Gyöngyi GOSZTONYI¹, Mihály BRAUN², József PROKISCH³ & Szilárd SZABÓ¹,
¹University of Debrecen, Department of Landscape Protection and Environmental Geography, Egyetem tér 1., 4032, Debrecen, Hungary, e-mail: gosztonyi.gyongyi@gmail.com, szszabo@delfin.klte.hu
²University of Debrecen, Department of Inorganic and Analytical Chemistry, Egyetem tér 1. 4032 Debrecen, Hungary, e-mail: braun@tigris.klte.hu
³ University of Debrecen, Centre of Agricultural and Applied Economic Sciences, Institute of Bio- and Environmental Energy, Egyetem tér 1. 4030 Debrecen, Hungary, e-mail: jprokisch@agr.unideb.hu

EXAMINATION OF ZINC AND IRON MOBILIZATION WITH ACID TREATMENTS AND THE METAL CONTENT OF MAIZE AND STINGING NETTLE IN THE ACTIVE FLOODPLAIN OF THE RIVER TISZA

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In this paper the mobilization of zinc and iron was studied in soil samples from the Boroszló-kert Dead-Tisza region. Besides the determination of the soil characterizations, the effects of different acid treatments on the metal mobilization were examined with nitric acid in five concentrations and with three extraction times. HNO₃+H₂O₂ digestion and NH₄-acetate + EDTA extraction were also carried out.
Moreover, the metal uptake of two plant species (Zea mays from ploughlands, and Urtica dioica L. from orchards) was also studied. The decrease of pH caused significant metal mobilization, and the change of the pH is closely related to the soil properties, especially to the granulometric composition. Fe was less mobilizable than Zn. More metal was mobilized from the samples derived from ploughlands, and maize accumulated more Zn and Fe. However, the samples of ploughlands contained more CaCO₃ than the samples from orchards.