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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Ready biodegradation: 27% in 28 days: Not readily biodegradable
Inherent Biodegradation (Zahn Wellens test): Not inherent biodegradable

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Ready biodegradation

The biodegradation of TEPA at an initial concentration of 10 mg carbon/L (23.3 mg 4 -TBC/L) was studied according to OECD guideline301B.

Inoculum used in the test was an activated sludge at a concentration of 30 mg/L suspended solid taking in an aeration basin of a sewage treatment plant of domestic effluents. The percentage of biodegradation was estimated by the following parameter: CO2evolution . The percentage of biodegradation obtained after 28 days was27%.

Under the test conditions, TEPA is therefore considered as not readily biodegradable.



Inherent biodegradation

The inherent biodegradability of triethyl phosphono acetate (TEPA) (initial concentration: 233.3 mg/L), was tested in a Zahn-Wellens test during 28 days, according to OECD guideline for Testing of Chemicals n°302B (1992).

Inoculum used in the study was 300 mg/L of a activated sewage sludge from a wastewater treatment plant.

The percentage of biodegradation was estimated by following the DOC removal.

-TEPA did not adsorb on activated sludge.

-TEPA attained 30% degradation after 28 days

Under the test conditions,TEPA is therefore considered as not inherent biodegradable