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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

The study does not need to be conducted because direct and indirect exposure of the soil compartment is unlikely (exposure considerations).

Key value for chemical safety assessment

Additional information

Non-submission justification

According to column 2 of Annex IX to Regulation (EC) No 1907/2006 (REACH) toxicity testing to terrestrial organisms does not need to be conducted if direct and indirect exposure of the soil compartment is unlikely. In compliance with the ECHA Guidance on Information Requirements and Chemical Safety Assessment, Chapter R.7c (ECHA, June 2017) forreadily biodegradable substances which are not directly applied to soil it is generally assumed that they will not enter the terrestrial environment and as such there is no need for testing of soil organisms.

 

The use of isobutyl acrylate as a monomer, almost exclusively in closed systems for the production of polymers, indicates that environmental exposure would be limited. The volatility of isobutyl acrylate provides for volatilization of any releases to the air. Sludge application to land from exposed STPs is not expected.

 

Further, there is no particular concern for soil according to column 2 of REACH Annex IX. The experimental log Pow of isobutyl acrylate was determined to be 2.38 (please refer to IUCLID section 4.7) indicating both that adsorption to soil and bioaccumulation is very unlikely. This conclusion is supported by the log Koc of 1.53 (Koc = 33.8) predicted for isobutyl acrylate. Hence, long-term exposure of terrestrial organisms is not to be expected.

 

Finally, the Chemical Safety Assessment according to Article 14 and Annex I of Regulation (EC) No 1907/2006 (REACH) did not indicate any need for further assessment of toxicity to sediment organisms. Therefore, generating additional data on toxicity to terrestrial organisms is considered scientifically not necessary. The PNEC sediment was thus estimated based on the equilibrium partitioning method.

 

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