Registration Dossier
Registration Dossier
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EC number: 939-382-7 | CAS number: -
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
EC50 > 1000 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater plants:
- 1 000 mg/L
- EC10 or NOEC for freshwater plants:
- 10 mg/L
Additional information
The results reported in the Lemna study on Similar substance 01 (Caduff, 2012) confirm the non-toxicity of the dye that is a structural analogue of Direct Black 22 (DBk22).
On the contrary in the study on aquatic algae (Riva, 2000) some adverse effects on growth inhibition were recorded.
The differences in outcomes of the two studies are probable due to the shading effects of coloured water in the algae test; in this case is not clear if the results obtained are true toxic effects of substances or if are effects due to the decrease of light available for the plant.
From this point of view the results recorded in Lemna study are more reliable, considering the structural analogy of the two dyes, DBk22 is expected to be no toxic to aquatic plants.
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