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EC number: 800-362-7 | CAS number: 1307863-78-0
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
The results of a CAS test (OECD 303A, GLP, reliability 1) demonstrate that the test substance is removed by 99.4% from the waste water in conventional biological waste water treatment plants. Chemical analysis of the test substance confirmed that removal occurred for 95.3% via biodegradation and for 4.1% via sorption to sludge.
In accordance with column 2 (9.2.1.2) of REACH (Regulation 1907/2006/EC) Annex IX, simulation testing on biodegradation in water and sediment is not needed as the substance is readily biodegradable.
Key value for chemical safety assessment
Additional information
A continuous activated sludge (CAS) study simulating biological plants treating domestic wastewater was performed according to OECD TG 303A (GLP, reliability 1). The test was performed with hydrogenated tallow-1,3-diaminopropane (CAS No. 68603-64-5) and these results have been read-across to N-(tallow alkyl )-1,3,propanediamine oleates (CAS No. 1307863-78-0). The test substance consists of hydrocarbon chains with a 1,3-diaminopropane group at the end of the chain. The predominant hydrocarbon chains are C18 (67%) and C16 (31%). The registered substance consists of hydrocarbon chains with a 1,3 –diaminopropane group at the end of the chain which form ion bonds with (9Z)-octadec-9-enoate consisting of hydrocarbon chains with an acid group at the end of the chain and with similar hydrocarbon chain lengths.
Read-across is justified because the components of the tested and registered substances are very similar and will have no influence on the biodegradability: C16-C18 hydrocarbon chains with a 1,3 diaminopropane at the end of the chain for the test substance versus C16-C18 hydrocarbon chains with a 1,3 diaminopropane at the end of the chainandC16-C18 hydrocarbon chains with an acid structure at the end of the chain for the registered substance.
The continuous activated sludge (CAS) unit was fed with domestic wastewater spiked with 50 mg/L hydrogenated tallow-1,3-diaminopropane (CAS No. 68603-64-5). Removal percentages of approximately 100% were immediately achieved. These removal percentages were calculated using non purgeable organic carbon (NPOC) analysis. At the end of the test, 99.4% removal was determined using specific chemical analysis (LC-MS/MS). Only 4.1% (3.4 – 4.7) of hydrogenated tallow-1,3-diaminopropane was removed by adsorption onto the sludge. These results demonstrate that the substance will be removed primarily by biodegradation (mineralization).
In accordance with column 2 (9.2.1.2) of REACH (Regulation 1907/2006/EC) Annex IX, simulation testing on biodegradation in water and sediment is not needed as the substance is readily biodegradable.
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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