Registration Dossier
Registration Dossier
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EC number: 216-732-0 | CAS number: 1655-29-4
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
According to the OECD Guideline for Testing of Chemicals No. 201, no toxic effects against algae were observed at a limit test concentration of 100 mg/L (active ingredient) under exposure conditions. Based on growth rate for naphthalene-1,5-disulfonic acid an 72h-EC50 of > 100 mg/L and a72 h-NOEC of >= 100 mg/L was observed.
The results are expressed in terms of nominal concentrations. Effective concentrations ranged from 99.9 % to 100.8 % of nominal values of the active ingredient at 0 hours, and from 98.4 % to 101.3 % of nominal values of the active ingredient at 72 hours.
Read-across justification:
Disodium-naphthalene-1,5-disulphonate (CAS 1655-29-04) is the sodium salt of naphthalene-1,5-disulphonic acid (CAS 81-04-9). It can be assumed that sodium is not ecotoxicologically relevant related to the requirements of concern. At diluted aqueous conditions the dissolved disodium-naphthalene-1,5-disulphonate will have no different behaviour as the parent acid. Therefore, the results obtained with naphthalene-1,5-disulphonic acid were used for the read-across approach.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 100 mg/L
Additional information
The reported values were:
72h-EC50 of > 100 mg/L and a72 h-NOEC of >= 100 mg/L
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