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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).
This category contains members with a carbon
number range up to C15. The model was run until the calculated aliphatic
PNEC was below the level of solubility. This occurred at a carbon number
of C13 and the aliphatic boiling point range 195-240°C. Based on this
information the PNEC aqua aliphatic derived was 0.001 mg/L. For C13
aliphatic compounds Petrotox v3.05 calculates an indicative HC5 of 0.001
mg/L. For C15 aromatic compounds Petrotox v3.05 calculates an indicative
HC5 of 0.002 mg/L. Soil and sediment PNECs were derived using the
aquatic PNEC and using the equilibrium partitioning method. The HC5
model states that it is expect that substances with a Log Kow higher
than 5 will not pose a toxicity hazard to other WWTP microbes due to
solubility and organism constraints, therefore only an aromatic STP PNEC
Ecotoxicology data are available for CAS
numbers 68478-10-4 and 68477-54-3. The studies showed similar results
across the three trophic levels. The fish studies provided a 96 hour
LL50 range between 0.73 – 6.3 mg/L WAF. The invertebrate studies
provided 48 hour EL50 range of 0.91 – 3.2 mg/L WAF. The algae studies
provided a 72 hour ErL50 range of 1.3-1.5 mg/L WAF. The aquatic hazard
assessment is currently under evaluation as part of the LOA
Environmnental Testing Program.
Ecotoxicity Labelling for Resin Oils and
Cyclic Dienes Category
Data on the acute aquatic toxicity of 5
members of this category have been read across to the other category
members. The studies were conducted to standard guidelines and according
to GLP and so are considered reliable for use as key studies. For some
of the studies, the authors report the LC50 based on nominal loading
rates (WAF) and mean measured concentrations. As the test substance is a
hydrocarbon stream with various components reporting a measured
concentration could be misleading as the measured concentration does not
relate to a concentration of the raw stream. Instead, we have used the
results reported as WAF, which better represent the potential toxicity
of the test substance. Similar sensitivities were shown in all three
WAF data can be used for comparison with the
criteria for environmental classification under both the DSD and CLP
Regulations. However, its use must be considered carefully. It is
considered that based on the available data (most conservative result:
96 hour LL50 for fish of 0.73 mg/L), streams in this category should
have the classification R50/53 under the DSD and Acute 1 Chronic 1 under
the CLP regulations.
The measured partition coefficients of three
streams in this category have log Pow ranges from 2.8 ->6.5. Therefore
the classifications cannot be removed.
Based on the available experimental data,
streams in this category should have the classification Acute 1 Chronic
1 under the CLP regulations.
However, the classification of streams in
this category may be impacted by other constituents. Components which
may impact the classification should be identified by the registrants
and the impact of their environmental classification included in the
assessment. The classification of each stream can be determined
following the equations given in the notes below.
Under the CLP Regulations
Acute 1 applies where: Acute 1 x M ≥ 25 %
Chronic 1 applies where: Chronic 1 × M ≥ 25
Chronic 2 applies where: (M × 10 × Chronic
1) + Chronic 2 ≥ 25 %
Chronic 3 applies where: (M × 100 × Chronic
1) + (10 × Chronic 2) + Chronic 3 ≥ 25 %
Chronic 4 applies where: Chronic 1 + Chronic
2 + Chronic 3 + Chronic 4 ≥ 25 %
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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