Registration Dossier
Registration Dossier
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EC number: 918-668-5 | CAS number: 128601-23-0
Endpoint summary
Administrative data
Description of key information
There is data available for this substance.
The substance is poorly soluble and made of constituents with various water solubility. As a consequence, the exposures were performed with Water Accommodated Fractions (WAFs). Therefore, the results are based on nominal loadings.
The ecotoxicity of this substance has been examined in a series of studies on fish, Daphnia and algae, as well as in microorganisms and birds. Petrotox has been run on Hydrocarbons C9, aromatics for several species.
Additionally, a study conducted with microorganisms demonstrated no significant toxicity (EC50 >99 mg/L) of hydrocarbons, C9 aromatics, indicating that there would not be inhibition or toxicity to sewage treatment plant microorganisms.
According to the harmonised CLP legislation (2008), Annex VI, this substance is classified for the environment as aquatic chronic category 2 with the hazard statement H411: Toxic to aquatic life with long lasting effects.
Additional information
Short-term Fish Toxicity
Water accommodated fractions of hydrocarbons, C9 aromatics, produced a 96-hour LL50 value of 9.2 mg/L with rainbow trout, Oncorhynchus mykiss.
Long-term Fish Toxicity
The aquatic toxicity was estimated using the PETROTOX computer model (v4.0), 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 nonpolar 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 partitioning coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.
Short-term Invertebrate Toxicity
This test was conducted to determine the acute aquatic toxicity of Hydrocarbons, C9, aromatics to the aquatic invertebrate Daphnia magna. The 48-hr EL50 for Daphnia magna is 3.2 mg/L (WAF).
The acute toxicity of C9 aromatics hydrocarbons as measured by immobility to the water flea (Daphnia magna) was evaluated in freshwater.
Long-term Invertebrate Toxicity
The aquatic toxicity was estimated using the PETROTOX computer model (v4.0), 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 nonpolar 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 partitioning coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.
Toxicity to aquatic algae and cyanobacteria
C9 aromatic hydrocarbons produced toxicity based on inhibition of growth rate at 2.9 to ≥7.9, and reduction in biomass of Pseudokirchneriella subcapitata (formerly Selenastrum capricornutum) at a range of 2.6 to ≥3.8 mg/L, based on nominal loading of the test substance in water.
Microorganisms Toxicity
Hydrocarbons, C9, Aromatics is not expected to be toxic to aerobic sewage treatment. The NOEC is > 99 mg/l (nominal). The EC50 is also > 99 mg/l (nominal).
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