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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The study of Eisner (2013) was considered as the key study and demonstrated in a CO2 evolution (Modified Sturm) test that lanthanum acetate (the organic part) is readily biodegradable, passing the 10-d time window criterium. The inorganic part of the molecule (lanthanum) is not biodegradable and biodegradability testing is not relevant for inorganics. Therefore, the endpoint is sufficiently covered by this study.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

One key study (Klimisch 1) was identified on the ready biodegradability of lanthanum acetate (Eisner, 2013). In this study, the ready biodegradability of the substance was investigated in a CO2 evolution (Modified Sturm) test according to OECD guideline 301B. Lanthanum acetate was found to be biodegradable by 77% under the test conditions within the 28-d exposure period, passing the 10-d time window criterium. The substance is concluded to be readily biodegradable, passing the 10-d time window criterium (pass level = 60%).

It should be noted that the measured biodegradation (CO2 evolution) is due to biodegradation of the acetate part of the molecule. The inorganic part of the molecule (lanthanum) is not biodegradable and biodegradability testing is not relevant for inorganics. The endpoint has therefore been sufficiently covered.