Registration Dossier
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EC number: 603-931-6 | CAS number: 135800-37-2
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
No effects on toxicity to aquatic algae up to the limit of water solubility.
Key value for chemical safety assessment
Additional information
In general, all EC/EL50(72 h) values derived with different algae species for various test substances in the SCAE C2 -C8 category were above the limit of water solubility. Physical effects caused by the test substance were described in presence of undissolved test material.
Two studies were available on the toxicity to aquatic algae with Fatty acids, C8 -16, 2-ethylhexyl esters.
The key study with Scendesmus subspicatus was performed according to EU-Method C.3 with filtered and unfiltered solution of 100 mg/L (Wierich 1998). The filtered solution showed no significant inhibition of algae growth or growth rate which means that the water soluble part of the test substance turned out not to be toxic. With a more or less homogenous emulsion of test material high inhibitions of algae growth and growth rate were observed (75.7% and 42.6% respectively). This observed inhibition in presence of undissolved test substance can be accounted to physical, but not biological influences and a ErC50(72 h) of > 100 mg/L could be stated.
As supporting study the marine algae Skeletonema costatum was tested according to ISO 10253 using a WAF. The resulting ErL50(72 h) was determined as 535.6 mg/L (nominal loading rate, Gibson 1999).
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