Registration Dossier
Registration Dossier
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EC number: 800-362-7 | CAS number: 1307863-78-0
Endpoint summary
Administrative data
Description of key information
Additional information
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) is a salt of N-C16-C18-alkyl-(evennumbered, C18 unsaturated) propane-1,3-diamine and di[(9Z)-octadec-9 -enoate (synonymous with N-(tallow alkyl)-1,3 -propanediamine and oleic acid respectively). The basic structure of the N-C16-C18-alkyl-(evennumbered, C18 unsaturated) propane-1,3-diamine consists of a hydrocarbon chain with a 1,3 -propanediaminegroup at the end of the chain which form ion bonds with [(9Z)-octadec-9-enoate consisting of a hydrocarbon chain with an acid group at the end of the chain. The substance has almost no surface active properties in this form.
Fate
In the environment the substance will end up in sludge, and possibly in soil and sediments. However, the substance is biodegradable so the fraction going to sludge, soil and sediment is expected to be low. A CAS test confirmed that 99.4% of the substance will be removed from the waste water (95.3% removal via biodegradation and 4.1% removal via sorption).
Abiotic degradation
Atmospheric degradation rates were estimated with AOPwin. According to AOP calculations the reaction with OH-radicals in air would result in a half-life time in air in the order of 20 minutes, while the half-life time in air for the reaction with ozone was predicted to be in the order of 20 – 30 minutes. A hydrolysis test has been waived because the substance is readily biodegradable in accordance with column 2 of Annex VIII of Regulation 1907/2006/EC.
Biodegradation
In a ready biodegradation study according to OECD TG 301D (GLP, reliability 1) > 60% biodegradation was found after 28 days. The study demonstrates that the substance is readily biodegradable. In a Continuous Activated Sludge (CAS) study according to OECD TG 303A (GLP, reliability 1) 99.4% removal was observed after 56 days at the end of the test. Chemical analysis confirmed that 95.3% removal occurred via biodegradation and 4.1% via sorption to sludge. The studies demonstrate that complete biodegradation occurs in biological waste water treatment plants.
Bioaccummulation
The substance is expected to have a low bioaccumulation potential because of the large molecular weight (MW > 800) and the very high log Kow (log Kow = 32, EPIWIN estimate). This is confirmed by the BCF of 70.8 L/kg wetweight estimated with EPIWIN. Moreover aquatic exposure will be very limited as the substance will be removed > 99.4 % from the waste water as demonstrated in a CAS test.
Transport and distribution
The adsorption coefficient (Kd) of the substance has been determined to be in the range of 19686 – 37961 L/kg for three different soils in a test according to OECD TG 106, indicating a high sorption potential. The mean Kd of 30068 L/kg has been used for the derivation of other Kd values. The Henry’s Law Constant was 168 Pa m3 / mol at 12 °C calculated from the vapour pressure and water solubility.
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