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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The biodegradability of OTNE was tested in a Modified MITI test (OECD TG 301C). The validity criteria for the test were met. The concentration of the test substance added was 100 mg/l, with an activated sludge concentration of 30 mg/l suspended solids. The mean percentage biodegradation found was 0% based on BOD and 11% based on analysed test material concentration. In conclusion, OTNE was not readily biodegradable under the conditions of this test.

Key value for chemical safety assessment

Biodegradation in water:
not biodegradable

Additional information

Besides this key study, another ready biodegradability test according to OECD TG 301F is available.

The Ready Biodegradability of OTNE was determined by the Manometric Respirometry Test according to the OECD Guidelines for Testing of Chemicals, Method No. 301 F. The concentration tested was 100 mg/l OTNE, with an activated sludge concentration of 30 mg/l. In the conditions of the test, OTNE undergoes no biodegradation, even after 42 days. Thus, OTNE should be regarded as not readily biodegradable according to this test (Rudio, 1995a).

Also the inherent biodegradability of OTNE was determined by the Modified MITI Test (II) according to the OECD Guidelines for Testing of Chemicals, Method No. 302 C. The concentration tested was 30 mg/L OTNE, with an activated sludge concentration of 100 mg/L. OTNE undergoes no biodegradation and should be regarded as not inherently biodegradable according to this test (Rudio, 1995b).

Under the conditions of these studies OTNE is not readily biodegradable and not inherently biodegradable.