1-hydroxy-4-[[4-[(methylsulphonyl)oxy]phenyl]amino]anthraquinone

Endpoint summary

Description of key information

Short-term toxicity tests are available for all the three tropic levels (fish, invertebrates, algae and microorganisms). The 48-hour TL50 for fish (Rainbow trout) is 450 mg/L, while the 48-hour EC50 in Daphnia magna is >100 mg/L. A study to investigate the toxicity of FAT 36038/J to algae is available, however the study did not take into account the adverse effects that may have been caused by the dark discoloration of the test medium as the test substance is an intense colored dye. The discoloration may lead to reduced light absorption and therefore to reduced photosysnthesis rates of the algae and thereby affecting the outcome of the study. Hence the study was disregarded. Instead a growth inhibition test on Lemna gibba has been performed, where the resulting NOEC and EC50 for growth rate and yield (for frond number and dry weight) on the basis of the nominal concentration of the test item were higher than 100 mg test item/L. This result is in line with the results of the toxicity studies with fish and daphnia, hence considered to be correct representation of the toxicity potential of FAT 36038 and is taken forward for the hazard and risk assessment. To invest long-term effects on the aquatic ecosystems, a daphnia magna reproduction test was performed. The EC10 for reproduction in Daphnia magna when exposed for 21 days was determined to be 0.01337 mg/L.

In an activated sludge respiration inhibition test a 3-hour IC50 value of >320 mg/L was observed. Based on the results obtained in all tests conducted, the test substance FAT 36038 can be considered as not toxic to aquatic environment and no classification is warranted.