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Toxicity to aquatic algae and cyanobacteria

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Description of key information

No acute or chronic effects to algae are expected up to the limit of water solubility (< 0.37 mg/L)

Key value for chemical safety assessment

Additional information

One static study with the marine alga Skeletonema costatum conducted according to ISO 10253 is available for Fatty acids, C18-unsaturated, trimers (CAS No. 68937-90-6). Due to the low water solubility of the test substance, the test solutions were prepared as water accommodated fractions (WAF). Within the 72 hours test period at a 1000 mg/L WAF loading rate no inhibition effects on the growth rate up to the limit of the water solubility of the test substance were observed (Källqvist, 2004). The EC50 for the marine environment is greater than the water solubility of the test substance (< 0.37 mg/L, detection limit). The EC10 was also concluded to be greater than the water solubility (< 0.37 mg/L) for the marine environment.

As no freshwater study is available for Fatty acids, C18-unsaturated, trimers (CAS No. 68937-90-6) in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5, grouping of substance and read across approach, a read-across approach to another structurally related category member Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4) is conducted. The aquatic toxicity to the green alga, Pseudokirchneriella subcapitata (formerly Selenastrum capricornutum) was tested with WAFs under static conditions (Kelly, 2002). The WAFs were prepared through direct addition of test substance to a stirring medium and stirred for 48h. Thereafter 800 mL of the WAF was siphoned off for use as a test medium. The EL50 (72 h) and NOELR (72 h) were both determined as > 1000 mg/L (nominal).

Thus, based on the above mentioned results, it can be concluded that Fatty acids, C18-unsaturated, trimers (CAS No. 68937-90-6) or any other substance within the category does not show any acute or chronic toxicity to algae up to the limit of water solubility.