Hydrocarbons, C9-C10, aromatics, >1% naphthalene

Endpoint summary

Description of key information

There is no data available for this substance. However, key and supporting data is available for structural analogue Hydrocarbons, C9, Aromatic. The data is read across to this substance based on analogue read across and a discussion and report on the read across strategy is provided as an attachment in IUCLID Section 13.

The substances are 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.

Based on data available for this substance and structural analogues, this substance does demonstrate acute fish, acute invertebrate, algae toxicity at high loading rates.

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

Key information is summarazed below

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

The test was conducted to determine the acute aquatic toxicity of Hydrocarbons, C9, aromatics to the aquatic invertebrate Daphnia magna. Based on immobilization, the 48-hr EL₅₀for Daphnia magna is 3.2 mg/L (WAF).

 

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).