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A regional survey of sewage sludge compositions was conducted in the Rhein-Sieg-Kreis, including the city of Bonn. Sludge samples were obtained from 28 treatment plants. The following metals and metalloids have been measured by AAS: Fe, Zn, Cu, Cr, Ni, Pb, Cd, Hg, As, Se. The concentrations of some trace metals were extremely high, in particular the toxic element Cadmium. Sources of environmental pollutions can be revealed by analysing sludge constituents.
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