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Ecotoxicological information

Short-term toxicity to fish

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Reference
Endpoint:
short-term toxicity to fish
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: This summary has a reliability of 2 because the results are estimated using a computer model that is appropriate for use with this petroleum substance.
Justification for type of information:
Petrotox is a well documented and peer reviewed model that is widely used across the petrochemicals industry. This substance fits within the criteria of the model and there are no reservations about the validity of the model runs. It is expected that this data is reliable with restrictions.
Qualifier:
no guideline followed
Principles of method if other than guideline:
The aquatic toxicity was estimated by a QSAR, the PETROTOX computer model (version 3_06). This model combines a partitioning model used to calculate the aqueous concentration of hydrocarbon components 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 (KMW) that describe the partitioning of the hydrocarbons between the water and organism.
GLP compliance:
no
Remarks:
The data were calculated by a computer model
Analytical monitoring:
not required
Test organisms (species):
Oncorhynchus mykiss (previous name: Salmo gairdneri)
Test type:
other: QSAR modelled data
Water media type:
freshwater
Limit test:
no
Total exposure duration:
96 h
Key result
Duration:
96 h
Dose descriptor:
LL50
Effect conc.:
1.1 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
mortality
Remarks on result:
other: QSAR calculation
Conclusions:
The estimated 96-hr LL50 value for Onchorhynchus mykiss, is 1.1 mg/L.
Executive summary:

The aquatic toxicity was estimated using the PETROTOX computer model, 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 petroleum substance and membrane water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.

The estimated 96-hr LL50 value for Onchorhynchus mykiss, is 1.1 mg/L.

Description of key information

The aquatic toxicity was estimated using the PETROTOX computer model, 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 petroleum substance and membrane water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.

The estimated 96-hr LL50 value for Onchorhynchus mykiss, is 1.1 mg/L.

Supporting data on Toluene and Ethylbenzene, two constituents in Category J were used to support the QSAR prediction. Experiemental 96 -hour LC50s of 5.5 and 8.4 mg/L (for toluene and ethylbenzene, respectively) have been reported.

Key value for chemical safety assessment

LC50 for freshwater fish:
1.1 mg/L

Additional information