HEAVY METAL SEDIMENT LOAD FROM THE CITY OF STOCKHOLM

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Abstract

A transect of upstream lake sites and downstream coastal sites surrounding the city of Stockholm, capital of Sweden, were investigated for heavy metals in sediments. Concentrations of Cd, Cu, Hg, Pb and Zn increased close to the city. In the most central areas of Stockholm, sediment deposition was increased about 5-fold for Cd, Cu, Hg and Pb and 3-fold for Zn, as compared to the surrounding areas. The sediment load from the city was estimated by correcting for a background concentration. It can be concluded that most of the load of Hg and Pb was trapped in the sediments close to the city while Ni, Cu, Cd and Zn to a higher degree were transported through the archipelago towards the Baltic Sea.

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