Registration Dossier
Registration Dossier
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EC number: 273-468-9 | CAS number: 68971-49-3
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
LC50 (96 h) Zebra fish > 100 mg/l
Key value for chemical safety assessment
Fresh water fish
Fresh water fish
- Effect concentration:
- 100 mg/L
Additional information
The toxic potential of the substance to fish after a short-term exposure was evaluated considering data on the substance itself and on the similar substance OB 3a-MSA, in a weight-of-evidence approach. Justification for Read Across is given in Section 13 of IUCLID..
Two studies, performed according to OECD 203, were conducted on OB 3a-DSA, resulting in LC50 greater than 1000 mg/l (Ciba-Geigy Ltd. 1990 and Ciba-Geigy Ltd., 1995); only the summary of the test reports are available, thus the reliability cannot be confirmed. Nevertheless, the results are consistent and in agreement with the expected results for the category and they can support the endpoint as a weight of evidence, together with the results of the most similar substance within the category, OB 3a-MSA.
The additional tests here presented and following a weight of evidence approach, were performed on the analogous 3a-MSA. This substance can be considered the best representative within the category, since it has the same organic functionalities, a different sulphonation degree, but measured water solubility is higher than the analogous hexasulphonated, therefore a higher availability could be expected in the water compartment. The percentage and chemical identity of organic impurities are also very similar. The category Justification Report is attached to the section 13 of the dossier.
Furthermore, a prolonged semistatic assay over 14 days was conducted with Brachydanio rerio. Endpoints were mortality, signs of intoxication, length and weight. The nominal concentrations were 100, 316 and 1000 mg/l. There was no mortality and no difference in body weight at nominal concentrations of 100 and 316 mg/l. Only at 316 mg/l one fish showed slackening in movement (Bayer AG., 1992).
In conclusion, no fish acute toxicity is expected for the substance.
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