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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The environmental fate of naphthenic acids, zinc salts, basic in the environment is most accurately evaluated by separately assessing the fate of its constituents zinc cations and naphthenate anions. The concept of biodegradation is not applicable to zinc cations since metals are not biodegradable. The removal from the water column was modelled referring to the EUSES model parameters and different conditions of pH. Zinc is removed by > 70% under the reference conditions for the EU regional waters (EUSES) and considered as equivalent to being "rapidly degradable” regarding the chronic aquatic hazard classification.

Naphthenic acids can be considered to be readily biodegradable.

A supporting degradation study according to OECD 301B guideline (CO2 evolution) for naphthenic acids, zinc salts, basic indicates 28.8% degradation of naphthenate after 28 days. Since information critical for the assessment is missing, results cannot be considered conclusive or reliable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed
Type of water:

Additional information