Registration Dossier
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EC number: 241-883-4 | CAS number: 17958-73-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
EC50 (72 h) > 100 mg/l
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
Additional information
The substance is part of the Stilbene Fluorescent Whitening Agents category, group 3.
Results on analogous tetrasulphonated sodium salt (CAS 16324-27-9) and dihydroxyethyl derivatives of the category of Stilbene Fluorescent Whitening agents are reported: the sodium (CAS 4193-55-9), the sodium/potassium salt (CAS 70942-01-7) and the tetrasulphonated sodium salt (CAS 16470-24-9).
The influence of the CAS 16470-24-9 on the growth of the green alga Scenedesmus subspicatus chodat was investigated. The study was performed according to the OECD Guideline 201 and based on the growth inhibition curve, the NOEC and the LOEC values were found to be 500 mg/l and 1000 mg/l, respectively (RCC Umweltchemie AG., 1990).
In the test performed on the CAS 70942-01-7 Green algae (Pseudokirchnerella subcapitata) was evaluated in the 72 hours screening test, according to the OECD guideline 201. A single dose was administrated at 100 mg/l, which caused the 2 % of the grown inhibition (Solvias AG., 1999).
In the test performed on the CAS 4193-55-9 in a 72 hours screening test, according to the OECD guideline 201, the EC50 resulted greater than 100 mg/l (Novartis Services AG, CH-Basel, 1997).
In the test on the CAS 16324-27-6 the acute toxicity to Green algae was assessed by a Limit-test with one test concentration of 100 mg/l, which caused a slight inhibition of algae growth (13.5 % for biomass, 4.0 % for growth rate) (Ciba-Geigy Ltd., 1996).
It can be concluded that no alga toxicity is expected also for CAS 17958-73-5.
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