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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 effect of trizinc dicitrate when in solution is not expected to differ significantly from the effects of the citrate anion (H7C6O7-) and the metal ion separately, so exposure will be to citric acid and the metal ions separately. Therefore the ready biodegradation of Trizinc dicitrate is assessed based on available read across data from citric acid and zinc. 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. The available data on citric acid is thus sufficient to fulfil the information requirements for this endpoint.

Trizinc dicitrate is also found to be readily biodegradable by bacteria from available supporting study after a lag time of 20 hours.