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Only a few valid ready biodegradability test results for N,N,N’,N’,N’’-pentamethyl-N-C16-18 (even numbered) C18 unsat.-alkyl-1,3-propanediammonium chloride are available because this substance is very toxic to micro-organisms. N,N,N’,N’,N’’-pentamethyl-N-C16-18 (even numbered) C18 unsat.-alkyl-1,3-propanediammonium chloride tested in the presence of silica gel was biodegraded 28% at day 28 in the Closed Bottle test indicating partial degradation. Other data prove that the alkyl chain of N,N,N’,N’,N’’-pentamethyl-N-C16-18 (even numbered) C18 unsat.-alkyl-1,3-propanediammonium chloride is readily converted into water-soluble non-toxic nitrogen containing substances. These biodegradation products are persistent in OECD 301 (ready biodegradability) and 302 (inherent biodegradability) tests. This means that the half-life for the intermediate in all environmental comparts can be set to ∞ as a worst-case.

 

 

Table Summary of degradation rate constants of the parent compound N,N,N’,N’,N’’-pentamethyl-N-C16-18 (even numbered) C18 unsat.-alkyl-1,3-propanediammonium chloridein various (eco)systems.

(Eco)system

Method

 

Surface water (fresh)

TGD default value

15 days half-life

Surface water (fresh) sediment

TGD default value

30000 days half-lifea

Marine water

TGD default value

50 days half-life

Marine water sediment

TGD default value

30000 days half-lifea

Soils

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 be in the order of a few days.

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