Registration Dossier
Registration Dossier
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EC number: 952-252-4 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
The registered substance is Alkyl phosphate and stearyl amine salts (EC = 952-252-4), a Multi-constituent. It is mainly composed by primary alkylamines (CAS 90640-32-7, UVCB), Monoalkyl dihydrogenophosphate and Dialkyl hydrogenophosphate salts (CAS 39471-52-8, Multi-Constituent). This different chemical structures are constituted by saturated and variable chain lenght with C16 and C18.
The registered substance, the Amines, C16-18 (even numbered)-alkyl , salts with phosphoric acid, mono- and di-C16-18 (even numbered) alkyl esters (EC = 952-252-4) is considered insoluble and not readily biodegradable according to both key studies OECD 105 and OECD 301F.
If no data are available on a salt, effects may be read-across from the anion or cation, whichever has the most toxic effect (according REACH guidance document R7b v4, June 2017 p81). It was considered that environmental fate and ecotoxicity of the registered substance as driven by properties of the dissociated alkylammonium part.
A key adsorption/desorption study on the primary alkyl amines is available according TG OECD 106 and GLP. The sorption behaviour of the registered salt is dominated by ionic interactions rather than hydrophobic partitioning with organic matter. The alkyl ammonium cations present under environmental conditions demonstrates a high adsorption potential, and can interact with the surfaces of mineral particles or with negatively charged humic substances.
Primary alkyl amines are unlikely to undergo photolytical or hydrolytic degradation. Thus abiotic degradation in the environment is not expected.
The simulation test according to TG OECD 309 is waived due to the high insolubility of the registered multi-constituant.
An OECD 307 aerobic soil transformation study (3 soils) was carried out with [1-14C]-Hexadecanamine (Harlan, 2010). Although this C16 amine is strongly sorbing to soil (median Kpsoil of 3875 L/kg at lowest measured concentration) half-lives between 8.1 and 9 days at 20 degree C were determined. The median Half-life of 8.9 d at 20 degree C corresponds to a median Half-life of 16.9 d at an environmental temperature of 12 degree C (see REACH Guidance). No other simulation tests for degradation rates under environmental conditions are available.
For aerobic sediments, based on the result of the study on aerobic transformation in soil and in line with the REACH Guidance R16. (2016) A.16 -3.2.2, a DT50 freshwater sediment (aerobic) of 16.9 d at 12 deg. C would be assigned (value equal to half-life in soil). In the table below, the degradation rates used the exposure assessment are summarized :
Table:Degradation rates used in the exposure assessment:
k | DT50 |
|
kdegfreshwater | 4.62.10-2d-1 | 15 d |
kdegseawater | 1.39.10-2d-1 | 50 d |
kbiosed(aerobic) | 4.10.10 -2d-1 | 16.9 d |
kbiosed(bulk) | 4.10.10 -3d-1 | 169 d |
kbiosoil | 4.10.10 -2d-1 | 16.9 d |
kdegair | 2.22d-1 | 7.5 h |
N-Primary alkyl amines are rapidly metabolised not only by microorganisms but also by other biota like fish.
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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