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Ecotoxicological information

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Description of key information

Assessment of aquatic toxicity.

Additional information

Since the physico-chemical properties of the polyol esters are similar, it is expected that the compounds will behave in the same way in the aquatic environment. Based on the above considerations, it can be concluded that the eco-toxicological properties of decanoic acid, mixed esters with heptanoic acid, octanoic acid and trimethylolpropane can be derived directly by read-across from known esters.

 

Acute toxicity to fish: LL50/LC50 > 10000 mg/L and LC50 > 1000 mg/l (based on read-across to CAS 11138-60-6, CAS 91050 -89 -4 and CAS 78 -16 -0), i.e. >> water solubility of decanoic acid, mixed esters with heptanoic acid, octanoic acid and trimethylolpropane.

Acute toxicity to aquatic invertebrates: EL50 (48 h) > 100 mg/L WAF loading rate(based on read-across to CAS 11138-60-6), i.e. >> water solubility ofdecanoic acid, mixed esters with heptanoic acid, octanoic acid and trimethylolpropane.

Long-term toxicity to aquatic invertebrates: A 15-day reproduction test with read-across substance, decanoic acid, ester with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol octanoate, showed no effects in the range of water solubility with an NOELR = 2570 mg/L (15 d) based on reproduction and immobilisation, i.e. >> water solubility of decanoic acid, mixed esters with heptanoic acid, octanoic acid and trimethylolpropane. A further study is currently in progress to assess this endpoint.

Study on substance itself: Decanoic acid, mixed esters with heptanoic acid, octanoic acid, and trimethylolpropane - Full Life-Cycle Toxicity Test with Water Fleas, Daphnia magna, Under Static-Renewal Conditions. The exposure was performed under static-renewal conditions for a period of 21 days.  Results of this study were used to determine the No-Observed-Effect Concentration (NOEC) and Lowest Observed-Effect Concentration (LOEC) for the most sensitive biological parameter monitored (e.g., daphnid survival, reproduction, and total body length).  In addition, a median effective concentration (EC50), EC20, and EC10 values for survival, reproduction, and growth (total body length) were determined.  The results of this study are based on nominal loading rate WAF and mean measured concentrations of Hatcol 1510.

Based on the results of this study, the 21 day No-Observed-Effect Concentration (NOEC) and Lowest-Observed-Effect Concentration (LOEC) for all endpoints were determined to be 100 mg/L and >100 mg/L, respectively, based on nominal loading rate WAF concentrations.  

The 21 day No-Observed-Effect Concentration (NOEC) and Lowest-Observed-Effect Concentration (LOEC) for all endpoints were determined to be 0.00085 mg/L and >0.00085 mg/L, respectively, based on mean measured concentrations , indicating that there were no effects at the limit of solubility in water.  

Acute toxicity to aquatic plants (algae): An algae toxicity study was conducted with read-across substance, decanoic acid, ester with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol octanoate provided an ErL50 > 100 mg/L (WAF loading rate), i.e. >> water solubility of decanoic acid, mixed esters with heptanoic acid, octanoic acid and trimethylolpropane.

Toxicity to aquatic microorganisms: A study was conducted with CAS 11138 -60 -6 using activated sludge (domestic). No inhibition of respiration was observed. Therefore, the EC50 and EC10 (3h) values are > 10000 mg/L (nominal), i.e. >> water solubility of decanoic acid, mixed esters with heptanoic acid, octanoic acid and trimethylolpropane.

A report justifying the read-across approach is included in IUCLID Chapter 13.