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EC number: 252-161-3
CAS number: 34708-08-2
Table 1. Test results
24 hr EC50 29 mg/l (nominal)
A 24 hour EC50 value of 29
mg/l and NOEC of 10 mg/l (nominal) have been determined for the effects
of the registered substance on mobility of Daphnia magna. In view
of the test media preparation method and exposure regime it is likely
that the test organisms were exposed to a mixture of the parent
substance and its hydrolysis products.
The exposure duration during
this test was only 24 hours rather than 48 hours as recommended by OECD
TG 202. It is therefore possible that the toxicity of the substance
could have been underestimated and the EC50 value may have been lower,
had the test duration been 48 hours. A
test proposal is in place for a long-term toxicity to aquatic
invertebrates study OECD TG 211. In this study it is proposed to conduct
a Dose Range Finding study, the results of which will be compared with
the current short-term aquatic invertebrate toxicity study by TNO (1990).
The test solution was
prepared using tert-butyl alcohol (TBA) as a solvent. The recommended
solvent concentration (100 mg/l) was exceeded during the test, with TBA
at a concentration of approximately 250 mg/l (based on a density of
0.781 g/ml). However, according to the REACH registration dossier for
TBA (2-methylpropan-2-ol), the lowest E(L)C50 value is 933
mg/l for invertebrates. It is therefore unlikely that TBA significantly
affected the results of the test.
Above a concentration of
approximately 100 mg/l, cross-linked condensation products could
potentially form over time in the aqueous test media. No evidence of
undissolved material (parent substance or precipitated products) has
been reported in the study report for this test.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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