Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Etherdiamines/acetates are pronated under ambient conditions. This means that they will sorb strongly to negatively charges substances like glassware, soil and sediment constituents. For three different soils Kd values were observed ranging from: 940 to 2590 L/kg. Biodegradation is considered to be the main removal mechanism of this substance.

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

 

DT50

Degradation in water:

150

Degradation in sea water:

500

Degradation in sediment:

300000

Degradation in soil:

300000

Etherdiamines 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

Etherdiamines 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 etherdiamines through hydrolysis is therefore not considered.

Direct photolysis of etherdiamines 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 an standard OECD 305 test unrealistic for these substances because the substance will either be sorbed or biodegraded. The bioaccumulation potential of etherdiamines was therefore assessed based on a measured log Kow of -0.4. This log Kow is measured using the slow -stirring test according to OECD 123 and indicates that etherdiamine has a low bioaccumulation potential. The low Log Kow is confirmed by the relatively high observed CMC of 1.3 g/L.