Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

According to the key study (CIBA, 1986) the ready biodegradability of the test item was assessed over a 28 day period by the modified Sturm test (OECD 301B). The nominal test concentrations were 10 and 20 mg a.s./L. The test material attained up to 13 and 19 % biodegradation after 28 days whereas the positive control substance (Aniline) was 94.4 % degraded 28 days. These results indicate that the test item cannot be classified readily biodegradable under conditions of the test. In a supportive study (Ciba, 1986) the Chemical Oxygen Demand was determined. After an exposure of 2 h the amount of O2 was very low, indicating no degradation of the test item.

In accordance with column 2 of REACH Annex VIII, biodegradation in water and sediment and biodegradation in soil does not need to be conducted. However, further biotic degradation testing shall be proposed if the chemical safety assessment according to Annex I indicates the need to investigate further degradation of the substance and its degradation products. The test substance was found to be poorly biodegradable in an OECD 301B study. It is assumed that the results of simulation studies would not reveal any different findings. Therefore, simulation studies on surface water and sediments as well as in soil are not provided.