Abstract
In‐vivo enzymatic activity tests have been used for the characterization of sediments. Sediment samples representing three typical situations on the river Elbe and one reference site on the river Spree were investigated from March to October 1993. Fresh sediments and pore water were analyzed for their dehydrogenase and proteolytic enzymatic activities, respectively. The dehydrogenase and protease activities varied depending on sampling site, date and kind of sample. From the mean values of the dehydrogenase activities over the whole period of investigation significant differences between the sampling sites became evident. The dehydrogenase activity of pore water rather than that of the whole sediment is suitable to differentiate between anthropogenically influenced and not influenced sites. The dehydrogenase activities in the contaminated samples were extremly higher than those in the uncontaminated samples. In contrast to this, samples from the uncontaminated sites showed a considerably higher specific p...
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