Heavy metal distribution in recent sediments of the Krka River Estuary — an example of sequential extraction analysis

Sediments of the Krka River Estuary on the eastern Adriatic coast have been analysed for trace metals after sediment fractionation by sequential leaching. Trace concentrations of Mn, Cu, Pb, Zn, Ni, Co, Cr, V and Ga have been determined by atomic emission spectroscopy. The distribution patterns of the investigated elements follow the expected geochemical partitionings, while minor variations may be caused by early diagenetic effects and variable sediment texture. Taking into account the natural background levels of the investigated elements, the sediments reflect, at present, no significant industrial pollution or anthropogenic input of trace metals into the estuary.