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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

In  standard guideline tests Hydroquinone proved to be readily biodegradable. Also under anaerobic conditions the substance is completely metabolized.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In studies conducted according to OECD Guideline 301C (MITI I), hydroquinone proved to be readily biodegradable, fulfilling the 14 d window criterion (70% biodegradation after 14 d). Under aerobic conditions, 1,4-benzoquinone, 2-hydroxy-1,4-benzoquinone, and β-ketoadipic acid were identified as metabolic intermediates, however at low concentrations.

Proposed metabolism pathway under anaerobic conditions: degradation via phenol, cyclohexanol, cyclohexanone to caproic and adipic acid which are further degraded to acetate, propionate, butyrate, CO2, H2and CH4.