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Endpoint summary

Additional information

Alkylated naphthalene, EC Number 700-826-8, is a close structural analog of the Alkylnaphthalene being assessed in this dossier. The substances have similar chemical and physical properites and therefore the aquatic toxicity testign data, where appropriate and available for Alkylated naphthalene, EC Number 700-826-8, can be used as read-across to the alkylnaphthalene in this dossier.

Read across study reports, have been available for acute tests with fish, invertebrates and algae. Long-term aquatic toxicity tests were waived. The results are summarized as below:

The fish acute toxicity test was performed according to OECD guideline No. 203 under GLP compliance. The result showed the test substance induced no visible or lethal effects in carp at 0.020 mg/l, being the average measured exposure concentration in a WAF prepared at a loading rate of 100 mg/l (NOEC). The 96 h-LC50 exceeded 0.020 mg/l, being the average measured exposure concentration in a WAF prepared at a loading rate of 100 mg/l.

The acute toxicity test with Daphnia magna was performed according to OECD guideline No. 202 under GLP compliance. The result showed the test substance did not induce acute immobilisation of Daphnia magna at 0.62 mg/l, being the average measured concentration in a WAF prepared at a loading rate of 100 mg/l after 48 hours of exposure (NOEC). The 48 h-EC50 exceeded 0.62 mg/l, being the average measured concentration in a WAF prepared at a loading rate of 100 mg/l.

Algal growth inhibition test was performed according to OECD guideline No. 201 under GLP compliance. The result showed no reduction of growth rate or inhibition of yield was recorded at any of the WAFs of Alkylated naphthalene tested. Both the EC50 for growth rate reduction (72 h-E_RC₅₀) and the EC50 for yield inhibition (72 h-E_YC₅₀) exceeded 0.2 mg/l, being the Time Weight Average concentration in a WAF prepared at a loading rate of 100 mg/l.

Also toxicity towards microorganisms was investigated with a loading rate of 1000 mg/L (3h exposure), resukting in no effects on growth. Thus the NOEC was set to 1000 mg/L in this study, showing to toxicity towards sludge bacteria.

Due to the poor water solubility of test substance (below 3.75 μg/L), the exposure to the aquatic compartment is negligible. In addition, it is sufficient for the classification and PBT/vPvB assessment based on available information. Thus, no further long-term aquatic toxicity tests will be necessary.