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Toxicity to aquatic algae and cyanobacteria

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Description of key information

Short-term toxicity of NExBTL renewable diesel (a UVCB substance of similar composition to the substance) toward an aquatic algae Scenedesmus subspicatus was determined in a GLP compliant laboratory according to OECD Guideline 201 (Alga, Growth Inhibition Test)". There was no statistical difference (Student's t-test, p < 0.05) in the growth between the control and the WAF test group. E*L50 > 100 mg/L.

Supporting PETROTOX (version 4.01) acute and chronic toxicity to aquatic algae values are available. The model predicted an LL50 of >1,000 and a EL10 of 2.67 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L

Additional information

PETROTOX 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.

PETROTOX predicted an LL50 of >1,000 and a EL10 of 2.67 mg/L.