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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Administrative data

Link to relevant study record(s)

Description of key information

Acetic acid, C11-14-isoalkyl esters, C13-rich is a UVCB with a defined composition for which only the variation of percentage of each constituent is known. Therefore the mean percentage has been selected for each constituent. The chronic toxicity to daphnids has been investigated using an in-house calculation method that mimics an OECD 211 study and guideline for Testing of Chemicals No. 23 (i.e. WAF conditions). The chronic toxicity to daphni

was determined using a calculation method for Mode of Action of ester compounds for each individual constituent present in the mixture. This algorithm is based on a QSAR model which has been validated to be compliant with the OECD recommendations for QSAR modeling (OECD, 2004). Further to this, the effective loading rate of the WAF is determined by using a series of calculation steps using phase equilibrium thermodynamics first to determine the analysable fraction (the concentration which should be analysable in a WAF study) and then excluding the non-bioavailable fraction of the remaining constituents. The remaining, bioavailable fraction corresponds to the effective loading value of the mixture. The 21 -day NOEC based on daphnids reproduction was determined as greater than the water solubility limit defined in this in silico study, i.e. a loading rate of 2 mg test item/L.

Key value for chemical safety assessment

Additional information

Using a loading rate of 2 mg/L, i.e. at the maximal solubility of the UVCB in water, and after removal of the non-bioavailable fraction, the remaining solubilised fraction is not sufficient to exert any toxicity effect based daphnids reproduction. Therefore it is not possible to determine a 21d-NOEC below the water solubility limit of the WAF.