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According to the REACH Regulation (EC n. 1907/2006), Annex VIII, Column 2, the study does not need to be conducted when the substance is found to be readily biodegradable and the applied test concentrations are in the range of concentrations that can be expected in the influent of a sewage treatment plant. Tris(ethyl acetoacetato-O1',O3)aluminium is ready biodegradable (ThCO2 > 60% in 28 days) and there is no concern for toxicity to microorganism of sewage treatment plant.