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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The toxic effect of the test item L-phenylalanine to algae was assessed in a growth inhibition test. L-Phenylalanine was found not to inhibit the growth of the freshwater green alga Desmodesmus subspicatus after 72 hours. The NOEC-value of the test item for both inhibition of growth rate and inhibition of yield after 72 hours was 100 mg/L. The EC50-values of the test item for both inhibition of growth rate (ErC50) and yield (EyC50) after 72 hours were > 100 mg/L.

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
100 mg/L
EC10, LC10 or NOEC for freshwater algae:
100 mg/L

Additional information

The toxic effect of the test item L-phenylalanine to algae was assessed in a CLP guideline growth inhibition study. In this study L-Phenylalanine was found not to inhibit the growth of the freshwater green alga Desmodesmus subspicatus after 72 hours. The NOEC-value of the test item for both inhibition of growth rate and inhibition of yield after 72 hours was 100 mg/L. The EC50-values of the test item for both inhibition of growth rate (ErC50) and yield (EyC50) after 72 hours were > 100 mg/L. A slight stimulation on the growth rate and a significant stimulation on the yield were observed.

All effect level are given based on the nominal limit concentration of the test item L-Phenylalanine.