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Acute toxicity of the test substance to aquatic organisms was investigated for different trophic levels (algae, invertebrates and fish). The most sensitive group were fish which exhibited an LC50 (96 h) of 0.16 mg/L in a semi-static test system. The EC50 (48 h) for Daphnia was 9 mg/L and was also established under semi-static exposure conditions. Concerning the toxicity to aquatic algae, the reported values are ECr50 (72 h) > 0.4 mg/L and NOEC (72 h) = 0.021 mg/L.