy metal pollution in the mud of the River Tisza. Gyori, Zoltan1, Alapi, Krisztina*,1, 1 University of Debrecen, Agricultural Centre, Boszormenyi str. 138., Debrecen, Hungary ABSTRACT- At the beginning of the year 2000 there were two considerable pollutions containing toxic and potentially toxic elements in huge amount on the catchment area of the River Tisza. Some amount of these elements has gone with the water as a dissolved fraction, but a fraction bounded to the floating sediment was deposited on certain sites according to the stream conditions. The second wave of pollution came in a highly disadvantageous time: the flooding river has overflowed its banks, taking the pollution into the flood-plain. Samples are taken from the mud, covering the platforms of chalets in Tivadar and Gergelyiugornya on 05.05.2000. A clearly visible grey layer was seen in the samples. Our work based on the difference between the element contents of the grey layer and the surrounding light layer. Extraction for the chemical analysis were taken according to the MSZ 21470-50 (Hungarian standard) with Lakanen-Ervio extracting solution. The elements were analysed using ICP-OES equipment. The measured elements were Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn. Our results show that the grey layer of the mud samples contained copper, lead and zinc in higher quantity than the light layers'. Supposingly the grey layer was formed from the pollution. New mud samples were taken in 2001 when the flood had been passed over. The structure and element content was compared to the previous year's data. The project will end in 2002. The authors would like to express their thanks to KOM 84/2000 for support. Key words: heavy metal, pollution, flood-plain, mud |
