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EC number: 696-364-9
CAS number: 133779-11-0
screening tests are available for various structurally related
alkyl-1,3-diaminopropanes under consideration consist of carbon,
hydrogen and nitrogen only. The basic structure of all
alkyl-1,3-diaminopropanes consists of a hydrocarbon chain with a
1,3-propanediamine group at the end of the chain. The only difference
consists of differing chain lengths and slight variations in the degree
of saturation in the alkyl chain. Since the majority of the alkyl chains
consist of C12to C18units, and the unsaturated
part is mainly located in the more central part of the alkyl chain,
significant changes in chemical behavior and/or reactivity is not to be
expected. Therefore the experimental data available for this group of
alkyl-1,3 -diamines are used for the evaluation of the biodegradability
of N-C12 -14–propane-1,3-diamine.
the available studies on biodegradation, all alkyl 1,3 -diaminopropanes
(C10 - C18) are considered to be readily biodegradable. The
10-days-window criterion does not need to be evaluated as the alkyl 1,3
-diaminopropanes are UVCB substances. No simulation tests for
degradation rates under environmental conditions are available,
therefore the default values suggested in the REACH guidance may be
used. Because of the observed ready biodegradability there is no
requirement for performing a soil biodegradation test (Annex IX.
a soil biodegradation test is performed with the structurally related14C
hexadecyl amine. The observed
half-life of 14C hexadecylamine of 8.98
days at 20 °C as determined according to an OECD 307 test is used for
read-across to the diamines as both the primary alkyl amines and
diamines are structurally related, readily biodegradable and have a
similar sorption to soil. This means that for the risk assessment a
half-life for soil and sediment of 17 d at 12°C are considered realistic
A waste water treatment
simulation test was performed with amines, N-C16-18-alkyl
(even-numbered) propane-1,3-diamine (133779-11-0). 99.4% removal was
observed using specific chemical analyses (LCMS/MS) of the effluent
during day 56 to 60 (n=5). In addition, sorption
to sludge was measured and this accounted for 4.1% of the total removal
which means that 95.3% was removed by biodegradation.
table of degradation rate constants in various (eco) systems based on
the ready biodegradability of alkyl-1,3-diaminopropanes:
Surface water (fresh)
TGD default value for readily biodegradable substances
Surface water (fresh) sediment
Read across from half-life hexadecylamine
TGD default value for readily biodegradabl substances
Degradation in sewage treatment plants
Determined in STP simulation test
99.4% removal primarily by biodegradation
of the fraction dissolved in the water phase is expected to in the order
of a few days.
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