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EC number: 246-807-3
CAS number: 25307-17-9
Based on the available studies on biodegradation, the substances are estimated to be readily biodegradable. The 10-days-window criterion should not be evaluated for a UVCB thus there is no requirement for performing a soil biodegradation test (Annex IX. 126.96.36.199). No simulation tests for degradation rates under environmental conditions are available for primary fatty amine ethoxylates but for a very similar substance (hexadecyl amine) and these results will be used for read-across to primary fatty amine ethoxylates (2EO). For soil and aerobic sediment this is a half-life value of 17 days at 12 °C.
For the derivation of the default half-life’s
the bioavailability is taken into account via the sorption properties of
the substance. This is realistic for soluble non-toxic substances. For
poorly soluble/strongly sorbing substances however, the degradation rate
in a standard ready test is limited by the dissolution rate and in many
cases not 60% degradation is achieved within 28 days but in a slightly
longer time frame. Such a substance is in fact completely degraded to CO2and
H2O and thus completely biodegradable. The bioavailable
fraction is readily biodegradable but the due to the stringency of the
test setup the substance this cannot be observed.
The Kpsoil was determined as 4526 L/kg. The
suggested maximum half-life for a readily degradable substance with a
Kpsoil in the range >1000 and < 10000 L/kg is 3000 days for soil (at 12
ºC). These values are considered as extremely conservative but in the
absence of measured data can be used in the exposure assessment as a
worst-case. The half-life of the bioavailable fraction of primary fatty
amine ethoxylates in the water phase of soils is expected to be in the
order of a few days, which is based on experiments with
dialkyldimethylammonium salts (van Ginkel et al, 2003).
Read across from primary alkyl amines
a substance which isvery similar to
2,2'-(C12-18 evennumbered alkyl imino) diethanol (CAS no 71786-60-2)
there is an OECD
307 aerobic soil transformation study available and the results of this
study will be used for read across to the primary alkyl amine
ethoxylates for both the soil and sediment compartment. Although this
C16 amine is strongly sorbing to soil (median Kp soil of 3875 L/kg at
lowest measured concentration) the following half-life’s at 20 °C were
determined for three soils: Soil 1 t1/2 = 9.0 d; Soil 2 t1/2 = 8.1 d;
Soil 3 t1/2 = 8.9 d.
The median Half-life of
8.9 d at 20 °C corresponds to a median Half-life of 16.9 d at an
environmental temperature of 12 °C (see REACH Guidance). This study
demonstrates that 1-Hexadecanamine (C16 amine) is rapidly degraded in
various soils and that the assumption of low degradation rates for
strongly sorbing substances could be unjustified.
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.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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