Registration Dossier
Registration Dossier
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EC number: 941-570-9 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Aquatic toxicty tests with Reaction mass of 2-butylheptanoic acid and 2-ethylnonanoic acid and 2-methyldecanoic acid and 2-propyloctanoic acid are not available.
The short-term toxicity of the similar substance Reaction mass of n-undecanoic-acid and 2-methyl-decanoic-acid and 2-ethyl-nonanoic-acid and 2-propyl-octanoic-acid and 2-butyl-heptanoic-acid was assessed in two main trophic levels of fresh water organisms (invertebrates and algae). For Daphnia, a 48h-EC50 of 16 mg/l (95% confidence interval between 13 and 19 mg/l) was obtained. In the respective study with a fresh water algae, Reaction mass of n-undecanoic-acid and 2-methyl-decanoic-acid and 2-ethyl-nonanoic-acid and 2-propyl-octanoic-acid and 2-butyl-heptanoic-acid inhibited growth rate and yield significantly at a time weighted average concentration of 4.2 mg/L and higher, resulting in an NOErC (72h) of 1.3 mg/L. The EC50 for growth rate inhibition (72h-ErC50) was 13 mg/L (95% confidence interval ranging from 11 to 15 mg/l). The estimated ErC10 (72h) was 2.7 mg/L (95% confidence interval between 2.0 and 3.5 mg/l).In a supporting short term toxicity study to invertebrates with the analogue substance 2-butyloctanoic acid, the 48h-EC50 to Daphnia magna was found to be 31 mg/l (95% confidence interval between 22 and 42 mg/l).
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