Amines, C12-14-alkyl

Endpoint summary

Additional information

Primary alkyl amines released into the atmosphere are likely to be degraded by reaction with hydroxyl radicals, with a half-life around 7.5 h.Because there are no important releases into the atmosphere and volatilisation is expected to be negligible, this removal mechanism is considered not to be relevant.

Primary alkyl amines are unlikely to undergo photolytical or hydrolytic degradation. Thus abiotic degradation in the environment is not expected.

Based on the available studies on biodegradation, the substances are estimated to be readily biodegradable, fulfilling the 10-days-window criterion. No simulation tests for degradation rates under environmental conditions are available, therefore for the aquatic environment the default values suggested by the REACH Guidance are used. For soil and sediments, the REACH Guidance approach was applied as well, taking into account that degradation in these compartments is inhibited by adsorption. In the table below, the degradation rates used for the preliminary 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)	2.31^.10^-3d^-1	300 d^1)
kbiosed(bulk)	2.31^.10^-4d^-1	3000d^1)
kbiosoil	2.31^.10^-3d^-1	300 d^1)
kdegair	2.22d^-1	7.5 h

                                   ¹⁾Worst worst case assumption, will be revised if 1-HDA OECD 307 results are available

N-Primary alkyl amines are rapidly metabolised not only by microorganisms but also by other biota like fish.