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Granulometric and chemical composition of the Sava river sediments upstream and downstream of the Krsko nuclear power plant

Total concentrations of 13 elements (K, Ca, Ti, Cr, Mn, Fe, Cu, Zn, Rb, Sr, Y, Zr, Pb) in the size-fractionated Sava river sediments upstream and downstream of the Krsko nuclear power plant together with metal speciation within bulk sediment have been investigated. Trace metals generally increase with decreasing particle size, however because of entrapment of organic matter in the 0.63-1 mm fraction, concentrations in coarser sediment fraction are higher than expected. Exchangeable Pb, Zn, Cu, Mn, Cr and Fe are generally found to represent a negligible fraction of the total metal concentration of bulk sediment. Combined rubidium and organic matter normalization of the Zn, Pb and Cu concentrations, which was applied on the minus 0.063 mm fraction, indicated three potential sources of contaminants.

river sediments ; heavy metals ; EDXRF ; organic matter ; normalization ; sequential extraction ; river Sava

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