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EC number: 252-161-3
CAS number: 34708-08-2
The registered substance is
susceptible to hydrolysis reactions, as described in Section 5.1.2 of
IUCLID. Therefore it is likely that, in the available aquatic studies,
the test organisms were exposed to a mixture of the hydrolysis products
of the substance and the test substance.
A functional group
associated with ecotoxicity by a specific mode of action (thiocyanate)
is present in both the registration substance and the silanol hydrolysis
product, and the effects seen are attributed to this. It is therefore
reasonable to conclude that both the parent and hydrolysis product could
contribute to any effects observed.
Reliable short-term toxicity test
results are available for freshwater fish (Danio rerio, tested as Brachydanio
rerio), invertebrates (Daphnia magna) and algae (Desmodesmus
subspicatus, tested as Scenedesmus subspicatus). The relevant
short-term values are:
Fish: LC50 (96 h):
between 10 and 18 mg/l (nominal), expressed in terms of parent.
Invertebrate: EC50 (24
h): 29 mg/l (nominal), expressed in terms of parent.
Algae: ErC50 (96 h):
160 mg/l; NOEC: 32 mg/l (nominal), expressed in terms of parent.
Reliable long-term toxicity test
results are not available. A
test proposal is in place for long-term toxicity to aquatic
invertebrates. The need for long-term toxicity to fish data is waived
and will be reviewed once the long-term toxicity to invertebrates study
results are available.
An activated sludge
respiration inhibition 3 hour EC50 value of 130 mg/l and an EC10 value
of 4.2 mg/l (loading rate, nominal) were determined in a reliable study.
It was not possible to determine a NOEC value in the study (NOEC was
<1.0 mg/l (loading rate, nominal)).
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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