Registration Dossier

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Exact acute toxicity values could not be achieved because the chemical is insoluble in water and organic solvents. One report is available concerning the ecotoxicity of the Carbon Black Spezialschwarz 4 to Daphnia magna. This gas black is insoluble in water, and gives an acidic pH in aqueous suspension. As a preliminary range-finding study showed that the Daphnia magna were possibly physically hampered by particles, and as the presence of particulate matter is not recommended in the OECD TG 202 for Daphnia tests, the final test was carried out on a water accommodated filtrate. However, the pH of the filtrate was acidic after accommodation with the higher carbon black concentrations. At a carbon black concentration of 10,000 mg/L, the pH was lower than the lower limit of pH 6 recommended in OECD TG 202, and effects were noted on both mobility and condition. The 24 hour EC50 (mobility) was between 5600 mg/L and 10,000 mg/L. The condition of the Daphnia at 5600 mg/L was visually impaired, leading to a reported 24 hour NOEC, based on condition, of 3200 mg/L. 
Although a test time of 48 hours is now recommended for acute Daphnia tests, this would have no effect on the pH of the solutions, which is suggested to be the main cause of toxicity. Thus the study shows that an aqueous invertebrate EC50 of greater than 5600 mg/L, or a NOEC of 3200 mg/L, applies for the carbon black solids used to prepare water accommodated filtrates.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
5 600 mg/L
EC50/LC50 for marine water invertebrates:
5 600 mg/L

Additional information