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Environmental fate & pathways

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Description of key information

Two guideline studies, investigated the ready biodegradability of the substance are available. Both studies concluded that the substance cannot be considered to be readily biodegradable.

Additional information

The following information is available for the biodegradation endpoint:

Beimborn, 2000, was selected as the key study as it was considered the most reliable study according to the criteria set out by Klimisch, 1997.

The Beimborn, 2000, study is a Manometric Respirometry Test performed according to Annex of EEC-Directive 92/69 and corresponds to OCED Guideline 301 F and ISO Standard 948. The test was performed at 22±1ºC with a concentration of 50 mg/l. The inoculum was collected 12 days before the study initiation from the municipal waste water treatment plant of Mannheim, 1 day before the study initiation the inoculum was supplimented with sludge from the waste water treatment plant of the testing laboratory in order to obtain a concentration of 30 mg/l dry solids.

The test produced the following results:

Biodegradation degree (BOD of ThOD) after 28 days: 30 -40%

Biodegradation degree (BOD of ThOD) after 39 days: 50 -60%

Based upon these results the registered substance is considered to be not readily biodegradable (according to OCED criteria).

The Baumann, 1992, study is presented as supporting information only. The percentage biodegradation results of the study were as follows: 11.7 mg test substance/1 = 40% in 28 days and 22.7 mg test substance/1 = 28% in 28 days. Based upon these results it is considered that the substance does not meet the EU criteria for classification as a readily biodegradable substance.