Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Target substance can be considered to be neither rapidly nor inherently biodegradable.

Additional information

Biodegradability of FAT 20063 has been evaluated in a number of studies.

The inherent biodegradability of FAT 20063/C was determined in a modified Zahn-Wellens Test according to the OECD Guideline 302B, in compliance with GLP. The test substance FAT 20063/C and the reference substance Diethylenglycol, respectively, were tested in concentrations of 150 mg/l DOC. The adsorption of the test substance after 3 hours was estimated to be 1 %. The biodegradation of the test substance FAT 20063/C after 28 days was 0 %. Hence, the total elimination of the test substance over the whole test period of 28 days was 1 %. The biodegradation of the reference substance after 7 days was estimated to be 98 %. Based on the findings of the study, it can be concluded that the test substance did not show any biodegradation under the test conditions.

In two different GLP studies conducted in 1994, the BOD5 of FAT 20063/C was determined to be 4 mg 02/g, while the COD was 744 mg O2/g, giving a BOD5/COD ratio of 0.05. Hence the substance can be considered to be not rapidly biodegradable.

 

In two supporting studies conducted in 1975, the BOD5 for FAT 20063/A was estimated to be 230 mg O2/g, while the COD was determined to be 906 mg O2/g, giving a BOD5/COD ratio of 0.25. Hence the substance can be considered to be not rapidly biodegradable.

 

The BOD5 for the test substance FAT 20063/B was estimated to be 0 mg O2/g, while the COD was determined to be 424 mg O2/g, giving a BOD5/COD ratio of 0 (1981). Hence the substance can be considered to be not rapidly biodegradable.

Based on the above results, the target substance can be considered to be neither rapidly nor inherently biodegradable.