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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

No effect up to the limit of the water solubility  was observed. Thus, the EC50  exceeds the water solubility of the test substance. The test substance is not harmful to algae.

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Additional information

No data are available for the toxicity of docosanamide (CAS No. 3061-75-4) towards aquatic algae. Therefore data from the analogue substance (Z) -docos-13-enamide (CAS No.112-84-5) and amides, C16-18 even numberedwere used as read across.

The influence of the test item (Z)-Docos-13-enamide on the growth of the freshwater green algal species Pseudokirchneriella subcapitata was investigated in a 72-hour static test according to OECD Guideline 201 (2006). The nominal concentrations of the test item of 4.6, 10, 22, 46 and 100 μg/L were tested. The highest test concentration of 100 μg/L lies clearly above the water solubility limit of the test item. The test item (Z)-Docos-13-enamide had no biologically relevant inhibitory effects on the algal growth (average growth rate and yield) up to the highest test concentration.

A second GLP guideline study according to OECD 201 is available for amides, C16-18 even numbered. In the 72 hour algae study with Desmodesmus subspicatus no effects on growth rate were observed to an initial measured test concentration of 0.17 mg/L, the highest attainable concentration. This study showed that there were no toxic effects at saturation. The test substance is not harmful to algae.