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Fatty acids, C8-18 and C18-unsatd., reaction products with diethanolamine and propylene oxide is acutely toxic to aquatic organisms.

Additional information

Acute tests on all three trophic levels were performed to examine the aquatic toxicity of Fatty acids, C8-18 and C18-unsatd., reaction products with diethanolamine and propylene oxide (CAS 1000817-22-0). Algae turned out to be the most sensitive species revealing an EC50 (96h) of 2.14 mg/L. Thus, the substance is considered to be acutely toxic to aquatic organisms. Effects towards Daphnia were found in the same range providing an EC50 (48h) of 2.25 mg/L. Fish turned out to be less sensitive than algae and Daphnia. For fish the LC50 (96h) was 15.2 mg/L.

In addition, long-term toxicity data for all three trophic levels are available; however, direct and indirect exposure of the water compartment is unlikely due to its readily biodegradability. Therefore exposure in the environment over longer time periods is not to be expected. This is confirmed by the outcomes of the available long-term toxicity tests which revealed effect values in the same range than in the acute toxicity tests for fish (28d-NOEC = 1.4 mg/L) and algae (96h-EC10 = 1.46 mg/L). The long-term toxicity test with aquatic invertebrates did not show any effects up the highest tested loading rate of 20 mg/L.

Fatty acids, C8-18 and C18-unsatd., reaction products with diethanolamine and propylene oxide did cause low inhibition of respiration in a study according to OECD 209 with an 3h-EC10 of 720 mg/L. Thus, the overall potential to cause inhibition of activated sludge microorganisms is low and significant inhibition of the subsequent degradation process in sewage treatment plants is not expected.