GIS database of heavy metals in the floodplain of the Tisza River

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Article Title:	GIS database of heavy metals in the floodplain of the Tisza River
Authors:	Szilárd Szabó1, Gyöngyi Gosztonyi1, Beáta Babka1, Nikoletta Dócs1, Mihály Braun2, Péter Csorba1, Gábor Türk1, Lajos Szabolcs Molnár1, Beáta Bakos1, György Szabó1, István Futó3, Sándor Gönczy4, Csaba Ágoston5, Magdolna Szabó1, Gergely Szabó6, József Prokisch7
Affiliation:	1 University of Debrecen, Hungary, Department of Landscape Protection and Environmental Geography 2 University of Debrecen, Debrecen, Hungary, Department of Inorganic and Analytical Chemistry 3 Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary, Ede Hertelendi Laboratory of Environmental Studies 4 Ferenc Rákóczi II. Transcarpathian Hungarian Institute, Berehovo, Hungary, Department of Geosciences 5 KVI-PLUSZ Ltd., Budapest, Hungary 6 Department of Physical Geography and Geoinformatics, Hungary 7 Institute of Bio and Environmental Energetics, University of Debrecen, Hungary
Abstract:	Since it is Hungary’s second largest river, the River Tisza is important both as a river and because of its active floodplain. The contaminations endanger the aquatic and the related living nature as well as the farming in the active floodplain. The water quality of the river is examined regularly by the competent authority but far less information is available about the active floodplain. More data is necessary in order to estimate the potential danger. In this paper the River Tisza and its tributaries were examined, especially considering the metal accumulation and its relation to the soil characteristics. We started to create the database in 2004 and several tasks were achieved: the metal content of the root zone in the active floodplain (horizontal distribution); the metal content of the upper 1 m zone in the active floodplain (vertical distribution); the general water chemical and isotope analyses and the metal content of the oxbow lakes near the River Tisza; the metal content of the sediments of the oxbow lakes. More than 300 surface soil samples, 18 soil profiles (18 x 50 samples) and 45 oxbow lakes were examined up to now. Cu, Co, Fe, Ni, Mn, Zn contents were determined in every case and As, Cd, Pb determinations were also carried out in reasonable cases. ArcGIS 9.0 was applied in order to create the spatial database and the statistical analyses of the data were carried out with SPSS. In this paper some case studies will be presented.
Keywords:	Tisza, heavy metals, soils, oxbow lakes, accumulation
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*Correspondence:	Szilard Szabo, University of Debrecen, Faculty of Technology and Sciences, Department of Landscape Protection and Environmental Geography, no. 1 Egyetem tér, H-4032, Debrecen, Hungary, Tel. +36-(52)-512900, Fax. +36-(52)-512945, email: szszabo@delfin.unideb.hu