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The test substance is with high probability acutely not harmful to aquatic organisms.

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

The test 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 can be used to cover this endpoint required under REACh if no data for the original test substance is available.

In a guideline study following OECD guideline 203 the acute toxicity of the substance to fish was determined. Test fish of the species Brachydanio rerio were exposed to the substance for 96 hours in a static test system. At test termination a LC50 of > 5000 mg/l based on nominal test substance concentrations was determined [Hoechst AG, 1988].

A study on the toxicity of the substance to Daphnia magna has been conducted according to OECD guideline 202 following a static test system setup [BASF SE, 2012]. At test termination after 48 h no toxicity was observed up to the limit of solubility of the test substance (EC50 > 0.0065 mg/L; measured).

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.

The acute toxicity of the test substance to aquatic plants has been examined in a GLP guideline study according to OECD 221 with the test species Lemna gibba [BASF SE, 2012]. At test termination after 7 d, an ECr50 > 0.007 mg/L (measured) relating to growth rate (frond rate and dry weight, respectively) was determined.

The changes in the respiration rate of activated sludge in presence of the test substance were investigated in a guideline study according to OECD 209 and ISO 8192, with activated sludge as inoculum. At test termination after 30 minutes effect concentrations > 1000 mg/L (nominal) were determined [BASF AG 1998].

All tests were run with concentrations above the water solubility of the test substance and its analogues, respectively. Thus, no effects in the range of the water solubility of the substance were determined.

The hazard assessment of the substance reveals neither a need to classify the substance as dangerous to the environment, nor it is a PBT or vPvB substance, nor are there any further indications that the substance may be hazardous to the environment. Therefore, and for reasons of animal welfare long-term toxicity testing in fish and aquatic invertebrates is not provided.