Registration Dossier

Environmental fate & pathways

Biodegradation in soil

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Description of key information

The degradation half-life aerobic soil from the read across substance Hexadecanamine, CAS No. 143-27-1 was used (see read across justification below).

Key value for chemical safety assessment

Half-life in soil:
17 d
at the temperature of:
12 °C

Additional information

For the registration substance no Aerobic transformation test in soil according OECD 307 is available and therefore the result from a similar substance is used instead.

Read across substance:

Hexadecanamine (HDA), CAS No. 143-27-1, is a component of C16-18-(even numbered)-alkylamines with the REACH Reg.No. 01 -2119473799 -015 -0000

Read across justification:

The registration substance Bis(2-hydroxyethyl) C12-18 alkylamine N-oxide (BANO) is similar to the read across substance HDA as both have a long chain alkyl amine moiety. BANO has an amine oxide function whereas HDA is an amine. It is known that alkylamine N-oxides can be easily reduced to the alkyl amines (and vice versa) and therefore the inherent properties of each other can be used for read across (Reference; Crabbe et al, Microbial oxidation of amines, Bioachem. J. 1974, 140, 253-263; Barrett & Kwan, Bacterial reduction of trimethylamine oxide, Ann. Rev. Microbiol., 1985, 39, 131-149). BANO and HDA differ in the chain length as BANO is mostly C12/14 whereas BAO is C16 Both substances are cationic surfactant which means that the sorption properties are mainly determined by ionic interactions and to a lesser extent by unspecific van der Waal forces. Therefore the sorption properties of BANO can be deduced from the Kd values of HDA or homologues e.g. Octadecylamine reasonably. According to the REACH Guidance Document R.7b the half-life of a substance in aerobic soil can be deduced from the biodegradation in a screening test on ready biodegradability and the sorption properties. BONA and HDA are both readily biodegradable and as they have similar sorption properties the result from an OECD 307 Aerobic soil transformation test of HDA can be used reasonably for read across to BONA.