Registration Dossier
Registration Dossier
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EC number: 451-900-9 | CAS number: 894406-76-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Several studies are available assessing the ready biodegradability potential of Didecyldimethylammonium carbonate and the chemical analog Didecyldimethylammonium chloride. In the key study according to OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test) the biodegradability of Didecyldimethylammonium carbonate was determined with a non-adapted activated sludge over a test period of 28 days in the Modified Sturm Test. The 10 % level (beginning of biodegradation) was reached after 11 days and the pass level of 60 % after 19 days. The mean biodegradation came to 96 % after 28 days. The results were confirmed in a supporting study reaching the pass-level within the 10-day window and with a biodegradation rate of 99 % after 28-days.
Additional evidence on the ready biodegradation was obtained in studies using the chemical analog Didecyldimethylammonium chloride (DDAC) in a read-across approach. All studies revealed ready biodegradation not only in activated sludge, but also when exposed to unacclimated microorganisms obtained from a receiving system representative of a site where these test substances may be expected to be discharged. A study using 14C-radiolabelled substance revealed that 14CO2 production and disappearance of parent (primary biodegradation) were most accurately described by the 2 compartment function kinetic analysis.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
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