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Environmental fate & pathways

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Biodegradation of Sika Hardener LG was assessed in a closed bottle test over a period of 28 days according to EU-method C.4 -E and OECD guideline 301 D. The reference item Sodium benzoate was sufficiently degraded to a mean of 76.7 % after 14 days, and to a mean of 91.7 % after 28 days of incubation, based on ThODNH4, thus confirming the suitability of the used activated sludge inoculum. In the toxicity control containing both, the test item and the reference item, a mean of 49.7 % biodegradation was noted within 14 days and 55.7 % biodegradation after 28 days of incubation. Under the test conditions the percentage biodegradation of Sika Hardener LG reached a mean of 61.2 % after 28 days based on the ThODNO3. The pass level, 60 % of ThODNO3 was not reached within the 10-day window. Therefore the test item was considered ready biodegradable, but failing the 10-day window. This can be explained by a two step process, with hydrolytical cleavage resulting in amine and alhehyde component and biodegradation thereoff.