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EC number: 204-066-3
CAS number: 115-11-7
In accordance with column 2 of REACH Annex IX, the long term testing on fish does not need to be conducted as the chemical safety assessment according to Annex I has not indicated a need to investigate further the effects on aquatic organisms. For butenes, the calculated 30 day NOEC for fish is 2.05 mg/L to 2.67 mg/L. This range was derived from the members of the butenes category: but-1-ene (CAS 106-98-9), 2-butene (CAS 107-01-7) and 2-methylpropene (CAS 115-11-7) using QSAR estimates (Nabholz and Mayo-Bean 2009).
Butenes are gases at standard temperature and
pressure and are expected to partition primarily to air, therefore
aquatic toxicity tests may not be relevant. In addition, it is
technically difficult to maintain aqueous concentrations of gases for
Measured data are not available for butenes
for this endpoint. Due to the practical difficulties associated with the
ecotoxicity testing of gases (i.e. maintaining exposure concentrations),
the use of QSAR toxicity estimates is an appropriate alternative. The
ECOSAR model is a reliable and appropriate QSAR model to apply to
butenes as it is based on a related chemical dataset that calculates the
toxicity of neutral organic hydrocarbons whose mode of action is
non-polar narcosis. The endpoint calculated here is therefore a
reasonable estimate of the baseline toxicity.
A QSAR (ECOWIN v1 ECOSAR, Nabholz and
Mayo-Bean 2009) has been used to give an indication of the toxicity of
butenes to freshwater fish. The calculated 30 day ChV are 3.23 mg/L for
but-1-ene, 3.77 mg/L for 2-butene and 2.90 mg/L for 2-methylpropene.
These ChV values correspond to 30 day NOECs of 2.29 mg/L, 2.67 mg/L and
2.05 mg/L respectively.
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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