engleski

Heavy metals in alluvial sediments of the Drava River

The objectives of this study have been specified assessment of geochemical background before industrial revolution and evaluation of anthropogenic influence on sediment and soil pollution in the Drava valley and determination of the spatial distribution of heavy metals in soils on alluvial deposits of the river Drava downstream from Austrian – Slovenian border to the confluence of Rivers Mura and Drava. The 134 sampling location were defined. In each sampling point topsoil (0-5 cm) and bottom soil (20-30 cm) and also 30 samples of river sediments were collected. Analysis for 41 chemical elements was performed. Based on a comparison of statistical parameters, spatial distribution of particular elements and results of factor analysis, three natural and one anthropogenic geochemical associations were identified. Natural geochemical associations Al-Fe-K-Co-Cr-Cu-Li-Ni-Rb-Sc-Th, Ti-Ce-La-Nb-Ta and Ca-Mg-Sr are influenced mainly by lithology. An anthropogenic association As-Ba-Cd-Mo-Pb-Sb-Zn is the result of historically zinc and lead mining and smelting on river Drava watershed. In whole studied area c. 133 km2, is critically polluted with heavy metals, especially with zinc, according to the Slovenian and Croatian legislations.

geochemistry; alluvial sediments; heavy metals; multivariate statistics; River Drava

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