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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Under test conditions no biodegradation was observed.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The substance has been tested by three screening studies (BOD5, COD) and one study of inherent biodegradation.

In a key study performed in 1987 the biochemical oxygen demand of FAT 36002 is determined by measuring the dissolved oxygen concentration before and after 5 days incubation at 20 °C in different test concentrations diluted in water saturated with dissolved oxygen that contains a seed of microorganisms. The BOD5 of FAT 36002 was found to be 63 mg/gr O2.

In another key study performed in 1987 the chemical oxygen demand of FAT 40284 is determined by measuring the dissolved oxygen concentration before and after 5 days incubation at 20 °C in different test concentrations diluted in water saturated with dissolved oxygen that contains a seed of microorganisms. The COD of FAT 40284 is 1135 mg O2/g test mat.

The relevant BOD5/COD quotient is <0.5, therefore the substance is not indicative of rapid degradation.

Further this evaluation is supported by the study of inherent biodegradation conducted according the guideline OECD 302B. The mixture is the same of two first screening studies. After 28 days of test period 36 % biodegradation was recorded indicating the test substance not biodegradable.