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Abstract
An analytical method is described for the multielement determination of water samples using the monostandard activation analysis. The method is applied to investigate the behaviour of trace inorganics in an urban sewage treatment plant. The concentration of trace elements in sewage is assessed by an appropriate sampling of effluent: the sewage collected either from the inflow or the outflow of the plant is centrifuged and filtered with a 0.45-μm micropore filter in order to distinguish sewage sludges, suspended solids and effluents. Based on the analytical results of suspended solids and effluents, the behaviour of trace elements in the cleaning process is interpreted with respect to their individual chemical properties.