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All available short-term studies show effect concentrations > 8.5 mg/L (D. galeata exposed to 5 -methyl-1H-benzotriazole) indicating a low acute toxicity towards aquatic organisms. Lowest available long-term effect values were found in studies with Daphnia galeata (EC10(21d) =0.97 mg/L (1H-Benzotriazole), EC10(21d) =0.4 mg/L (5 -methyl-1H-benzotriazole)), Desmodesmus subspicatus (EC10(72h) =1.18 mg/L (1H-Benzotriazole), EC10(72h) =2.86 mg/L (5 -methyl-1H-benzotriazole)), and Lemna minor (EC10(7d) =3.94 mg/L (1H-Benzotriazole), EC10(7d) =2.11 mg/L (5 -methyl-1H-benzotriazole)) indicating a moderate toxicity to aquatic organisms.

In summary, fish is considered as the least sensitive trophic level and therefore no further testing on long-term effects in fish has been proposed. Furthermore, results from testing on microorganism indicate a medium hazard to STPs.

Based on the results from the chronic studies with D. galeata 1H-Benzotriazole, Tolyltriazole as well as their conjugated sodium salts are classified as hazardous to the aquatic environment category Chronic 2 according Regulation (EC) No 1272/2008.