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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

With high probability acutely not harmful to aquatic algae. 

Key value for chemical safety assessment

Additional information

One valid study according to guideline methods is available.

In a 72-hour static test with the green alga Scenedesmus subspicatus according to OECD 201 the algae toxicity of caffeine was studied. The following nominal test substance concentrations were set up: 0, 6.25, 12.5, 20, 50 and 100 mg/L (4 replicates each). Concentrations were not verified analytically. Significant differences regarding growth rate and biomass integral were determined statistically. According to the statistical calculations the NOEC is 6.25 mg/L. The 72 hour EC50 was estimated to be >100 mg/L.