Registration Dossier
Registration Dossier
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EC number: 937-237-2 | CAS number: 1370006-50-0
Endpoint summary
Administrative data
Description of key information
Additional information
In a static test according to DIN 38412, Part 25, partially unsaturated IQAC, DMS quaternised proved to be inherently biodegradable, > 90 % based on reduction of COD after 28 d.
Although, partially unsaturated IQAC, DMS quaternised proved to be not readily biodegradable (0% degradation after 28 d) in one study, further reliable tests of partially unsaturated IQAC, DMS quaternised on ready biodegradability underline that the substance to be registered is inherently biodegradable.
The differences between the results for hydrolysis and biodegradation rates may be due to the test design. In the study for hydrolysis of the closely related homologue oleic-acid based IQAC, DMS quaternised was dissolved in acetonitrile to prepare the stock solutions and then the test solutions were prepared by adding small amounts of the stock solution to the test solution. By this procedure the test item might have been more dispersed and therefore more susceptible for hydrolysis than in the biodegradation studies, where dispersions in water were used. The only difference to IQAC based on Oleic-acid, DMS quaternised is the source of the fatty acid moiety resulting in slight differences in number and position of the C=C double bonds.
However, from the studies on hydrolysis and biodegradation it can be concluded that partially unsaturated IQAC, DMS quaternised is susceptible to hydrolysis and biodegradation and will not persist in the environment. The above results are confirmed by a study conducted similar to OECD Guideline 303 A (Simulation Test - Aerobic Sewage Treatment. A: Activated Sludge Units), partially unsaturated IQAC, DMS quaternised was eliminated for > 90% in a modified activated sludge unit. The effluent of the laboratory scale activated sludge unit was used for long-term ecotoxicological tests with Daphnia magna and algae. The degradation capacity of the sludge units was kept high and the nitrification of the sludge unit was therefore > 95%. The ammonium concentration was < 2 mg/L in the effluent.
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