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EC number: 212-757-6 | CAS number: 867-13-0
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
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
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