Registration Dossier
Registration Dossier
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EC number: 931-700-2 | CAS number: 66455-29-6
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The substance is readily biodegradable
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
There a several biodegradation studies available for alkyl dimethyl betaines.
Betaines, C12-14 (even numbered)-alkyldimethyl (EC No. 931-700-2) was tested in a CO2 Evolution Test according to OECD guideline 301B and shows a biodegradation rate between 63-79 % after 28 days (Clariant, 2004). The substance is readily biodegradable according to OECD criteria.
Other guideline studies investigating the ready biodegradability of CAS No.683-10-13 and CAS No. 68424-94-2 are available. The biodegradation of these substances was tested in a CO2 Evolution Test according to OECD guideline 301B using domestic activated sludge as inoculum. The degradation of the test items was 95.6% for CAS No.683-10-13 and 77.8 % for CAS No. 68424-94-2 within 28 days (after acidification), respectively. Therefore, the test items reached the criterion for ready biodegradability. The achievement of these percentages of surfactant removal under the stringent conditions of the biodegradation test carried out allows to classify these amphoteric surfactants as “readily biodegradable” compounds and, therefore, to assume that they will be easily mineralized in aerobic aquatic environments. Further test results from Garcia (2008), Huntsmann (1978) and Clariant (2004) as well as an EU Ring test (2000) approve the results.
All these results illustrate that alkyl dimethyl betaines are readily biodegradable.
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