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EC number: 403-530-4 | CAS number: 129423-54-7 PV-ECHTGELB HGR
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The 72-h toxicity to algae (Desmodesmus subspicatus) at its maximum solubility (90 mg/l) did not cause inhibition - toxic effects, but there was observed the opposite effect – a stimulation of growth. No effective – inhibition concentrations could be calculated. The study was conducted by using OECD 201 in accordance with GLP.
Key value for chemical safety assessment
Additional information
The study was conducted as per GLP standards in compliance with OECD 201.The study was considered as reliable without restrictions to be used as a key study for C&L purposes.
The results show that the substance at its maximum solubility in the laboratory doesn’t cause inhibition - toxic effects, but there was observed the opposite effect – a stimulation of growth. This phenomenon is most likely due to the fact that algae utilize – metabolize the chemical (such as an additional source of nutrients), and it consequently causes its faster growth. Algae utilize most likely nitrogen, which is located in the dye molecule. There can be found a couple of scientific papers supporting that some algae can play a direct role in biodegradation of number of azo-dyes to some extent. This could also confirm the fact, that the test compound used in this study at defined highest test concentration can be characterized as non- toxic to green alga Desmodesmus subspicatus.
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