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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Description of key information

The substance is not biodegradable. Significant elimination from water by adsorption onto activated sludge in biological effluent treatment plants is however possible.

Key value for chemical safety assessment

Additional information

Three studies on the biodegradation potential of the substance are available.

In the first study the biodegradation potential of the substance in water was determined in a screening study according to OECD TG 301B (CO2 -Evolution Test) and in compliance with GLP criteria (BASF, draft report). In this study ca. 49 mg/L test substance was inoculated with activated sludge from a municipal sewage plant for 28 days under aerobic conditions in the dark. During the incubation period degradation was followed by determining the carbon dioxide produced. After the 28 -day incubation period less than 10% of the test substance was biodegraded. Based on these findings, the test substance is classified as not readily biodegradable.

The second study is a biodegradation screening test according to OECD 302B (Zahn-Wellens/EMPA Test) in which a nominal concentration of 1 mg/L test substance was inoculated with activated sludge from a communal sewage treatment plant (BASF, 1996). The test was terminated after 3 hours as at that time ca. 40% of test substance was lost from the test solution which was concluded to be due to adsorption to the activated sludge.

The third study is also a biodegradation screening study according to OECD 302B (BASF, 1989). In this study a nominal test concentration of 144 mg/L (as DOC) was inoculated for 33 days. No further details on inoculum or test conditions are given. The substance is reported to have degraded 45% at the final test day. Without further detail however, a significant part of the 45% degradation should be assumed to be due to adsorption to activated sludge.

Based on the available data the substance is assessed to be not biodegradable.