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EC number: 800-362-7 | CAS number: 1307863-78-0
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The test substance was biodegraded by 65% at day 28 in a ready biodegradation test according to OECD TG 301D (GLP, reliability 1) and can therefore be classified as readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
A ready biodegradation test result is available for N-C16-C18-alkyl-(evennumbered, C18 unsaturated) propane-1,3-diaminium di[(9Z)-octadec-9-enoate] (CAS No. 1307863-78-0; old CAS No. 61791-53-5).
The test was performed according to the OECD TG 301D under GLP with acceptable (minor) deviations, meeting all validity criteria. Deviations included omission of ammonium chloride from the medium to prevent oxygen consumption due to nitrification (did not result in nitrogen limitation as shown by the biodegradation of the reference compound). Furthermore, activated sludge was used as inoculum.
The substance was biodegraded for 65% after 28 days. The 10-day window criterion was not fulfilled. The reasons for failing the 10-day window are the composition of the test substance. N-C16-C18-alkyl-(evennumbered, C18 unsaturated) propane-1,3-diaminium di[(9Z)-octadec-9-enoate] is a salt of N-(tallow-alkyl)-1,3-propanediamine and oleic acid and N-(tallow-alkyl)-1,3-propanediamine is a chemical consisting of a hydrophilic group linked to a hydrophobic moiety. In ready biodegradability tests, the two moieties of this fatty amine derivative are degraded sequentially by different micro-organisms. The time window criterion was developed for pure substances on the assumption that a compound is degraded by a single organism according to a sigmoidal growth curve in ready biodegradation tests. The degradation curve of N-(tallow-alkyl)-1,3-propanediamine oleates is the sum of the growth curves of oleate and the two moieties of N-(tallow-alkyl)-1,3-propanediamine. The biodegradability of oleate and the two moieties N-(tallow-alkyl)-1,3 -propanediamine in
the Closed Bottle test may be fully in line with the time-day window criterion when judged as separate chemicals, but this is not recognizable in the overall results of the ready biodegradation of the substance. The time-window should therefore be ignored as a pass or fail criterion for N-(tallow-alkyl)-1,3-propanediamine oleates. N-(tallow-alkyl)-1,3 -propanediamine oleates are therefore classified as readily biodegradable based on the biodegradation percentage of 65% at day 28.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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