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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

SIKA Hardener LI was assessed in a closed bottle test over a period of 28 days, according to OECD guideline 301 D and the EU method C.4-E. SIKA Hardener LI was ready biodegradable, reaching a mean of 63.4 % after 28 days, however, degradation failed the 10-day window.
Data from the hydrolysis products indicate that 2,2-Dimethyl-3-lauroyloxy-propanal is readily biodegradable, whereas 3-aminomethyl-3,5,5-trimethylcyclohexylamine is not readily biodegradable (see ECHA dissemination webpage).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable but failing 10-day window

Additional information

In a weight of evidence approach the biodegradation data form the parent molecule and the two primary hydrolysis products were assessed:

The parent substance SIKA Hardener LI was assessed in a closed bottle test over a period of 28 days, according to OECD guideline 301 D and EU method C.4-E. Under the test conditions biodegradation of SIKA Hardener LI reached a mean of 63.4 % after 28 days, based on ThODNO3. However the pass level of 60 % was not reached within a 10-day period. Therefore, the test item was considered ready biodegradable failing the 10 day window. The correspondingdegradation rate was calculated to be 7.70Eā€‘06 d-1or 3.210Eā€‘07 h.

The hydrolysis product 2,2 -Dimethyl-3 -lauroyloxy-propanal was tested using a test item concentration corresponding to 20 mg organic carbon/L (nominal) in test medium following OECD 301B and EU-Guideline C.4-C. Aniline was chosen as reference item. Activated sludge was used as inoculum (concentration in the test 25 mg drymatter/L). The test was left running for 28 days. All validity criteria were met. Degradation of the reference item was 75 % after seven days. The degradation of test item at end of the test was 91 %. Therefore the test item was considered to be readily biodegradable.

The second hydrolysis product Isophorone diamine (CAS 2855 -13 -2) proved to be not readily biodegradable in a study conducted according to EU method C4 A (8 % degradation after 28 d, see ECHA dissemination webpage).