GENERAL-CHARACTERISTICS AS WELL AS THE MO BILITY OF LEAD AND ZINC IN SOILS WHICH WERE TRANSFORMED BY URBAN AND INDUSTRIAL-IMPACT OF THE BRUCKTOR DISTRICT IN OBERHAUSEN (RUHR AREA)

This parer presents the results of Urbic Anthrosols from eight differe nt sites which contain partly alkalising material of technological ori gin in an urban-industrial area in Oberhausen. These results were then compared with those of tests taken on a nearby Cambisol from Oberhaus en. The pH-value of the profits with the deposit layers are almost in the alkaline range (highest pH = 9.8). More than 50% of the deposit la yers of the tested soils show a coarse texture with a high to very hig h content of gravel, ashes, cider, clinkers and mining waste. The soil s are deep enriched with fossilized and pyrolytic transformed carbon s ubstances which are recorded, as well as the recent humus, by using th e Lichter-felder-method to determine the Corg. From the substratum of the deposit layers Na, K, Mg and Ca were moved into deeper horizons wh ich could cause an increase in the pH-value there. The eight tested so ils partly show a high accumulation of heavy metals measured in the de posit layers of ashes. Unlike Na, K, Mg and Ca, it could not be shown that a transfer of mobile Zn and Pb into deeper layers of soil takes p lace. In spite of a lower background pollution the acidified Cambisol contains, in comparision to the eight tested soils, a clearly higher m obile Zn-content which could be transferred through the profile.