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Environmental fate & pathways

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Biodegradation

Biodegradation in water: screening test (Weight of Evidence approach)

2-Propenoic acid, C16-18-alkyl esters (read across)

In the Ready Biodegradability (CO2-Evolution) Test the degree of biodegradation of the test substance at the end of exposure was determined to be 50-60 % CO2/ThCO2.

 

Dodecyl acrylate (C12) (read across)

The degree of biodegradation of the test substance was 80-90 %CO2/ThCO2 after an exposure period of 28 days.The read across substance (mixture of CAS no. 2156-97-0 and 21643-42-5) is readily biodegradable under the conditions of this test.

 

Icosyl acrylate (C20) (read across)

The degree of biodegradation of the test substance was 60-70 %CO2/ThCO2 after an exposure period of 60 days.The test item was biodegradable under the enhanced test conditions of this test.

 

Conclusion

Considering the results of the biodegradation studies with Dodecyl acrylate/ Laurylacrylate (C12), 2-Propenoic acid, C16-18-alkyl esters and Icosyl acrylate/ Behenylacrylate (C20) a Weight of Evidence approach was made.

Taking all data together, 2-Propenoic acid, icosyl ester is considered to be biodegradable under the enhanced test conditions.

 

Biodegradation in water and sediment

In accordance with column 2 of REACH Regulation (EC) No 1907/2006, Annex IX, section 9.2.1.2 and 9.2.1.4, no study on biodegradation in water and sediment needs to be conducted if the test substance is readily biodegradable (but failing the 10 - day window) under test conditions. 2-Propenoic acid, icosyl ester is biodegradable under the enhanced test conditons. Thus no further biodegradation testing in water and sediment is required.

 

Biodegradation in soil

In accordance with column 2 of REACH Regulation (EC) No 1907/2006, Annex IX, section 9.2.1.3, no study on biodegradation in soil needs to be conducted if the test substance is readily biodegradable (but failing the 10 - day window) under test conditions. 2-Propenoic acid, docosyl ester is biodegradable under the enhenced test conditions. Thus no further biodegradation testing in soil is required.