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Toxicity to aquatic algae and cyanobacteria

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Description of key information

EL50 (72 h) = 30 mg/L growth rate (Raphidocelis)
EL50 (72 h) = 10 mg/L biomass (Raphidocelis)
NOEL (72 h) = 3 mg/L growth rate (Raphidocelis)
NOEL (72 h) < 1 mg/L biomass (Raphidocelis)

Key value for chemical safety assessment

Additional information

Two studies conducted according to OECD 201 guideline are available on the toxicity to aquatic algae for hydrocarbons, C6-C7, n-alkanes, isoalkanes, cyclics, <5% n-hexane (Shell 1994, 1995). The toxicity, as measured by inhibition of growth rate and biomass to Raphidocelis, was evaluated in freshwater by using water accomodated fractions (WAFs). Under the conditions of these studies, the test substance, hydrocarbons, C6-C7, n-alkanes, isoalkanes, cyclics, < 5% n-hexane, produced toxicity to Raphidocelis at 30-100 mg/L (Shell 1995) and 55 mg/L (Shell 1994) measured as growth inhibition and 10-30 mg/L (Shell 1995) and 26 mg/L (Shell 1994) measured as inhibition to biomass based on nominal loadings of the test substance in water. NOELs were determined to be 3 mg/L (growth and biomass) (Shell 1995) and 30 mg/L (growth) and < 1 mg/L (biomass) (Shell 1994).