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Short-term toxicity to aquatic invertebrates

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Description of key information

Key value for chemical safety assessment

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Information on short term toxicity to aquatic invertebrates was unavailable for other gas oils, however suitable read across information from vacuum gas oils, hydrocracked gas oils and distillate fuels is available. The 48 h EL50 for Daphnia was 68 mg/L. This data is from Shell report 6304 (1996). This is the most conservative value from the two key studies. This study is reliable (2) it is a GLP compliant, guideline study, no restrictions, fully adequate for assessment.

A wide range of values have been reported for the supporting studies, they have not been considered for use as key studies because insufficient information was supplied to determine whether they meet the validity criteria of the test methods.

This endpoint has been filled by read-across of measured data from another category. It is supported in a weight of evidence approach by a calculated value using composition information derived from two dimensional gas chromatography in conjunction with the PETROTOX model. The calculated LL50 is 7.385 mg/L.

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 freshwater invertebrate 48-hr EL50 value is 7.385 mg/L.