Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

(Alkyl-dipropylene) triamines and (tripropylene) tetramines are pronated under ambient conditions. This means that they will sorb strongly to negatively charged substances like glassware, soil and sediment constituents. For three different soils Kd values were observed for C16 and C18' tri and tetraamines ranging from: 2.7 * 10^4 to 2.2 * 10^5 L/kg.

Biodegradation is considered to be the main removal mechanism of this substance. Most ready biodegradability tests are however hampered by the biocidal activity of these substances.

The half-life in the different environmental compartments will be strongly influenced by the bioavailability of the substances. No data are available for the determination of the half-life of triamines and tetramines in soil or sediment. These values are therefore estimated as a worst-case on the readily biodegradability of the available fraction and the sorption data as determined in a sorption desorption test.

 

DT50

Degradation in water:

15

Degradation in sea water:

50

Degradation in sediment:

30000

Degradation in soil:

30000

Triamines and tetramines have a short predicted half-life in air but because there are no important releases into the atmosphere and volatilisation is expected to be negligible, this removal mechanism is thought to be of low relevance

Triamines and Tetramines do not contain hydrolysable covalent bonds. Cleavage of a carbon-nitrogen bond under environmental conditions is only possible with a carbonyl group adjacent to the nitrogen atom. Degradation of triamine C16 -18 and tetramines C16 -18 through hydrolysis is therefore not considered.

Direct photolysis of triamines and tetraamines in air/water/soil will not occur, because it does not absorb UV radiation above 290 nm. Photo transformation in air/water/soil is therefore assumed to be negligible.

Standard OECD 305 tests are technically not feasible with these strongly sorbing degradable substances. In addition is the route of exposure in a standard OECD 305 test unrealistic for these substances because the substance will either be sorbed or biodegraded. The bioaccumulation potential of tri- and tetramine C16 -18 was therefore assessed based on a measured log Kow (OECD 123). Using this observed log Kow of -0.3 . A BCF of 3.162 L/kg ww is calculated using EPIweb v4.0. In vitro biotransformation by rainbow trout hepatic subcellulair fraction has been observed for primary alkyl amines and alkyl propane-1,3 -diamines. It is therefore likely that also alkyl dipropylene triamines and alkyl tripropylene tetramines are biotransformed.