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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Link to relevant study record(s)

Description of key information

NOEC aquatic invertebrates: no effects within water solubility. 

Key value for chemical safety assessment

Additional information

Since no study for the long-term toxicity to aquatic invertebrates is available, read across from palmitic acid (C16), which is a member of the fatty acids category, was done.

The study provided from the Ministry of the Environment, Government of Japan, conducted by an unknown author in 2008 was accomplished according to OECD 211 and GLP. The limit test on the toxicity of 98.7% pure palmitic acid to Daphnia magna lasted 21d and the long-term effects on the adult daphnids led to a LC50 (21d) of > 0.22 mg/L . For reproduction the NOEC (21d) resulted in >0.22 mg/L (measured) or >0.51 mg/L (nominal). No long-term toxic effects on invertebrates within water solubility were observed.

These results for palmitic acid (C16) are applicable to stearic acid, since the water solubility declines with chain length and toxicity of the fatty acid substances declines likewise with chain-length starting with C12. Thus, no long-term toxicity on aquatic invertebrates is to be expected from stearic acid.