Registration Dossier

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

EC50 > 100 % v/v saturated solution, NOEC = 100 % v/v saturated solution.

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

Due to the lack of details in the available study on Disperse Blue 073, a read across approach was used in order to complete the assessment for toxicity to aquatic algae. A detailed description of the read across chosen is reported in section 13.

Two studies were available.

In the first study (Dystar, similar substance 1), aquatic algae, i.e. Scenedesmus subspicatus, were exposed to test substance for 72 hours. Only a short abstract was available. Observed parameters were biomass as fluorescence, curve integrated and growth rate at the end of the test. Reported concentrations refer to test substance. The effect levels, based on biomass, were the following: EC10 = 3.1 mg/l, EC50 = 19 mg/l and EC90 = 115 mg/l; while effect levels, based on growth rate, were as follows: EC10 = 18 mg/l, EC50 = 330 mg/l and EC90 > 330 mg/l.

In the second study (Huntsman, similar substance 2), aquatic algae, i.e. Pseudokirchneriella subcapitata, were exposed to Similar Substance 01 for 72 hours using a nominal concentration of 100 % v/v saturated solution. In principle, this setup may be associated to a limit test. No toxic effects were seen at the highest attainable concentration.