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 from1.0 (higest molecular homolgue) to 1.8 hours (lowest molecular homologue) (West, 2010).

 

Hydrolysis

The hydrolysis behaviour of Benzenediamine, ar-methyl-, polymer with 2-methyloxirane and oxirane was investigated at pH = 4, 7 and 9 using a HPLC/MS methods for analysis. Diaminotoluene, ethoxylated and propoxylated, as an NLP, contains different molecular weight fractions (= NLP-fraction) which behave similar in hydrolysis reaction. Benzenediamine, ar-methyl-, polymer with 2-methyloxirane and oxirane is found to be stable at 50°C with less than 10 % dissipation in 5 days at all three pH-values. Therefore, it can be assumed that the test item is also stable at 25°C and no half-life times and hydrolysis rates were calculated (Currenta, 2009).

 

Biodegradation

There is one study (Currenta, 2009) that assessed ready biodegradability within 28 days and gave a degradation of 27 % for Benzenediamine, ar-methyl-, polymer with 2-methyloxirane and oxirane. Thus, the substance is not considered to be readily biodegradable" (Currenta, 2009). Furthermore, there is a study (Currenta, 2009) that assessed inherent biodegradability within 27 days, giving a degradation of 42% for Benzenediamine, ar-methyl-, polymer with 2-methyloxirane and oxirane. Thus, the substance is, furthermore, not considered to be inherently biodegradable.

 

Biodegradation in water and sediment

In accordance with column 2 of REACH Annex IX, degradation simulation testing in soil does not need to be conducted. The substance is used exclusively in manufacture of polymers/elastomers, where it is completely reacted into these products; and as a result will have no direct or indirect exposures to the soil environment. 

 

Biodegradation in soil

In accordance with column 2 of REACH Annex IX, degradation simulation testing in soil does not need to be conducted. The substance is used exclusively in manufacture of polymers/elastomers, where it is completely reacted into these products; and as a result will have no direct or indirect exposures to the soil environment. 

 

Bioaccumulation: aquatic / sediment

In accordance with column 2 of REACH Annex IX, the bioaccumulation test on fish does not need to be conducted as the substance has a low potential for bioaccumulation (log Kow3). 

 

Adsorption / desorption

The estimated Koc values for homologous components of this UVCB substance is in the range of 10 to 491 L/kg for the lowest (least sorptive) and highest (most sorptive) molecular weight homologues which gives a log Koc range of 1 to 2.7. The components of this UVCB substance can be regarded as having low affinity for adsorption to soils and activated sludge biosolids (West, 2010).