Registration Dossier
Registration Dossier
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EC number: 309-870-9 | CAS number: 101316-66-9 A complex combination of hydrocarbons obtained during the sorptions of toluene from a hydrocarbon fraction from cracked gasoline treated with hydrogen in the presence of a catalyst. It consists predominantly of hydrocarbons having carbon numbers predominantly in the range of C6 through C8 and boiling in the range of approximately 80°C to 135°C (176°F to 275°F).
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Experimental data provided for this Category was generated via use of WAFs. Deriving PNEC’s for UVCB substances based on WAF information is inappropriate. PNECs were derived using the PETROTOX v.3.05 model.The hydrocarbon block method is used for environmental risk assessment (see REACH guidance, R7, app.13-1). PNECs for hydrocarbon blocks have been derived using the HC5 statistical extrapolation method and the target lipid model using representative structures. See Product Library tab in PETRORISK spreadsheet (Table B.3). Given the large database of organisms included in the target lipid model, an assessment factor of one has been applied to the HC5.
Conclusion on classification
Environmental classification justification
Tested streams
Some ecotoxicology studies are available for 68476-55-1 (Hydrocarbons, C5-rich). The most sensitive endpoint was a 48 hour EL50 for aquatic invertebrates of 6.96mg/l WAF. No other stream toxicity data has been submitted.
Ecotoxicity Labelling for Low Benzene Naphthas
Data on the acute aquatic toxicity of one member of this category (68476-55-1) was obtained from a proprietary source. No data was identified in the published literature. The data from this stream has been read across to the other category members.
The studies were conducted to standard guidelines and according to GLP and so are considered fully reliable for use as key studies. The authors report the LC50 based both 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. Algae were found to be less sensitive than either invertebrates or fish which had similar sensitivity to the test substance (EL50 6.96 mg/l WAF and LC50 14.1 mg/l WAF respectively).
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. Based on the available data (48 hour EC50 6.96mg/l WAF) streams in this category should have the classification R51/53 under the DSD and Chronic 2 under the CLP regulations.
The measured partition coefficients of three streams in this category have log Kow ranges from 2.8 to 6.5. Therefore, the classifications cannot be removed.
Conclusion
Based on the available experimental data (48 hour EC50 6.96mg/l WAF) streams in this category should have the classification R51/53 under the DSD and Chronic 2 under the CLP regulations
However, the classification of streams in this category may be impacted by other constituents. Components which may impact the classification (i.e. those that are R50/53) 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.
Note:
Under the DSD
R50/53 applies if sum of components with R50/53 is >25%.
R51/53 applies if sum of components with R51/53 is >25% or if sum of components with R50/53 is >2.5%.
R52/53 applies if sum of components with R52/53 is >25% or if sum of components with R51/53 is >2.5% or if sum of components with R50/53 is >0.25%.
Under the CLP Regulations
Acute 1 applies if sum of components with acute 1 is >25%.
Chronic 1 applies if sum of components with chronic 1 is >25%.
Chronic 2 applies if sum of components with chronic 1 multiplied by 10 plus the sum of components with chronic 2 is >25%.
Chronic 3 applies if sum of components with chronic 1 multiplied by 100 plus the sum of components with chronic 2 multiplied by 10 plus the sum of components with chronic 3 is >25%.
Chronic 4 applies is sum of components with chronic 1, 2, 3 and 4 is >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.
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