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EC number: 204-066-3
CAS number: 115-11-7
This endpoint can be waived on the basis that butenes have a low potential for adsorption, based on a log Kow of less than 3. The calculated adsorption coefficients for butenes range from 97.7 to 117.5. 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 the equation in the TGD (EC 2003).
In accordance with column 2 of REACH Annex
VIII, the adsorption/desorption study does not need to be conducted as,
based on the physico-chemical properties, the butenes category members
can be expected to have a low potential for adsorption (the butenes have
a log octanol water partition coefficient less than 3).
However, the adsorption coefficient has been
calculated according to the appropriate equation in the TGD (EC 2003)
and is considered reliable for this endpoint. The estimated adsorption
coefficient, Koc, of 2-butene is 97.7 and the log Koc is 1.99. The
estimated adsorption coefficient, Koc, of but-1-ene is 109.6 and the log
Koc is 2.04. The estimated adsorption coefficient, Koc, of 2
-methylpropene is 117.5 and the log Koc is 2.07. The mean of the
adsorption coefficient values for the butenes is 108.3 (log Koc of 2.03)
and this has been used to complete the 'key value for chemical safety
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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