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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72-hour NOEC for growth rate was found to be 8.7 mg/L and the ErC50 was found to be 740 mg/L

Key value for chemical safety assessment

EC50 for freshwater algae:
740 mg/L
EC10 or NOEC for freshwater algae:
8.7 mg/L

Additional information

An OECD 201 algal inhibition test was conducted with the test substance sodium isobutyrate solution. The test was static with a test period of 72 hours. Pseudokirchneriella subcapitata cultures were exposed to the test substance at nominal test concentrations of 8.7, 22.5, 55.4, 138, 346, and 865 mg/L. Six replicates were used for the controls and three for the test solutions. Test vessels were 250 mL glass E-bottles with 100mL of solution, incubated on a shaking-table with approximately 100 µE m-2 s-1 continuous illumination and a temperature of 21-24 ±2oC. The total incubation period was 72 hours with sampling at 0, 24, 48, and 72 hours.

The 72-hour NOEC for growth rate was determined to be 8.7 mg/L, while the ErC50 was determined to be 740 mg/L.

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