Registration Dossier

Ecotoxicological information

Toxicity to aquatic plants other than algae

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

ErC50 = 256 mg/l

Key value for chemical safety assessment

EC50 for freshwater plants:
256 mg/L
EC10 or NOEC for freshwater plants:
25.6 mg/L

Additional information

Acid Red 097:1 is a multiconstituent substance composed by the acidic and the sodium salt forms of the same structure. The test was performed on the sodium salt of the Acid Red 079:1. The results on the tested substance are the following:

Growth rate inhibition (ErC50) and yield inhibition (EyC50) for the endpoint frond numbers was estimated to be 256 – 2560 mg/l nominal concentration.

Growth rate (NOErC) and yield (NOEyC) for the endpoint frond numbers were 25.6 mg/l nominal concentration, as determined by Dunnett's test.

Growth rate inhibition (ErC50)for the endpoint dry weight was estimated to be 256 – 2560 mg/l nominal concentration

Yield inhibition (EyC50) was estimated to be 25.6 – 256 mg/l nominal concentration.

Growth rate (NOErC) and yield (NOEyC) for the endpoint dry weight were < 25.6 mg/l nominal concentration, as determined by Dunnett's test.

Considering the high similarity between the structures and the composition of the substance, , Acid Red 097:1 is expected to show the same toxicity to aquatic plants as the sodium salt form.

 

According to the CLP Regulation (EC) n. 1272/2008, 'acute (short-term) hazard’ means for classification purposes the hazard of a substance or mixture caused by its acute toxicity to an organism during short-term aquatic exposure to that substance or mixture.

The result on aquatic plants confirm no concern for the aquatic compartment, therefore no classification is warranted under the CLP Regulation.