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LC50(96h) Oncorhynchus mykiss = 63 mg/L (measured)

EC50(48h) Daphnia magna = 39 mg/L (nominal)

ErC50(72h) Desmodesmus subspicatus = 26 mg/L (measured); NOECr(72h) Desmodesmus subspicatus = 6 mg/L


No chronic data on tBMA is available. However, for the structurally related nBMA (97-88-1) and MMA (80-62-6) reliable chronic tests were conducted on Daphnia magna, indicating no chronic hazard. For MMA a supporting chronic test with Danio rerio was also conducted.


NOECreproduction(21d) Daphnia magna = 1.1 mg/L (measured)

NOECreproduction(21d) Daphnia magna = 2.6 mg/L (measured)


NOECreproduction(21d) Daphnia magna = 37mg/L (measured /geometric mean)

NOEC (35d) Danio rerio = 9.4 mg/L (nominal)


Furthermore, nBMA shows no harmful effects towards aquatic microorganisms (EC20 = ca. 1000 mg/L, domestic activated sludge, OECD TG 209). Therefore, the inhibition of the degradation activity of activated sludge is not anticipated when tBMA is introduced into biological treatment plants in appropriately low concentrations.