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Toxicity to aquatic algae and cyanobacteria

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Description of key information

With high probability acutely not harmful to aquatic algae.

Key value for chemical safety assessment

Additional information

The substance belongs to the category of perylene as indicated by its chemical core structure. Based on this structure and the chemical and biological stability of perylenes under environmental conditions data from structural analogue perylenes are used to cover this endpoint required under REACh.

The toxicity of the analogue substance CAS 4948-15-6 on aquatic algae was investigated in a GLP guideline study according to OECD 201 with Pseudokirchneriella subcapitata [BASF SE, 2012]. The substance had no observable inhibitory effect on algae growth up to its saturation limit in the test media and under test conditions. The EC50 value (based on growth rate after 72 h of exposure) was determined to be > 100 mg/L (nominal).

The inhibiting abilities of Perylen Schwarz/Black I (EC 479-300-2) and Perylen Schwarz/Black II (EC 475-310-6) to Pseudokirchnerella subcapitata were examined in GLP studies according to OECD guideline 201, respectively. After 72 h the EC50 value for Perylen Schwarz/Black I and Perylen Schwarz/Black II was determined to be > 100 mg/L based on the nominal concentration of the test substances (BASF AG 2006). No effect was observed up to the solubility limit of the test substance in water.

Overall, the available data illustrate the absence of adverse effects for members of the category up to a concentration of 100 mg/L. Therefore, all members of the category are assessed to be not toxic to aquatic algae and cyanobacteria.