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Only one valid ready biodegradability test result foralkyl dipropylene triaminesis available because these substances are very toxic to micro-organisms. Nevertheless all aspects important for achieving a ready biodegradability test result i.e. 1) ultimate (complete) biodegradation (demonstrated in (S)CAS tests, through read across with triamine C12 -18 and intermediates) 2) high rates of degradation (through read across with triamine C12 -18) and 3) occurrence of competent micro-organisms in unacclimated ecosystems (through read across with triamine C12 -18) are fulfilled. All (alkyl dipropylene) triamines should therefore be classified as readily biodegradable (Table). 


Table Typical members of the family of (alkyl dipropylene) triamines.

Chemical name


triamine C16 -18

1219458 -14 -6

triamine C12 -18

1219458 -12 -4

triamine octodecenyl


branched triamine C12


branched triamine C16 -18

1219826 -66-0



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




Surface water (fresh)

TGD default value

15 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


TGD default value

30000 days half-lifea

Degradation in sewage treatment plants

Determined in bioreactors

>99.9% removal primarily by biodegradation

aHalf-life of the fraction dissolved in the water phase is expected to in the order of a few days.