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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

OECD 301B (CO2 evolution Test): 97% in 28 days, OECD 301E (Modified OECD screening test): 100% in 19 days, OECD 302B (Inherent biodegradability: Zahn-Wellens test): 85% in 14 days

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

The ready biodegradation of Trisodium citrate is determined based on available read across data from citric acid. The substance will dissociate when in solution to the citrate anion ( (H7C6O7-) and the metal ion (Na+), so exposure will be to the citrate and the metal ions separately. The available data is thus sufficient to fulfil the information requirements for this endpoint. The substance is considered readily biodegradable.

However, the ready biodegradability of the metal ion does not need to be determined in accordance with Column 2 of REACH Annex VII, since it is inorganic.