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EC number: 270-790-1
CAS number: 68478-10-4
A complex combination of hydrocarbons obtained by the distillation of debenzenized light steam-cracked naphtha. It consists predominantly of cyclic olefinic and aromatic hydrocarbons having carbon numbers predominantly in the range of C8 through C16 and boiling in the range of approximately 130°C to 300°C (226°F to 572°F).
BCF have been calculated using for various
representative components of these streams. Using a log Kow range of
2.68 to 6.96, the calculated values range from 4 to 2010 dimensionless
(based on BCFBAF model) and 4.9 - 552 dimensionless (based on the
regression based model).
The key value for the chemical safety assessment
is the median BCF derived.
measured BCF is not available for any streams in this category. As the
log Kow of some category members is >3 the bioaccumulation endpoint
cannot be waived. However, ECHA's Guidance on Information Requirements
and Chemical Safety Assessment R7c Endpoint Specific Guidance (2008)
indicates that before commissioning a new vertebrate test alternative
sources of data on the bioaccumulation potential of a chemical should
values have been calculated from representative substances. Nonpolar
substances have been shown to have a linear relationship between log Kow
and BCF in the log Kow range 1 - 6. Several QSAR have been developed
that calculate the BCF of non-polar, hydrophobic compounds on the basis
of their log Kow (e.g. Veith et al, 1979 and USEPA, 2008). BCFBAF v3.0
(USEPA 2008) has been used to calculate the BCF for respresentative
substances of the streams since most of the substances fall within the
applicability domain of the model and this has been used as the key
method of Veith et al (1979) was used to calculate the BCF as a
supporting study. Parabolic method has been used to calculate a BCF for
substances with a log Kow >6.
the US EPA (2008) model, the calculated BCF values for representative
components of the streams in this category are in the range 10 -18000.
The latter figure comes from a C15 olefin, all other BCF values for the
category fall within the range 10 -174. Using the Veith et al (1979)
method, the calculated BCF for representative components of the streams
in this category are in the range 36 - 45928. All of the components
except a C15 olefin were within the range 36-427. With the exception of
the C15 olefin, the mean BCF value for representative components of the
streams in this category is 162 (unitless) and this has been used to
complete the 'key value for chemical safety assessment'.
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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