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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Ready result of short chained triamine with OECD closed bottle test and results of tetraamine + additional literature info to support this result

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

Oleyl tripropylene tetramine (C18tripropylene tetramine, composition of the Oleyl-alkyl chain is specified by Karleskind (1996)) is an alkyl polypropylene polyamine. Due to toxicity to microorganisms one valid ready biodegradability test result for alkyl polypropylene polyamines is available. Nevertheless all aspects important to show non persistence of Oleyl tripropylene tetramine (C18tripropylene tetramine) are available i.e. 1) ultimate (complete) biodegradation (demonstrated in (S)CAS tests and through read across) 2) high rates of degradation (through read across with Coco dipropylenetriamine (C18tripropylene tetramine)) and 3) occurrence of competent microorganisms in unacclimated ecosystems (through read across with Coco dipropylenetriamine (C18tripropylene tetramine) are fulfilled. Oleyl tripropylene tetramine (C18tripropylene tetramine is therefore at present viewed as not persistent.

Table Summary of degradation rate constants in various (eco)systems based the ready biodegradability of alkyl dipropylene triamines.

(Eco)system

Method

 

Surface water (fresh)

TGD default value

30 days half-life

Surface water (fresh) sediment

TGD default value

30000 days half-life

Marine water

TGD default value

50 days half-life

Marine water sediment

TGD default value

30000 days half-life

Soils

TGD default value

30000 days half-lifea

Degradation in sewage treatment plants

Determined in bioreactors

>99.8% removal primarily by biodegradation

a Determined in bioreactors >99.8% removal primarily by biodegradation a Half-life of the fraction dissolved in the water phase is expected to in the order of a few days.