Registration Dossier
Registration Dossier
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EC number: 605-104-5 | CAS number: 157577-99-6
Endpoint summary
Administrative data
Description of key information
Acid Black 234 is classified as Aquatic Chronic 3 (H412) according to the CLP Regulation (EC 1272/2008).
Additional information
Adequate chronic toxicity data are not available for Acid Black 234, therefore the aquatic toxicity assessment and classification are based mainly on the short-term toxicity data available.
Despite Acid Black 234 has a log kow lower than 4 (indicating a low potential for bioaccumulation), it is not ready degradable.
According to the CLP Regulation (EC 1272/2008), acute aquatic toxicity is normally determined using a fish 96-hour LC50 , a crustacean species 48-hour EC50 and/or an algal species 72- or 96-hour EC50; nevertheless it is also specified in the Regulation that data on other species (e.g. Lemna spp.) shall also be considered if the test methodology is suitable. These species cover a range of trophic levels and taxa and are considered as surrogate for all aquatic organisms.
Data are available for fish on similar substance 1, Daphnia magna and Lemna minor on Acid Black 234.
According to the CLP Regulation (EC 12720/2008) criteria for the identification of the classification categories for hazardous to the aquatic environment, the short-term toxicity to fish fixed the short-term effect level on fish > 120 mg/l; the Lemna study the EC 50 was set at 22.1 mg/l for dry weigh and the short term toxicity to acquatic invertebrates, the 48-hour EC50 was 58.9 mg/l.
The outcomes of the tests performed on the three trophic levels suggest that Lemna was the most sensitive species, thus the classification has to be based on the short-term toxicity to acquatic plants other than algae. The results of the Daphnia test anyway confirm the range of the classification, suggested by the Lemna test.
In conclusion, Acid Black 234 is classified as Aquatic Chronic 3 (H412) according to the CLP Regulation (EC 1272/2008).
In the risk assessment calculations, the lower value of EC50 found for Lemna (22.1 mg/l) has in any case be taken as conservative value for PNEC calculations.
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