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Toxicity to microorganisms

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Reference
Endpoint:
activated sludge respiration inhibition testing
Type of information:
(Q)SAR
Adequacy of study:
key study
Study period:
Not applicable, calculated value
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Remarks:
This summary has a reliability of 2 because the results are estimated using a computer model that is appropriate for use with this hydrocarbon substance.
Justification for type of information:
QSAR prediction: see Petrorisk Assessment Report.
Qualifier:
no guideline followed
Principles of method if other than guideline:
The aquatic toxicity was estimated by a QSAR, the Petrotox computer model (PETROTOX-UDM_ver3.01-2006-01438-01-E). 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
Vehicle:
no
Test organisms (species):
other: Tetrahymena elliotti
Test type:
other: QSAR modeled data
Water media type:
freshwater
Limit test:
no
Total exposure duration:
48 h
Duration:
48 h
Dose descriptor:
other: EL50
Effect conc.:
> 1 000 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth inhibition
Validity criteria fulfilled:
yes
Conclusions:
The hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics, estimated protozoan, Tetrahymena elliotti, 48-hr EL50 value is >1000 mg/L based on growth inhibition.
Executive summary:

The aquatic toxicity was estimated using the Petrotox computer model (PETROTOX-UDM_ver3.01-2006-01438-01-E), 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 (KMW) that describe the partitioning of the hydrocarbons between the water and organism. The hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics, estimated protozoan, Tetrahymena elliotti, 48-hr EL50 value is >1000 mg/L based on growth inhibition.

Description of key information

The Hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics, estimated protozoan, Tetrahymena elliotti, 48-hr EL50 value is >1000 mg/L based on growth inhibition.

Key value for chemical safety assessment

Additional information

The Hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics, estimated protozoan 48-hr EL50 value is >1000 mg/L based on growth inhibition of Tetrahymena elliotti.