AbstractFor judging the behaviour of tensides in water there are required not only the results or the conventional methods of determining their biochemical degradability and toxicity, but also their distribution in the sediment as well as in animal and vegetable products. Very important are properties as adsorbability, persistence, sequence of stations in the nutrient chain (bioaccumulation), relations of structure and actions and dose‐effect relations. In these investigations also changed effects of combinations of substances with tensides have to be taken into account; a power plant water and Baltic Sea sediment being used as examples. From the variety of tested possibilities of analysing very small amounts of tensides mainly the infrared spectroscopy and the thin‐layer chromatography have proved to be successful. By means of special procedures, the detection and the quantitative determinability can be shifted into the nano‐ and picogram
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