The toxicity of 5 new cationic surface active substances (CSAS) - imidazolium chlorides against freshwater organisms - was evaluated. Tests were conducted with the green algae Scenedesmus quadricauda, the fish Lebistes reticulatus and the crustacean Daphnia magna. European Classification was used for the evaluation of adverse effects of investigated preparations. Two of them were classified as very toxic, the others were toxic. For genotoxic effect evaluation Bacillus subtilis rec-assay was performed. It was shown that none of the examined surfactants possessed genototoxic properties.
Numerous brackish estuarine water bodies are situated in the Polish Baltic Coastal Zone, including smaller and bigger lakes like Sarbsko, Łebsko, Gardno, Wicko, Kopań, Bukowo, Jamno, Resko Przymorskie, Liwia Łuża, Koprowo and Wicko Wielkie. Despite a similar genesis and geomorphological type, these lakes are characterized by different hydrological and hydrochemical conditions, determined by the predominance of terrestrial or marine factors. The origin of Polish coastal lakes and transboudary water bodies is closely related to the history of the Baltic Sea and the last glaciation. Coastal brackish waters have been inhabited by both marine and freshwater organisms.
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