Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Phototransformation in air

Estimated half-lives for the components of this UVCB substance range from 1.0 to 1.8 hours.

 

Hydrolysis

Ether bonds are stable and do not hydrolyse to a significant extent at environmental relevant condition. This has been confirmed in an OECD 111 study with the structurally related substance Diaminotoluene, ethoxylated and propoxylated (CAS# 67800-94-6) in which the substance was stable at pH 4, 7, 9 at 50 degrees Celsius during 120 hours (Bayer Material Science AG, 2009).

 

Biodegradation

Biodegradation in water was tested in two screening studies according to OECD 301F (ready biodegradability) and OECD 302B (inherent biodegradability). Diaminotoluene, propoxylated showed 23% biodegradability in the first test (Bayer, 2002) and 9% biodegradability in the second test (ISOPA, 2003) . In the OECD302B test, 22% degradation was observed after 27 days. The substance is classified as "not ready biodegradable". The substance exhibits inherent (primary) biodegradability, and therefore is not expected to persist indefinitely in the environment.

 

Bioaccumulation

With a log Kow ≤3, the substance can be considered to have a low potential for bioaccumulation.

 

Adsorption/desorption

In accordance with Column 2 of REACH Annex IX, the study does not need to be conducted as the substance can be expected to have a low potential for sorption (log Kow ≤3). The estimated Koc values for homologous components of this UVCB substance range from 16 to 491 L/kg for the lowest (least sorptive) and highest (most sorptive) molecular weight homologues. The components of this UVCB substance can be regarded as having low affinity for adsorption to soils and activated sludge biosolids.