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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Little or no biodegradation has been observed in screening tests of ready and inherent biodegradability.  

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Little or no biodegradation of the substance has been observed in the OECD screening tests of ready and inherent biodegradability or their equivalents. However, the key study conducted according to OECD 301F (The Dow Chemical Company, 2009) has shown the substance to be toxic or inhibitory to the activated sludge inoculum at a concentration of 30 mg/L. Therefore, the negative results of these screening tests may be due, in part, to inhibition of the microbial inocula by the relatively high concentrations of test substance employed.