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EC number: 263-061-4 | CAS number: 61789-45-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
No toxic effects up to the limit of water solubility
Key value for chemical safety assessment
Additional information
No study is available for fatty acids, dehydrated castor-oil (CAS 61789-45-5) as well as the main constituents of the blend (C18'' and C18'' conjugated). Therefore ecotoxicological effects are predicted from adequate and reliable data for source substance(s) by read-across to the target substance within the group applying the group concept in accordance with Annex XI, Item 1.5, of Regulation (EC) No 1907/2006.
Read-across is performed to a test conducted with oleic acid C18' (CAS 112-80-1). Furthermore, a supporting read across is performed to fatty acids, tall oil (CAS 61790 -12 -3), since the main components of this fatty acid mixture are also unsaturated C18 components (50-60% C18', 35-40% C18'').
The 72 h experiment provided by the Ministry of the Environment, Government of Japan (2002) was conducted according to OECD 201 under GLP conditions. Pseudokirchneriella subcapitata was tested in a limit test at a test concentration of 3.6 mg/L (nominal) corresponding to 2.6 mg/L (mean measured). The resulting ErC50 (72 h) and the NOErC (72 h) were > 3.6 mg/L (nominal) and 2.6 mg/L (mean measured), respectively . Thus, no toxic effects on aquatic algae were observed within the water solubility of the test substance.
The second study on toxicity to algae with fatty acids, tall oil was condcuted according to OECD 201 under GLP conditions (Pine Chemical Association, 2004). Pseudokirchnerella subcapitata was exposed to water accomodated fractions (WAF) of 125, 250, 500, 750 and 1000 mg/L (nominal). Only in the highest WAF an inhibition of growth rate < 50% was observed and an EL50 (72 h) of > 1000 mg/L and a NOELR (72 h) of 750 mg/L was stated.
Summarising the listed results the conclusion can be drawn that no toxicity effects on algae of fatty acids, dehydrated castor-oil are expected up to the limit of water solubility.
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