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EC number: 205-597-3
CAS number: 143-28-2
No toxicity is expected at the limit of solubility (expert judgement)
No reliable measured data are available for long-term toxicity of
(z)-octadec-9-enol to fish.
In an expert statement based on ecotoxicological information available
on the alcohols category no toxicity is expected at the limit of
The only reliable test data that provide an indication of long-term
toxicity to fish are for 1-octanol, branched 1-pentadecanol and
The result from Pickering et al. is expressed relative to nominal
exposure concentrations and it is significant to note that measured
concentrations declined by >90% over the period between media renewals
(not specified in the source document). The true toxicity is therefore
likely to have been greater than that expressed due to the observed loss
of test substance concentration in the old media. Additionally, the
duration of this test is too short for it to be considered a true
The result from ABC is expressed relative to the arithmetic mean of
measured concentrations; it should be noted that measured concentrations
may vary as much as 10-fold in the same treatment level.
The test result from Wildlife International is expressed relative to
arithmetic mean measured concentrations. Measures were taken to prevent
significant biodegradation losses of substance in the test system.
Measured concentrations were within 80% of nominal concentrations.
These three test results do not provide sufficient data to determine a
trend in long-term toxicity across the category. However, short-term
data for fish and invertebrates indicate that the toxicity of linear
alcohols decreases with increasing chain length and that alcohol’s with
chain lengths ≥C13 are not toxic to fish, and those with chain lengths
≥C15 are not toxic for invertebrates, at their solubility limit.
Invertebrates appear to be rather more susceptible than fish in
short-term tests and it is reasonable to assume that a similar
relationship exists in long-term tests.
Long-term invertebrate (Daphnia) toxicity data for a linear
alcohol with a carbon chain length of C15 show it to be toxic at a
concentration below its solubility limit (Schaefers, 2005). However data
for a C18 linear alcohol show it to be non-toxic at its solubility limit
(Guhl, 1992). Schaefers et al (2009) have analysed these data and
concluded that linear alcohols with carbon chain lengths >C15 are not
toxic to invertebrates at their solubility limit. Given the relative
susceptibilities of fish and invertebrates in short-term tests it is
reasonable to conclude that alcohols with carbon chain lengths >C15
would also not be toxic to fish in long-term tests.
Testing for long term toxicity to fish is not considered necessary
A recent long-term toxicity test has been carried out with the
structurally analogous substance decan-1-ol. There was intensive method
development to attempt to overcome very significant biodegradation
losses of substance in the test system. Whilst testing is not
technically impossible, it requires very significant efforts which are
disproportionate to the need for data.
The freshwater PNEC has been derived from the data with long-term
toxicity to invertebrates (Daphnia). The three available NOEC
values for toxicity to fish indicate that they are in the range of the
NOEC values determined in the long-term invertebrate tests. The risk
characterisation ratios (RCRs) based on the PNECfreshwater derived from
the long-term toxicity to invertebrates data are <1, therefore no
further testing is considered necessary.
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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