Registration Dossier
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EC number: 922-114-8 | CAS number: -
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
NOELR (21d) = 4.888 mg/L (QSAR, read-across from hexane)
Key value for chemical safety assessment
Additional information
There are no data available on the chronic toxicity to invertebrates of hydrocarbons, C5-C6, n-alkanes, isoalkanes, <5% n-hexane. However, there are reliable data available considered suitable for read-across using the analogue approach.
The target substance is a hydrocarbon solvent with carbon numbers in the range of C5 to C6. The main constituents of the mixed solvent consist of about 43% of C6 species and about 57% of C5 species. n-Hexane is only present in concentrations < 5% of the total volume.
Taking into account all available data, animal and human toxicity data as well as environmental fate and effects data show that source substances have a similar (eco-)toxicological and environmental fate properties as the target substance.
Therefore, read-across is performed based on an analogue approach (for details please refer to the analogue justification which is attached in section 13 of the technical dossier).
For a number of analogue substances the aquatic toxicity was estimated by a QSAR, using the Petrotox computer model (v 3.04), which combines a partitioning model used to calculate the aqueous concentration of hydrocarbon components as a function of substance loading with the Target Lipid Model used to calculate acute and chronic toxicity of non-polar narcotic chemicals. Petrotox computes toxicity based on the summation of the aqueous-phase concentrations of hydrocarbon block(s) that represent a hydrocarbon substance and membrane-water partition coefficients K(MW) that describe the partitioning of the hydrocarbons between the water and organism. The estimated freshwater 21 days NOELR values based on reproduction are as follows:
Hydrocarbons, C6, isoalkanes, < 5% n-hexane: 7.138 mg/L (Concawe 2009)
Hexane: 4.888 mg/L (Concawe 2009)
Hydrocarbons, C5-C7, n-alkanes, isoalkanes, n-hexane rich: 5.195 mg/L (Concawe 2009)
Hydrocarbons, C6, n-alkanes, isoalkanes, cyclics, n-hexane rich: 5.224 mg/L (Concawe 2009)
Pentane: 10.76 mg/L (Concawe 2009)
QSARs resulted in NOELR values in a range of 4.888 mg/L - 10.76 mg/L. As key study the QSAR conducted for hexane was chosen demonstrating the most critical value with 4.888 mg/L.
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