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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 members of this category are gases at standard temperature and
pressure and will predominantly partition to the atmosphere, which will
limit their aquatic toxicity. Consequently, conducting aquatic
ecotoxicity tests on these streams is technically difficult and based on
exposure estimates the test is not relevant.
Due to the difficulty associated with conducting aquatic toxicity tests
on these streams, experimental data are not available for the members of
this category. In the absence of measured data, the use of QSAR to
predict the ecotoxicity of representative constituents of these streams
is an appropriate technique for aquatic toxicity and it is more
appropriate to consider the toxicity of representative constituents of
ECOSAR v.1.11 (Epi Suite 4.1) has been used as key QSAR. 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), and
Propane, 2-methyl- (CAS 75-28-5).
The model predicted EC50 for short-term toxicity of representative
constituents to aquatic algae and cyanobacteria to range from 12.405
mg/L to 47.248 mg/L, whereas the chronic value for long-term toxicity to
aquatic algae and cyanobacteria was predicted to range from 3.459 mg/L
to 10.932 mg/L.
The ECOSAR class program has been developed primarily for the evaluation
of neutral organic compounds and organic classes with excess toxicity.
The QSARs in the ECOSAR program are developed for chemical classes based
on measured test data that have been submitted by industry or they are
developed by other sources for chemicals with similar structures, e.g.,
phenols. Using the measured aquatic toxicity values and estimated Kow
values, regression equations can be developed for a class of chemicals.
Toxicity values for new chemicals may then be calculated by inserting
the Kow value into the regression equation and correcting the resultant
value for the molecular weight of the compound.
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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