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Toxicity to aquatic algae and cyanobacteria

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Aquatic toxicity studies of fatty acids, tall-oil, manganese salts are not available. Thus, read-across to the assessment entities soluble manganese substances and fatty acids, tall oil is applied since manganese cations and fatty acid anions determine its fate and toxicity in the environment. Reliable data indicate that the moiety of ecotoxicological concern are manganese cation though manganese is an essential trace nutrient required for the photosynthetic process in plants. Two reliable studies for toxicity on algae are available and the lowest effect concentrations are the 72-h NOErC and ErC50 values of 0.325 mg Mn/L and 19.8 mg Mn/L for the inhibition of growth rate of Desmodesmus subspicatus. Data for fatty acids, tall oil point to a low (if any) toxic a low toxic potential to freshwater algae. 

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