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EC number: 295-405-4
CAS number: 92045-23-3
A complex combination of hydrocarbons produced by the distillation of the products of a steam cracking process. It consists predominantly of hydrocarbons having a carbon number of C4, predominantly 1-butene and 2-butene, containing also butane and isobutene and boiling in the range of approximately minus 12°C to 5°C (10.4°F to 41°F).
The Koc for 1,3 -butadiene has been calculated based on the log Kow
using the Sabljic et al. (1995) method as set out in the Technical
Guidance Document (ECB 2003).
Log additional adsorption / desorption values for sediment, suspended
matter and soil are reported in the EU RAR (2002). The data are taken
from a regulatory review document and therefore, although the original
data have not been reviewed, the data are considered to be reliable. The
Risk Assessment Report is the result of in-depth work carried out by
experts in one Member State, the Commission Services, Industry and
public interest groups in accordance with Council Regulation (EEC)
793/931 on the evaluation and control of the risks of “existing”
substances following the methods laid down in Commission Regulation (EC)
1488/942 and the technical guidance document. The draft Risk Assessment
Reports are presented at a Meeting of Member State technical experts for
endorsement and peer-reviewed by the Scientific Committee on Toxicity,
Ecotoxicity and the Environment (CSTEE).
The members of this category are gases at standard temperature and
pressure and will predominantly partition to the atmosphere. The use of
QSAR to predict the soil adsorption coefficient of representative
constituents of these streams is an appropriate technique and it is more
appropriate to consider the soil adsorption of representative
constituents of these streams.
The representative constituents of the category studied and used as
supporting read-across are But-1-en-3-yne (CAS 689-97-4), But-1-ene (CAS
106-98-9), But-2-ene, cis- (CAS 590-18-1), But-2-ene, trans- (CAS
624-64-6), Buta-1,2-diene (CAS 590-19-2), Buta-1,3-diene (CAS 106-99-0),
Butane (CAS 106-97-8), Prop-1-ene, 2-methyl- (CAS 115-11-7), Propane,
2-methyl- (CAS 75-28-5).
The log Koc of representative constituents of this category has been
predicted using the EPISUITE v4.11 KOCWIN (2017) program, which uses
methodology described by Sahljic et al., (1995) and Meylan et al.
(1995). The predicted log Koc for this category ranged from 1.21 - 2.51
(Kow method) and 1.5 - 1.79 (MCI method).
In addition, values cited in EU RAR indicate that adsorption to soil and
sediment for 1,3 -Butadiene (CAS 106 -99 -0) is not likely to be
important. As the substance is a gas, it will preferentially partition
to and rapidly volatilize to the atmosphere.
For 1,3 -Butadiene (CAS 106 -99 -0), the
Koc was predicted to be 51.6 using the log Kow of 1.99. Log additional
adsorption / desorption values for sediment, suspended matter and soil
of 2.58, 5.16 and 1.03 L/kg respectively are reported here as reported
in the EU RAR, 2002.
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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